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authorLinus Torvalds <torvalds@linux-foundation.org>2009-08-03 14:08:48 +0900
committerTejun Heo <tj@kernel.org>2009-08-04 01:28:52 +0900
commited8d9adf357ec331603fa1049510399812cea7e5 (patch)
treecc6eae948bf4652b9d87aee796ae78cc6287ac36 /init/do_mounts_md.c
parenta33a052f19a21d727847391c8c1aff3fb221c472 (diff)
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x86, percpu: Add 'percpu_read_stable()' interface for cacheable accesses
This is very useful for some common things like 'get_current()' and 'get_thread_info()', which can be used multiple times in a function, and where the result is cacheable. tj: Added the magical undocumented "P" modifier to UP __percpu_arg() to force gcc to dereference the pointer value passed in via the "p" input constraint. Without this, percpu_read_stable() returns the address of the percpu variable. Also added comment explaining the difference between percpu_read() and percpu_read_stable(). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'init/do_mounts_md.c')
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