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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 4ef702c10b.

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>
This commit is contained in:
Alok Kataria 2010-10-11 14:37:08 -07:00 committed by H. Peter Anvin
parent 03f1a17cd5
commit 76fac077db
5 changed files with 21 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/x86/include/asm/smp.h
View File

@ -50,7 +50,7 @@ struct smp_ops {
void (*smp_prepare_cpus)(unsigned max_cpus);
void (*smp_cpus_done)(unsigned max_cpus);
void (*smp_send_stop)(void);
void (*stop_other_cpus)(int wait);
void (*smp_send_reschedule)(int cpu);
int (*cpu_up)(unsigned cpu);
@ -73,7 +73,12 @@ extern struct smp_ops smp_ops;
static inline void smp_send_stop(void)
{
smp_ops.smp_send_stop();
smp_ops.stop_other_cpus(0);
}
static inline void stop_other_cpus(void)
{
smp_ops.stop_other_cpus(1);
}
static inline void smp_prepare_boot_cpu(void)

2
arch/x86/kernel/reboot.c
View File

@ -641,7 +641,7 @@ void native_machine_shutdown(void)
/* O.K Now that I'm on the appropriate processor,
* stop all of the others.
*/
smp_send_stop();
stop_other_cpus();
#endif
lapic_shutdown();

15
arch/x86/kernel/smp.c
View File

@ -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,

2
arch/x86/xen/enlighten.c
View File

@ -1018,7 +1018,7 @@ static void xen_reboot(int reason)
struct sched_shutdown r = { .reason = reason };
#ifdef CONFIG_SMP
smp_send_stop();
stop_other_cpus();
#endif
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))

6
arch/x86/xen/smp.c
View File

@ -400,9 +400,9 @@ static void stop_self(void *v)
BUG();
}
static void xen_smp_send_stop(void)
static void xen_stop_other_cpus(int wait)
{
smp_call_function(stop_self, NULL, 0);
smp_call_function(stop_self, NULL, wait);
}
static void xen_smp_send_reschedule(int cpu)
@ -470,7 +470,7 @@ static const struct smp_ops xen_smp_ops __initdata = {
.cpu_disable = xen_cpu_disable,
.play_dead = xen_play_dead,
.smp_send_stop = xen_smp_send_stop,
.stop_other_cpus = xen_stop_other_cpus,
.smp_send_reschedule = xen_smp_send_reschedule,
.send_call_func_ipi = xen_smp_send_call_function_ipi,