tree 40d8d017d9631ecefae76eb09e1bbecc23e17452
parent 5dd12af05ca6b7d052c06a9ca4ff755fdfa25ae4
author Linus Torvalds <torvalds@linux-foundation.org> 1303780258 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1303780258 -0700

bit_spinlock: don't play preemption games inside the busy loop

When we are waiting for the bit-lock to be released, and are looping
over the 'cpu_relax()' should not be doing anything else - otherwise we
miss the point of trying to do the whole 'cpu_relax()'.

Do the preemption enable/disable around the loop, rather than inside of
it.

Noticed when I was looking at the code generation for the dcache
__d_drop usage, and the code just looked very odd.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>