path: root/kernel/up.c
diff options
authorWill Deacon <>2013-09-11 14:23:23 -0700
committerLinus Torvalds <>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 <> Cc: Benjamin Herrenschmidt <> Cc: Martin Schwidefsky <> Cc: Thomas Gleixner <> Cc: Ingo Molnar <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'kernel/up.c')
0 files changed, 0 insertions, 0 deletions