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perf/x86/amd: Fix AMD NB and L2I "uncore" support

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Borislav Petkov reported a lockdep splat warning about kzalloc()
done in an IPI (hardirq) handler.

This is a real bug, do not call kzalloc() in a smp_call_function_single()
handler because it can schedule and crash.

Reported-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Jacob Shin <jacob.shin@amd.com>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: <eranian@google.com>
Cc: <a.p.zijlstra@chello.nl>
Cc: <acme@ghostprotocols.net>
Cc: <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20130421180627.GA21049@jshin-Toonie
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jacob Shin 2013-04-21 13:06:27 -05:00 committed by Ingo Molnar
parent 0cf5f4323b
commit 94f4db3590
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kernel/cpu/perf_event_amd_uncore.c
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@ -498,7 +498,6 @@ static void __init init_cpu_already_online(void *dummy)
{
unsigned int cpu = smp_processor_id();
amd_uncore_cpu_up_prepare(cpu);
amd_uncore_cpu_starting(cpu);
amd_uncore_cpu_online(cpu);
}
@ -535,8 +534,10 @@ static int __init amd_uncore_init(void)
get_online_cpus();
/* init cpus already online before registering for hotplug notifier */
for_each_online_cpu(cpu)
for_each_online_cpu(cpu) {
amd_uncore_cpu_up_prepare(cpu);
smp_call_function_single(cpu, init_cpu_already_online, NULL, 1);
}
register_cpu_notifier(&amd_uncore_cpu_notifier_block);
put_online_cpus();