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cpumask: Avoid cpumask_t in arch/x86/kernel/apic/nmi.c

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Ingo wants the certainty of a static cpumask (rather than a
cpumask_var_t), but cpumask_t will some day be undefined to
avoid on-stack declarations.

This is what DECLARE_BITMAP/to_cpumask() is for.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
LKML-Reference: <200911031453.52394.rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rusty Russell 2009-11-03 14:53:52 +10:30 committed by Ingo Molnar
parent a489ca355e
commit ce7c42710e
1 changed files with 6 additions and 5 deletions
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11
arch/x86/kernel/apic/nmi.c
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@ -39,7 +39,8 @@
int unknown_nmi_panic;
int nmi_watchdog_enabled;
static cpumask_t backtrace_mask __read_mostly;
/* For reliability, we're prepared to waste bits here. */
static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
/* nmi_active:
* >0: the lapic NMI watchdog is active, but can be disabled
@ -414,7 +415,7 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
}
/* We can be called before check_nmi_watchdog, hence NULL check. */
if (cpumask_test_cpu(cpu, &backtrace_mask)) {
if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
static DEFINE_SPINLOCK(lock); /* Serialise the printks */
spin_lock(&lock);
@ -422,7 +423,7 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
show_regs(regs);
dump_stack();
spin_unlock(&lock);
cpumask_clear_cpu(cpu, &backtrace_mask);
cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
rc = 1;
}
@ -558,14 +559,14 @@ void arch_trigger_all_cpu_backtrace(void)
{
int i;
cpumask_copy(&backtrace_mask, cpu_online_mask);
cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
printk(KERN_INFO "sending NMI to all CPUs:\n");
apic->send_IPI_all(NMI_VECTOR);
/* Wait for up to 10 seconds for all CPUs to do the backtrace */
for (i = 0; i < 10 * 1000; i++) {
if (cpumask_empty(&backtrace_mask))
if (cpumask_empty(to_cpumask(backtrace_mask)))
break;
mdelay(1);
}