Commit b3ca8093 authored Sep 27, 2005 by Anton Blanchard Committed by Linus Torvalds Sep 28, 2005

[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: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent ed90fb4a

arch/ppc64/kernel/machine_kexec.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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",