[PATCH -v3 1/7] kexec jump: clean up #ifdef and comments

[Andrew Morton]

On Tue, 12 Aug 2008 11:14:21 +0800 Huang Ying <ying.huang at intel.com> wrote:

>  	xchg(&kexec_lock, 0);

kernel/kexec.c: In function 'kernel_kexec':
kernel/kexec.c:1501: warning: value computed is not used

Is there any reason why we cannot use the more conventional
test_and_set_bit() etc, rather than this peculiarity?

Or perhaps spin_trylock?