ipc,msg: document volatile r_msg
The need for volatile is not obvious, document it. Signed-off-by:Davidlohr Bueso <davidlohr@hp.com> Signed-off-by:
Manfred Spraul <manfred@colorfullife.com> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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