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generic-ipi: eliminate WARN_ON()s during oops/panic

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Do not output smp-call related warnings in the oops/panic codepath.

Reported-by: Jan Beulich <jbeulich@novell.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <49B91A7E.76E4.0078.0@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-03-13 10:47:34 +01:00
parent 25d500067d
commit 641cd4cfcd
1 changed files with 4 additions and 3 deletions
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7
kernel/smp.c
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@ -5,6 +5,7 @@
*/ */
#include <linux/rcupdate.h> #include <linux/rcupdate.h>
#include <linux/rculist.h> #include <linux/rculist.h>
#include <linux/kernel.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/percpu.h> #include <linux/percpu.h>
#include <linux/init.h> #include <linux/init.h>
@ -285,7 +286,7 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
this_cpu = get_cpu(); this_cpu = get_cpu();
/* Can deadlock when called with interrupts disabled */ /* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled()); WARN_ON_ONCE(irqs_disabled() && !oops_in_progress);
if (cpu == this_cpu) { if (cpu == this_cpu) {
local_irq_save(flags); local_irq_save(flags);
@ -329,7 +330,7 @@ void __smp_call_function_single(int cpu, struct call_single_data *data,
csd_lock(data); csd_lock(data);
/* Can deadlock when called with interrupts disabled */ /* Can deadlock when called with interrupts disabled */
WARN_ON(wait && irqs_disabled()); WARN_ON_ONCE(wait && irqs_disabled() && !oops_in_progress);
generic_exec_single(cpu, data, wait); generic_exec_single(cpu, data, wait);
} }
@ -365,7 +366,7 @@ void smp_call_function_many(const struct cpumask *mask,
int cpu, next_cpu, this_cpu = smp_processor_id(); int cpu, next_cpu, this_cpu = smp_processor_id();
/* Can deadlock when called with interrupts disabled */ /* Can deadlock when called with interrupts disabled */
WARN_ON(irqs_disabled()); WARN_ON_ONCE(irqs_disabled() && !oops_in_progress);
/* So, what's a CPU they want? Ignoring this one. */ /* So, what's a CPU they want? Ignoring this one. */
cpu = cpumask_first_and(mask, cpu_online_mask); cpu = cpumask_first_and(mask, cpu_online_mask);