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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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