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authorVivek Goyal <vgoyal@redhat.com>2013-12-18 17:08:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-18 19:04:50 -0800
commitc97102ba96324da330078ad8619ba4dfe840dbe3 (patch)
treecea4f59c290b44a0c490cfc2be1f1b9d0e5c2aac /kernel/kexec.c
parentb0031f227e47919797dc0e1c1990f3ef151ff0cc (diff)
downloadlwn-c97102ba96324da330078ad8619ba4dfe840dbe3.tar.gz
lwn-c97102ba96324da330078ad8619ba4dfe840dbe3.zip
kexec: migrate to reboot cpu
Commit 1b3a5d02ee07 ("reboot: move arch/x86 reboot= handling to generic kernel") moved reboot= handling to generic code. In the process it also removed the code in native_machine_shutdown() which are moving reboot process to reboot_cpu/cpu0. I guess that thought must have been that all reboot paths are calling migrate_to_reboot_cpu(), so we don't need this special handling. But kexec reboot path (kernel_kexec()) is not calling migrate_to_reboot_cpu() so above change broke kexec. Now reboot can happen on non-boot cpu and when INIT is sent in second kerneo to bring up BP, it brings down the machine. So start calling migrate_to_reboot_cpu() in kexec reboot path to avoid this problem. Bisected by WANG Chao. Reported-by: Matthew Whitehead <mwhitehe@redhat.com> Reported-by: Dave Young <dyoung@redhat.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Tested-by: Baoquan He <bhe@redhat.com> Tested-by: WANG Chao <chaowang@redhat.com> Acked-by: H. Peter Anvin <hpa@linux.intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/kexec.c')
-rw-r--r--kernel/kexec.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c
index d0d8fca54065..9c970167e402 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1680,6 +1680,7 @@ int kernel_kexec(void)
{
kexec_in_progress = true;
kernel_restart_prepare(NULL);
+ migrate_to_reboot_cpu();
printk(KERN_EMERG "Starting new kernel\n");
machine_shutdown();
}