x86, kexec: Make sure to stop all CPUs before exiting the kernel

x86 smp_ops now has a new op, stop_other_cpus which takes a parameter
"wait" this allows the caller to specify if it wants to stop until all
the cpus have processed the stop IPI.  This is required specifically
for the kexec case where we should wait for all the cpus to be stopped
before starting the new kernel.  We now wait for the cpus to stop in
all cases except for panic/kdump where we expect things to be broken
and we are doing our best to make things work anyway.

This patch fixes a legitimate regression, which was introduced during
2.6.30, by commit id 4ef702c10b5df18ab04921fc252c26421d4d6c75.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
LKML-Reference: <1286833028.1372.20.camel@ank32.eng.vmware.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: <stable@kernel.org> v2.6.30-36
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/arch/x86/kernel/smp.c b/arch/x86/kernel/smp.c
index d801210945d6..513deac7228d 100644
--- a/arch/x86/kernel/smp.c
+++ b/arch/x86/kernel/smp.c
@@ -159,10 +159,10 @@ asmlinkage void smp_reboot_interrupt(void)
         irq_exit();
 }
 
-static void native_smp_send_stop(void)
+static void native_stop_other_cpus(int wait)
 {
         unsigned long flags;
-        unsigned long wait;
+        unsigned long timeout;
 
         if (reboot_force)
                 return;
@@ -179,9 +179,12 @@ static void native_smp_send_stop(void)
         if (num_online_cpus() > 1) {
                 apic->send_IPI_allbutself(REBOOT_VECTOR);
 
-                /* Don't wait longer than a second */
-                wait = USEC_PER_SEC;
-                while (num_online_cpus() > 1 && wait--)
+                /*
+                 * Don't wait longer than a second if the caller
+                 * didn't ask us to wait.
+                 */
+                timeout = USEC_PER_SEC;
+                while (num_online_cpus() > 1 && (wait || timeout--))
                         udelay(1);
         }
 
@@ -227,7 +230,7 @@ struct smp_ops smp_ops = {
         .smp_prepare_cpus       = native_smp_prepare_cpus,
         .smp_cpus_done          = native_smp_cpus_done,
 
-        .smp_send_stop          = native_smp_send_stop,
+        .stop_other_cpus        = native_stop_other_cpus,
         .smp_send_reschedule    = native_smp_send_reschedule,
 
         .cpu_up                 = native_cpu_up,