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[PATCH] ppc64: Add missing barrier() in kexec code

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Mikey and I were testing kexec and hit a lockup.  It turns out gcc 4.0
optimises the kexec_prepare_cpus loop so we avoid reloading paca.hw_cpu_id.
 A gcc barrier() fixes the problem.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Anton Blanchard 2005-09-27 21:45:38 -07:00 committed by Linus Torvalds
parent ed90fb4a19
commit b3ca809351
1 changed files with 1 additions and 0 deletions
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arch/ppc64/kernel/machine_kexec.c
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@ -205,6 +205,7 @@ static void kexec_prepare_cpus(void)
continue;
while (paca[i].hw_cpu_id != -1) {
barrier();
if (!cpu_possible(i)) {
printk("kexec: cpu %d hw_cpu_id %d is not"
" possible, ignoring\n",