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Subject[PATCH] kexec jump: fix compiling warning on xchg(&kexec_lock, 0) in kernel_kexec()
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Fix compiling warning on xchg(&kexec_lock, 0) in kernel_kexec().

Signed-off-by: Huang Ying <ying.huang@intel.com>

---
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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