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Commit 226f69a4 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Merge tag 'please-pull-tangchen' of... 

Merge tag 'please-pull-tangchen' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras

 into x86/urgent

Pull MCE fix from Tony Luck:

   "Fix problem in CMCI rediscovery code that was illegally
    migrating worker threads to other cpus."

Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parents 2bbf0a14 85b97637

arch/x86/kernel/cpu/mcheck/mce_intel.c

+18 −13
Original line number Diff line number Diff line
@@ -285,34 +285,39 @@ void cmci_clear(void) 
	raw_spin_unlock_irqrestore(&cmci_discover_lock, flags);

}



static long cmci_rediscover_work_func(void *arg)

{

	int banks;



	/* Recheck banks in case CPUs don't all have the same */

	if (cmci_supported(&banks))

		cmci_discover(banks);



	return 0;

}



/*

 * After a CPU went down cycle through all the others and rediscover

 * Must run in process context.

 */

void cmci_rediscover(int dying)

{

	int banks;

	int cpu;

	cpumask_var_t old;

	int cpu, banks;



	if (!cmci_supported(&banks))

		return;

	if (!alloc_cpumask_var(&old, GFP_KERNEL))

		return;

	cpumask_copy(old, &current->cpus_allowed);



	for_each_online_cpu(cpu) {

		if (cpu == dying)

			continue;

		if (set_cpus_allowed_ptr(current, cpumask_of(cpu)))



		if (cpu == smp_processor_id()) {

			cmci_rediscover_work_func(NULL);

			continue;

		/* Recheck banks in case CPUs don't all have the same */

		if (cmci_supported(&banks))

			cmci_discover(banks);

		}



	set_cpus_allowed_ptr(current, old);

	free_cpumask_var(old);

		work_on_cpu(cpu, cmci_rediscover_work_func, NULL);

	}

}



/*