diff options
Diffstat (limited to 'drivers/tty/sysrq.c')
| -rw-r--r-- | drivers/tty/sysrq.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c index 2884cd638d64..18e623325887 100644 --- a/drivers/tty/sysrq.c +++ b/drivers/tty/sysrq.c @@ -232,8 +232,10 @@ static void showacpu(void *dummy) unsigned long flags; /* Idle CPUs have no interesting backtrace. */ - if (idle_cpu(smp_processor_id())) + if (idle_cpu(smp_processor_id())) { + pr_info("CPU%d: backtrace skipped as idling\n", smp_processor_id()); return; + } raw_spin_lock_irqsave(&show_lock, flags); pr_info("CPU%d:\n", smp_processor_id()); @@ -260,10 +262,13 @@ static void sysrq_handle_showallcpus(int key) if (in_hardirq()) regs = get_irq_regs(); - if (regs) { - pr_info("CPU%d:\n", smp_processor_id()); + + pr_info("CPU%d:\n", smp_processor_id()); + if (regs) show_regs(regs); - } + else + show_stack(NULL, NULL, KERN_INFO); + schedule_work(&sysrq_showallcpus); } } @@ -274,6 +279,8 @@ static const struct sysrq_key_op sysrq_showallcpus_op = { .action_msg = "Show backtrace of all active CPUs", .enable_mask = SYSRQ_ENABLE_DUMP, }; +#else +#define sysrq_showallcpus_op (*(const struct sysrq_key_op *)NULL) #endif static void sysrq_handle_showregs(int key) @@ -405,6 +412,7 @@ static const struct sysrq_key_op sysrq_moom_op = { .enable_mask = SYSRQ_ENABLE_SIGNAL, }; +#ifdef CONFIG_BLOCK static void sysrq_handle_thaw(int key) { emergency_thaw_all(); @@ -415,6 +423,9 @@ static const struct sysrq_key_op sysrq_thaw_op = { .action_msg = "Emergency Thaw of all frozen filesystems", .enable_mask = SYSRQ_ENABLE_SIGNAL, }; +#else +#define sysrq_thaw_op (*(const struct sysrq_key_op *)NULL) +#endif static void sysrq_handle_kill(int key) { @@ -468,17 +479,9 @@ static const struct sysrq_key_op *sysrq_key_table[62] = { NULL, /* g */ NULL, /* h - reserved for help */ &sysrq_kill_op, /* i */ -#ifdef CONFIG_BLOCK &sysrq_thaw_op, /* j */ -#else - NULL, /* j */ -#endif &sysrq_SAK_op, /* k */ -#ifdef CONFIG_SMP &sysrq_showallcpus_op, /* l */ -#else - NULL, /* l */ -#endif &sysrq_showmem_op, /* m */ &sysrq_unrt_op, /* n */ /* o: This will often be registered as 'Off' at init time */ |