2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-11-17 22:50:15 +01:00
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2007-07-03 01:55:03 -04:00
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2007-09-04 23:45:01 -04:00
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2008-01-17 12:01:18 -05:00
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2007-10-22 00:59:47 -04:00
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2009-07-07 22:07:59 -07:00
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2009-11-23 08:38:16 -08:00
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2010-02-04 00:17:18 -08:00
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2011-11-04 23:56:05 -07:00
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2012-03-04 10:41:36 -08:00
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2006-03-29 22:41:07 +02:00
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2007-10-22 00:59:47 -04:00
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2006-03-29 22:41:07 +02:00
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2006-11-17 22:50:15 +01:00
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2006-03-29 22:41:07 +02:00
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2006-06-13 10:04:34 -07:00
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2008-07-03 10:45:37 -04:00
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2006-03-29 22:41:07 +02:00
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2008-01-17 12:01:18 -05:00
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2006-03-29 22:41:07 +02:00
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2012-01-13 09:32:20 +10:30
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2006-03-29 22:41:07 +02:00
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2012-01-13 09:32:20 +10:30
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2009-01-10 23:44:22 -08:00
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2006-03-29 22:41:07 +02:00
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2009-11-23 08:38:16 -08:00
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
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2008-01-17 12:01:18 -05:00
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2006-07-31 21:43:24 +02:00
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2008-01-17 12:01:18 -05:00
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2006-12-11 18:17:45 +01:00
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2010-07-15 09:21:40 -07:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:17:18 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-03 23:46:48 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:17:18 -08:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2008-07-03 10:45:37 -04:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-11-17 22:50:15 +01:00
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2007-07-03 01:55:03 -04:00
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2007-09-04 23:45:01 -04:00
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2007-10-12 14:19:40 -04:00
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2007-10-22 00:59:47 -04:00
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2009-07-07 22:07:59 -07:00
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2009-07-27 17:35:39 -07:00
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2009-11-23 08:38:16 -08:00
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2010-06-28 09:38:48 -07:00
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2010-02-04 00:17:18 -08:00
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2011-11-04 23:56:05 -07:00
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2012-03-04 10:41:36 -08:00
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2006-03-29 22:41:07 +02:00
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2008-07-03 10:45:37 -04:00
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2009-02-28 12:50:54 -08:00
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2008-07-03 10:45:37 -04:00
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2010-01-10 23:59:05 -08:00
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2007-06-12 00:33:13 -04:00
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2008-07-03 10:45:37 -04:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2010-11-22 12:00:05 -08:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-07-31 21:43:24 +02:00
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2007-06-12 00:33:13 -04:00
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2006-07-31 21:43:24 +02:00
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2007-06-12 00:33:13 -04:00
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2006-11-17 22:50:15 +01:00
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2007-07-03 01:55:03 -04:00
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2007-09-04 23:45:01 -04:00
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2007-10-12 14:19:40 -04:00
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2007-10-22 00:59:47 -04:00
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2009-07-07 22:07:59 -07:00
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2009-07-27 17:35:39 -07:00
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2009-11-23 08:38:16 -08:00
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2010-06-28 09:38:48 -07:00
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2009-11-29 23:37:07 -08:00
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2010-02-04 00:17:18 -08:00
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2011-11-04 23:56:05 -07:00
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2012-03-04 10:41:36 -08:00
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2006-03-29 22:41:07 +02:00
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2009-07-27 17:35:39 -07:00
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2010-02-03 23:46:48 -08:00
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2009-07-27 17:35:39 -07:00
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2010-02-03 23:46:48 -08:00
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2009-07-27 17:35:39 -07:00
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2012-05-04 15:33:16 -07:00
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2012-05-01 21:33:23 -07:00
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2009-07-27 17:35:39 -07:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2008-01-17 12:01:18 -05:00
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2006-03-29 22:41:07 +02:00
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2012-09-04 20:27:37 -07:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2012-03-04 10:41:36 -08:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2009-01-10 23:44:22 -08:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2010-02-03 23:46:48 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-03 23:46:48 -08:00
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2006-03-29 22:41:07 +02:00
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2012-05-04 15:33:16 -07:00
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2012-05-01 21:33:23 -07:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2010-02-03 23:46:48 -08:00
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2006-07-31 21:43:24 +02:00
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2012-05-04 15:33:16 -07:00
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2012-05-01 21:33:23 -07:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2009-01-10 23:44:22 -08:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2007-06-12 00:33:13 -04:00
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2008-01-17 12:01:18 -05:00
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2006-12-11 18:17:45 +01:00
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2006-07-31 21:43:24 +02:00
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2006-12-11 18:17:45 +01:00
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2006-07-31 21:43:24 +02:00
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2007-06-12 00:33:13 -04:00
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2006-12-11 18:17:45 +01:00
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2006-07-31 21:43:24 +02:00
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2006-12-11 18:17:45 +01:00
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2006-07-31 21:43:24 +02:00
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2006-11-17 22:50:15 +01:00
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2007-06-12 00:33:13 -04:00
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2006-11-17 22:50:15 +01:00
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2010-02-03 23:46:48 -08:00
|
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2008-04-04 15:31:47 -04:00
|
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2006-11-17 22:50:15 +01:00
|
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2010-07-15 09:21:40 -07:00
|
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2008-04-04 15:31:47 -04:00
|
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2006-11-17 22:50:15 +01:00
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2008-04-04 15:31:47 -04:00
|
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|
|
Input: usbtouchscreen - fix TSC-10 DM USB controllers without EEPROM
The usbtouchscreen module implements a driver for the TSC-10 DM USB
touchscreen controllers, but assumes a 2-byte response for the
CMD_RESET and CMD_RATE commands, when they can be only a single byte
when no EEPROM is connected.
The driver worked with an earlier controller revision, but new
revisions of the controller fail.
It seems the problem is that the early controller had the
SEL4/EEPROM-CS pin high, but the new controller has it down, making
the response different.
Without the fix, the controller would answer the single byte 0x06
(ACK), making the init fail with -ENODEV because buf[1] is 0xFF (as
initialized before).
As the single byte is the only thing we need to check it was ok, there
is no need to verify the second byte.
The [0x15 0x01] case is the NAK [0x15] response for when there is no
data in the EEPROM [bit-0 of second byte set], so I let that be, as I
don't have any controller with an EEPROM.
With this patch, both the earlier and latest controller work the same.
Note: This was previously submited as BUG #11961 [1] on the bugzilla
tracker, but rebased to version 2.6.27.4 and with unnecessary comments
and printk's removed.
[1] http://bugzilla.kernel.org/show_bug.cgi?id=11961
Signed-off-by: Nuno Lucas <ntlucas@gmail.com>
Acked-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2008-11-11 16:48:04 -05:00
|
|
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|
2008-04-04 15:31:47 -04:00
|
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2006-11-17 22:50:15 +01:00
|
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|
2008-04-04 15:31:47 -04:00
|
|
|
|
Input: usbtouchscreen - fix TSC-10 DM USB controllers without EEPROM
The usbtouchscreen module implements a driver for the TSC-10 DM USB
touchscreen controllers, but assumes a 2-byte response for the
CMD_RESET and CMD_RATE commands, when they can be only a single byte
when no EEPROM is connected.
The driver worked with an earlier controller revision, but new
revisions of the controller fail.
It seems the problem is that the early controller had the
SEL4/EEPROM-CS pin high, but the new controller has it down, making
the response different.
Without the fix, the controller would answer the single byte 0x06
(ACK), making the init fail with -ENODEV because buf[1] is 0xFF (as
initialized before).
As the single byte is the only thing we need to check it was ok, there
is no need to verify the second byte.
The [0x15 0x01] case is the NAK [0x15] response for when there is no
data in the EEPROM [bit-0 of second byte set], so I let that be, as I
don't have any controller with an EEPROM.
With this patch, both the earlier and latest controller work the same.
Note: This was previously submited as BUG #11961 [1] on the bugzilla
tracker, but rebased to version 2.6.27.4 and with unnecessary comments
and printk's removed.
[1] http://bugzilla.kernel.org/show_bug.cgi?id=11961
Signed-off-by: Nuno Lucas <ntlucas@gmail.com>
Acked-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2008-11-11 16:48:04 -05:00
|
|
|
|
2008-04-04 15:31:47 -04:00
|
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|
2006-11-17 22:50:15 +01:00
|
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2008-04-04 15:31:47 -04:00
|
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|
2006-11-17 22:50:15 +01:00
|
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|
2006-12-11 18:17:45 +01:00
|
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|
2006-11-17 22:50:15 +01:00
|
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|
2006-12-11 18:17:45 +01:00
|
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2006-11-17 22:50:15 +01:00
|
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|
2007-07-03 01:55:03 -04:00
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|
2009-11-29 23:37:07 -08:00
|
|
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|
2010-06-28 09:38:48 -07:00
|
|
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|
2009-11-29 23:37:07 -08:00
|
|
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|
2010-06-28 09:38:48 -07:00
|
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|
2009-11-29 23:37:07 -08:00
|
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|
2007-07-03 01:55:03 -04:00
|
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|
2007-09-04 23:45:01 -04:00
|
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|
2008-01-17 12:01:18 -05:00
|
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2007-09-04 23:45:01 -04:00
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|
2007-10-12 14:19:40 -04:00
|
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|
2010-02-21 22:52:49 -08:00
|
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|
2007-10-12 14:19:40 -04:00
|
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|
2007-09-04 23:45:01 -04:00
|
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|
2007-10-22 00:59:47 -04:00
|
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|
2009-07-07 22:07:59 -07:00
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2007-10-22 00:59:47 -04:00
|
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2009-11-23 08:38:16 -08:00
|
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|
2012-05-04 15:33:16 -07:00
|
|
|
|
2012-05-01 21:33:23 -07:00
|
|
|
|
2009-11-23 08:38:16 -08:00
|
|
|
|
|
|
|
|
|
2012-05-04 15:33:16 -07:00
|
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|
2009-11-23 08:38:16 -08:00
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2012-05-04 15:33:16 -07:00
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2009-11-23 08:38:16 -08:00
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2012-05-04 15:33:16 -07:00
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2009-11-23 08:38:16 -08:00
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2012-05-04 15:33:16 -07:00
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2009-11-23 08:38:16 -08:00
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2007-10-22 00:59:47 -04:00
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2010-02-04 00:17:18 -08:00
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2010-07-15 09:21:40 -07:00
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2012-05-04 15:33:16 -07:00
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2012-05-01 21:33:23 -07:00
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2010-07-15 09:21:40 -07:00
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2010-02-04 00:17:18 -08:00
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2010-07-15 09:21:40 -07:00
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2010-02-04 00:17:18 -08:00
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2010-07-15 09:21:40 -07:00
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2010-02-04 00:17:18 -08:00
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2010-07-15 09:21:40 -07:00
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2010-02-04 00:17:18 -08:00
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2010-07-15 09:21:40 -07:00
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2010-02-04 00:17:18 -08:00
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2010-06-08 01:01:46 -07:00
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2010-02-04 00:17:18 -08:00
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2010-06-08 01:01:46 -07:00
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2010-05-26 23:30:54 -07:00
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2010-02-04 00:17:18 -08:00
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2010-06-08 01:01:46 -07:00
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2010-02-04 00:17:18 -08:00
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2010-06-08 01:01:46 -07:00
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2010-02-04 00:17:18 -08:00
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2010-06-08 01:01:46 -07:00
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2010-02-04 00:17:18 -08:00
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2010-06-08 01:01:46 -07:00
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2010-02-04 00:17:18 -08:00
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2010-06-08 01:01:46 -07:00
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2010-02-04 00:17:18 -08:00
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2011-11-04 23:56:05 -07:00
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2006-03-29 22:41:07 +02:00
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2008-01-17 12:01:18 -05:00
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2006-03-29 22:41:07 +02:00
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2011-11-04 23:56:05 -07:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2012-09-04 20:27:37 -07:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2007-06-12 00:33:13 -04:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2007-06-12 00:33:13 -04:00
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2006-07-31 21:43:24 +02:00
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2007-06-12 00:33:13 -04:00
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2006-07-31 21:43:24 +02:00
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2006-11-17 22:50:15 +01:00
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2007-06-12 00:33:13 -04:00
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2006-11-17 22:50:15 +01:00
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2007-07-03 01:55:03 -04:00
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2007-09-04 23:45:01 -04:00
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2007-10-12 14:19:40 -04:00
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2010-02-21 22:52:49 -08:00
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2007-10-12 14:19:40 -04:00
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2010-02-21 22:52:49 -08:00
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2007-10-12 14:19:40 -04:00
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2007-10-22 00:59:47 -04:00
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2007-10-12 14:19:40 -04:00
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2007-10-22 00:59:47 -04:00
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2009-07-07 22:07:59 -07:00
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2009-07-27 17:35:39 -07:00
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2009-11-23 08:38:16 -08:00
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2009-11-29 23:37:07 -08:00
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2010-06-28 09:38:48 -07:00
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2009-11-29 23:37:07 -08:00
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2010-06-28 09:38:48 -07:00
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2009-11-29 23:37:07 -08:00
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2010-02-04 00:17:18 -08:00
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2010-05-26 23:30:54 -07:00
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2010-02-04 00:17:18 -08:00
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2010-07-15 09:21:40 -07:00
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2010-02-04 00:17:18 -08:00
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2012-03-04 10:41:36 -08:00
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2006-03-29 22:41:07 +02:00
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-12-11 18:17:45 +01:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
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2006-07-31 21:43:24 +02:00
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2008-01-17 12:01:18 -05:00
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2006-07-31 21:43:24 +02:00
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2008-01-17 12:01:18 -05:00
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2006-07-31 21:43:24 +02:00
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
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2006-07-31 21:43:24 +02:00
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
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2006-03-29 22:41:07 +02:00
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2012-05-04 15:33:16 -07:00
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2006-03-29 22:41:07 +02:00
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2006-09-18 22:49:02 -07:00
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2006-03-29 22:41:07 +02:00
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2012-05-01 21:33:23 -07:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:17:18 -08:00
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2006-03-29 22:41:07 +02:00
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2012-05-01 21:33:23 -07:00
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2006-03-29 22:41:07 +02:00
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2012-05-01 21:33:23 -07:00
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2006-03-29 22:41:07 +02:00
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 14:55:46 +01:00
|
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:19:51 -07:00
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2006-03-29 22:41:07 +02:00
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2012-05-04 15:33:16 -07:00
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2012-04-25 14:48:46 -07:00
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2006-03-29 22:41:07 +02:00
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2007-04-12 01:34:39 -04:00
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2010-07-15 09:19:51 -07:00
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2006-03-29 22:41:07 +02:00
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2010-02-03 23:46:48 -08:00
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:19:51 -07:00
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2009-11-23 08:38:16 -08:00
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2010-07-15 09:19:51 -07:00
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2009-11-23 08:38:16 -08:00
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:19:51 -07:00
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2006-03-29 22:41:07 +02:00
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2007-04-12 01:34:39 -04:00
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2010-07-15 09:19:51 -07:00
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2006-03-29 22:41:07 +02:00
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2009-11-23 08:38:16 -08:00
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2010-07-15 09:19:51 -07:00
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:16:39 -07:00
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:21:40 -07:00
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2012-05-04 15:33:16 -07:00
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2012-05-01 21:33:23 -07:00
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2010-07-15 09:21:40 -07:00
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2006-03-29 22:41:07 +02:00
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2010-04-12 13:17:25 +02:00
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2006-03-29 22:41:07 +02:00
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2010-02-03 23:54:59 -08:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2008-07-03 10:45:37 -04:00
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2006-03-29 22:41:07 +02:00
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2010-02-03 23:54:59 -08:00
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2006-03-29 22:41:07 +02:00
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2010-04-12 13:17:25 +02:00
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2006-03-29 22:41:07 +02:00
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2008-01-17 12:01:18 -05:00
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2006-03-29 22:41:07 +02:00
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2012-05-01 21:33:23 -07:00
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2006-03-29 22:41:07 +02:00
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2010-02-03 23:46:48 -08:00
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2006-03-29 22:41:07 +02:00
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2007-09-06 21:32:16 -04:00
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2006-03-29 22:41:07 +02:00
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2007-04-12 01:35:03 -04:00
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2007-04-12 01:34:39 -04:00
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2006-03-29 22:41:07 +02:00
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2007-10-18 23:40:32 -07:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:17:18 -08:00
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2010-02-03 23:46:48 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:17:18 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-03 23:46:48 -08:00
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:21:40 -07:00
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2012-05-01 21:33:23 -07:00
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2010-07-15 09:21:40 -07:00
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2006-03-29 22:41:07 +02:00
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2012-05-01 21:33:23 -07:00
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2010-07-15 09:21:40 -07:00
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2006-03-29 22:41:07 +02:00
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2012-05-01 21:33:23 -07:00
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2010-02-04 00:17:18 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:20:35 -08:00
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2010-07-15 09:19:51 -07:00
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2010-02-04 00:20:35 -08:00
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2010-07-15 09:19:51 -07:00
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2012-05-04 15:33:16 -07:00
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2012-04-25 14:48:46 -07:00
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2010-02-04 00:20:35 -08:00
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2009-11-23 08:38:16 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:20:35 -08:00
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2010-02-04 00:17:18 -08:00
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2010-02-04 00:20:35 -08:00
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2006-03-29 22:41:07 +02:00
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2006-07-31 21:43:24 +02:00
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2006-03-29 22:41:07 +02:00
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2012-05-04 15:33:16 -07:00
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2012-05-01 21:33:23 -07:00
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2006-03-29 22:41:07 +02:00
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2009-11-23 08:10:50 -08:00
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2006-03-29 22:41:07 +02:00
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2010-02-04 00:17:18 -08:00
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:16:39 -07:00
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2010-07-15 09:21:40 -07:00
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2006-03-29 22:41:07 +02:00
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2010-07-15 09:19:51 -07:00
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2006-03-29 22:41:07 +02:00
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2011-11-18 09:48:31 -08:00
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2006-03-29 22:41:07 +02:00
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