H. Peter Anvin <hpa@zytor.com> 1326166404 -0800
committer H. Peter Anvin <hpa@zytor.com> 1326166404 -0800

x86, atomic: atomic64_read() take a const pointer

atomic64_read() doesn't actually write anything (as far as the C
environment is concerned... the CPU does actually write but that's an
implementation quirk), so it should take a const pointer.

This does NOT mean that it is safe to use atomic64_read() on an object
in readonly storage (it will trap!)

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Link: http://lkml.kernel.org/r/20120109165859.1879abda.akpm@linux-foundation.org
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