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-rw-r--r--arch/x86/kernel/kgdb.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index 4f4af75b9482..01ab17ae2ae7 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -572,7 +572,6 @@ static int __kgdb_notify(struct die_args *args, unsigned long cmd)
return NOTIFY_STOP;
}
-#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
int kgdb_ll_trap(int cmd, const char *str,
struct pt_regs *regs, long err, int trap, int sig)
{
@@ -590,7 +589,6 @@ int kgdb_ll_trap(int cmd, const char *str,
return __kgdb_notify(&args, cmd);
}
-#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
static int
kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
@@ -625,6 +623,12 @@ int kgdb_arch_init(void)
return register_die_notifier(&kgdb_notifier);
}
+static void kgdb_hw_overflow_handler(struct perf_event *event, int nmi,
+ struct perf_sample_data *data, struct pt_regs *regs)
+{
+ kgdb_ll_trap(DIE_DEBUG, "debug", regs, 0, 0, SIGTRAP);
+}
+
void kgdb_arch_late(void)
{
int i, cpu;
@@ -655,6 +659,7 @@ void kgdb_arch_late(void)
for_each_online_cpu(cpu) {
pevent = per_cpu_ptr(breakinfo[i].pev, cpu);
pevent[0]->hw.sample_period = 1;
+ pevent[0]->overflow_handler = kgdb_hw_overflow_handler;
if (pevent[0]->destroy != NULL) {
pevent[0]->destroy = NULL;
release_bp_slot(*pevent);

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