kexec: use a mutex for locking rather than xchg()
authorAndrew Morton <akpm@linux-foundation.org>
Fri, 15 Aug 2008 07:40:27 +0000 (00:40 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 15 Aug 2008 15:35:43 +0000 (08:35 -0700)
Functionally the same, but more conventional.

Cc: Huang Ying <ying.huang@intel.com>
Tested-by: Vivek Goyal <vgoyal@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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