openrisc: enable LOCKDEP_SUPPORT and irqflags tracing

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Lockdep is needed for proving the spinlocks and rwlocks work fine on our
platform.  It also requires calling the trace_hardirqs_off() and
trace_hardirqs_on() pair of routines when entering and exiting an
interrupt.

For OpenRISC the interrupt stack frame does not support frame pointers,
so to call trace_hardirqs_on() and trace_hardirqs_off() here the macro's
build up a stack frame each time.

There is one necessary small change in _sys_call_handler to move
interrupt enabling later so they can get re-enabled during syscall
restart. This was done to fix lockdep warnings that are now possible due
to this
patch.

Signed-off-by: Stafford Horne <shorne@gmail.com>

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This commit is contained in:

Stafford Horne 2017-07-24 21:55:16 +09:00

parent eecac38b04

commit 78cdfb5cf1

2 changed files with 74 additions and 3 deletions

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3

arch/openrisc/Kconfig

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74

arch/openrisc/kernel/entry.S

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