[PATCH] kexec warning fix

This fixes a couple of compiler warnings, and adds paranoia checks as well.

Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 37cad75cf494..fcdd5d2bc3f4 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -995,7 +995,8 @@ asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
         image = xchg(dest_image, image);
 
 out:
-        xchg(&kexec_lock, 0); /* Release the mutex */
+        locked = xchg(&kexec_lock, 0); /* Release the mutex */
+        BUG_ON(!locked);
         kimage_free(image);
 
         return result;
@@ -1061,7 +1062,8 @@ void crash_kexec(struct pt_regs *regs)
                         machine_crash_shutdown(&fixed_regs);
                         machine_kexec(kexec_crash_image);
                 }
-                xchg(&kexec_lock, 0);
+                locked = xchg(&kexec_lock, 0);
+                BUG_ON(!locked);
         }
 }