ilcox <matthew@wil.cx> 1207941832 -0400
committer Matthew Wilcox <willy@linux.intel.com> 1208443381 -0400

Improve semaphore documentation

Move documentation from semaphore.h to semaphore.c as requested by
Andrew Morton.  Also reformat to kernel-doc style and add some more
notes about the implementation.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
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