Fix compiling warning on xchg(&kexec_lock, 0) in kernel_kexec().
Signed-off-by: Huang Ying <[EMAIL PROTECTED]>
---
kernel/kexec.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1433,6 +1433,7 @@ module_init(crash_save_vmcoreinfo_init)
int kernel_kexec(void)
{
int error = 0;
+ int locked;
if (xchg(&kexec_lock, 1))
return -EBUSY;
@@ -1498,7 +1499,8 @@ int kernel_kexec(void)
#endif
Unlock:
- xchg(&kexec_lock, 0);
+ locked = xchg(&kexec_lock, 0);
+ BUG_ON(!locked);
return error;
}
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