Commit b3ca8093 authored by Anton Blanchard's avatar Anton Blanchard Committed by Linus Torvalds

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

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: default avatarAnton Blanchard <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent ed90fb4a
......@@ -205,6 +205,7 @@ static void kexec_prepare_cpus(void)
while (paca[i].hw_cpu_id != -1) {
if (!cpu_possible(i)) {
printk("kexec: cpu %d hw_cpu_id %d is not"
" possible, ignoring\n",
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