ARM: 7749/1: spinlock: retry trylock operation if strex fails on free lock

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An exclusive store instruction may fail for reasons other than lock
contention (e.g. a cache eviction during the critical section) so, in
line with other architectures using similar exclusive instructions
(alpha, mips, powerpc), retry the trylock operation if the lock appears
to be free but the strex reported failure.

Reported-by: Tony Thompson <anthony.thompson@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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Will Deacon 2013-06-05 11:27:26 +01:00 • committed by Russell King

parent 1aa2b3b7a6

commit 15e7e5c1eb

1 changed files with 14 additions and 11 deletions

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arch/arm/include/asm/spinlock.h

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