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authorDavid Howells <dhowells@redhat.com>2006-04-10 22:54:23 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-11 06:18:44 -0700
commitdbc8700e27a94621de9d22c506c67913e0121501 (patch)
tree4ac767de021735f8826ac849ac8a3795bd78ade5 /security
parent235963b2edc080b577000031b9ad75804dd83c88 (diff)
downloadlinux-2.6.34-ux500-dbc8700e27a94621de9d22c506c67913e0121501.tar.gz
[PATCH] Fix memory barrier docs wrt atomic ops
Fix the memory barrier documentation to attempt to describe atomic ops correctly. atomic_t ops that return a value _do_ imply smp_mb() either side, and so don't actually require smp_mb__*_atomic_*() special barriers. Also explains why special barriers exist in addition to normal barriers. Further fix the memory barrier documents to portray bitwise operation memory barrier effects correctly following Nick Piggin's comments. It makes the point that any atomic op that both modifies some state in memory and returns information on that state implies memory barriers on both sides. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security')
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