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linux/arch/parisc
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John David Anglin 2cc1ff50c4 parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm 
commit febe42964f upstream.

We have four routines in pacache.S that use temporary alias pages:
copy_user_page_asm(), clear_user_page_asm(), flush_dcache_page_asm() and
flush_icache_page_asm().  copy_user_page_asm() and clear_user_page_asm()
don't purge the TLB entry used for the operation.
flush_dcache_page_asm() and flush_icache_page_asm do purge the entry.

Presumably, this was thought to optimize TLB use.  However, the
operation is quite heavy weight on PA 1.X processors as we need to take
the TLB lock and a TLB broadcast is sent to all processors.

This patch removes the purges from flush_dcache_page_asm() and
flush_icache_page_asm.

Signed-off-by: John David Anglin  <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2017-02-23 03:54:43 +00:00
..
configs USB: remove CONFIG_USB_DEBUG from defconfig files 2014-05-28 09:40:45 -07:00
hpux execve: use 'struct filename *' for executable name passing 2014-02-05 12:54:53 -08:00
include parisc: Purge TLB before setting PTE 2017-02-23 03:54:43 +00:00
kernel parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm 2017-02-23 03:54:43 +00:00
lib parisc: Unbreak handling exceptions from kernel modules 2016-05-01 00:06:10 +02:00
math-emu parisc: remove duplicate define 2013-11-07 22:28:15 +01:00
mm parisc: Unbreak handling exceptions from kernel modules 2016-05-01 00:06:10 +02:00
oprofile oprofile: more whitespace fixes 2008-10-15 20:55:51 +02:00
defpalo.conf parisc: switch to gzip-compressed vmlinuz kernel 2013-07-09 22:09:20 +02:00
install.sh parisc: make "make install" not depend on vmlinux 2013-11-07 22:28:06 +01:00
Kconfig Merge branch 'parisc-3.15-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2014-05-20 14:35:28 +09:00
Kconfig.debug consolidate per-arch stack overflow debugging options 2013-07-04 11:25:39 -07:00
Makefile parisc: Only use -mfast-indirect-calls option for 32-bit kernel builds 2014-10-05 13:41:08 -07:00
nm Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00