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Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 kgdb fixlet from Ingo Molnar:
 "A single debugging related commit: compress the memory usage of a kgdb
  data structure"

* 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/kgdb: Replace bool_int_array[NR_CPUS] with bitmap
hifive-unleashed-5.1
Linus Torvalds 2015-11-03 20:12:10 -08:00
parent f323c49b30 0d44975d1e
commit 0f25f2c1b1
1 changed files with 11 additions and 6 deletions
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17
arch/x86/kernel/kgdb.c
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@ -511,26 +511,31 @@ single_step_cont(struct pt_regs *regs, struct die_args *args)
return NOTIFY_STOP;
}
static int was_in_debug_nmi[NR_CPUS];
static DECLARE_BITMAP(was_in_debug_nmi, NR_CPUS);
static int kgdb_nmi_handler(unsigned int cmd, struct pt_regs *regs)
{
int cpu;
switch (cmd) {
case NMI_LOCAL:
if (atomic_read(&kgdb_active) != -1) {
/* KGDB CPU roundup */
kgdb_nmicallback(raw_smp_processor_id(), regs);
was_in_debug_nmi[raw_smp_processor_id()] = 1;
cpu = raw_smp_processor_id();
kgdb_nmicallback(cpu, regs);
set_bit(cpu, was_in_debug_nmi);
touch_nmi_watchdog();
return NMI_HANDLED;
}
break;
case NMI_UNKNOWN:
if (was_in_debug_nmi[raw_smp_processor_id()]) {
was_in_debug_nmi[raw_smp_processor_id()] = 0;
cpu = raw_smp_processor_id();
if (__test_and_clear_bit(cpu, was_in_debug_nmi))
return NMI_HANDLED;
}
break;
default:
/* do nothing */