tree 38900590f1d4f129cfd8748949ff62f7d3296aee
parent 8519fb30e438f8088b71a94a7d5a660a814d3872
author Ingo Molnar <mingo@elte.hu> 1139345934 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1139357553 -0800

[PATCH] Fix spinlock debugging delays to not time out too early

The spinlock-debug wait-loop was using loops_per_jiffy to detect too long
spinlock waits - but on fast CPUs this led to a way too fast timeout and false
messages.

The fix is to include a __delay(1) call in the loop, to correctly approximate
the intended delay timeout of 1 second.  The code assumes that every
architecture implements __delay(1) to last around 1/(loops_per_jiffy*HZ)
seconds.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>