diff options
| -rw-r--r-- | kernel/debug/debug_core.c | 20 | ||||
| -rw-r--r-- | kernel/debug/debug_core.h | 1 |
2 files changed, 20 insertions, 1 deletions
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 10db2833a423..1fb8b239e567 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -247,6 +247,7 @@ void __weak kgdb_roundup_cpus(void) call_single_data_t *csd; int this_cpu = raw_smp_processor_id(); int cpu; + int ret; for_each_online_cpu(cpu) { /* No need to roundup ourselves */ @@ -254,8 +255,23 @@ void __weak kgdb_roundup_cpus(void) continue; csd = &per_cpu(kgdb_roundup_csd, cpu); + + /* + * If it didn't round up last time, don't try again + * since smp_call_function_single_async() will block. + * + * If rounding_up is false then we know that the + * previous call must have at least started and that + * means smp_call_function_single_async() won't block. + */ + if (kgdb_info[cpu].rounding_up) + continue; + kgdb_info[cpu].rounding_up = true; + csd->func = kgdb_call_nmi_hook; - smp_call_function_single_async(cpu, csd); + ret = smp_call_function_single_async(cpu, csd); + if (ret) + kgdb_info[cpu].rounding_up = false; } } @@ -788,6 +804,8 @@ int kgdb_nmicallback(int cpu, void *regs) struct kgdb_state kgdb_var; struct kgdb_state *ks = &kgdb_var; + kgdb_info[cpu].rounding_up = false; + memset(ks, 0, sizeof(struct kgdb_state)); ks->cpu = cpu; ks->linux_regs = regs; diff --git a/kernel/debug/debug_core.h b/kernel/debug/debug_core.h index 127d9bc49fb4..b4a7c326d546 100644 --- a/kernel/debug/debug_core.h +++ b/kernel/debug/debug_core.h @@ -42,6 +42,7 @@ struct debuggerinfo_struct { int ret_state; int irq_depth; int enter_kgdb; + bool rounding_up; }; extern struct debuggerinfo_struct kgdb_info[]; |