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authorWill Deacon <will.deacon@arm.com>2013-09-11 14:23:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:58:21 -0700
commitc14c338cb05c700a260480c197cfd6da8f8b7d2e (patch)
tree1c6ed14664b122f57b4a75cfbad02ede7106f285 /kernel/up.c
parent60c323699bb308404dcb60e8808531e02651578a (diff)
kernel/spinlock.c: add default arch_*_relax definitions for GENERIC_LOCKBREAK
When running with GENERIC_LOCKBREAK=y, the locking implementations emit calls to arch_{read,write,spin}_relax when spinning on a contended lock in order to allow architectures to favour the CPU owning the lock if possible. In reality, everybody apart from PowerPC and S390 just does cpu_relax() here, so make that the default behaviour and allow it to be overridden if required. Signed-off-by: Will Deacon <will.deacon@arm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/up.c')
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