powerpc/rtas: Turn rtas lock into a raw spinlock

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RTAS currently uses a normal spinlock. However it can be called from
contexts where this is not necessarily a good idea. For example, it
can be called while syncing timebases, with the core timebase being
frozen. Unfortunately, that will deadlock in case of lock contention
when spinlock debugging is enabled as the spin lock debugging code
will try to use __delay() which ... relies on the timebase being
enabled.

Also RTAS can be used in some low level IRQ handling code path so it
may as well be a raw spinlock for -rt sake.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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This commit is contained in:

Benjamin Herrenschmidt 2009-06-16 16:42:49 +00:00

parent 5d38902c48

commit f97bb36f70

2 changed files with 30 additions and 10 deletions

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2

arch/powerpc/include/asm/rtas.h

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38

arch/powerpc/kernel/rtas.c

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