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authorDon Zickus <dzickus@redhat.com>2011-01-04 22:38:07 -0500
committerIngo Molnar <mingo@elte.hu>2011-01-05 14:22:57 +0100
commit9ab181fa9ff73a38fccd0a4f1c40a38dfe62b535 (patch)
tree085c11333531b196be9eb8d5e088b169abe82067 /arch/x86/kernel/apic/hw_nmi.c
parentaef1b9cef78ae65c6501850851cc3f61f9be477b (diff)
downloadlinux-9ab181fa9ff73a38fccd0a4f1c40a38dfe62b535.tar.bz2
x86: Only call smp_processor_id in non-preempt cases
There are some paths that walk the die_chain with preemption on. Make sure we are in an NMI call before we start doing anything. This was triggered by do_general_protection calling notify_die with DIE_GPF. Reported-by: Jan Kiszka <jan.kiszka@web.de> Signed-off-by: Don Zickus <dzickus@redhat.com> LKML-Reference: <1294198689-15447-1-git-send-email-dzickus@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/apic/hw_nmi.c')
-rw-r--r--arch/x86/kernel/apic/hw_nmi.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c
index c57d0b599448..2b40a6045da2 100644
--- a/arch/x86/kernel/apic/hw_nmi.c
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -51,7 +51,7 @@ arch_trigger_all_cpu_backtrace_handler(struct notifier_block *self,
{
struct die_args *args = __args;
struct pt_regs *regs;
- int cpu = smp_processor_id();
+ int cpu;
switch (cmd) {
case DIE_NMI:
@@ -63,6 +63,7 @@ arch_trigger_all_cpu_backtrace_handler(struct notifier_block *self,
}
regs = args->regs;
+ cpu = smp_processor_id();
if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
static arch_spinlock_t lock = __ARCH_SPIN_LOCK_UNLOCKED;