diff options
| author | Will Deacon <will.deacon@arm.com> | 2013-09-11 14:23:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:58:21 -0700 |
| commit | c14c338cb05c700a260480c197cfd6da8f8b7d2e (patch) | |
| tree | 1c6ed14664b122f57b4a75cfbad02ede7106f285 /kernel/up.c | |
| parent | 60c323699bb308404dcb60e8808531e02651578a (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')
0 files changed, 0 insertions, 0 deletions