kexec: fix compilation warning on xchg(&kexec_lock, 0) in kernel_kexec()

kernel/kexec.c: In function 'kernel_kexec': kernel/kexec.c:1506: warning: value computed is not used Signed-off-by: Huang Ying <ying.huang@intel.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>
mariux64 · Aug 15, 2008 · 4cd69b9 · 4cd69b9
1 parent ce289e8
commit 4cd69b9
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/kernel/kexec.c b/kernel/kexec.c
@@ -1503,7 +1503,8 @@ int kernel_kexec(void)
 	}
 
  Unlock:
-	xchg(&kexec_lock, 0);
+	if (!xchg(&kexec_lock, 0))
+		BUG();
 
 	return error;
 }