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| author | Jason Wessel <jason.wessel@windriver.com> | 2010-05-21 04:04:28 +0200 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2010-05-21 04:04:28 +0200 |
| commit | 4402c153cb9c549cd21d6007ef0dfac50c8d148d (patch) | |
| tree | 2a2589958e3d5243b265ba2a9fb6f5f2ecb33b57 /kernel/debug | |
| parent | MAINTAINERS: update kgdb, kdb, and debug_core info (diff) | |
| download | linux-4402c153cb9c549cd21d6007ef0dfac50c8d148d.tar.xz linux-4402c153cb9c549cd21d6007ef0dfac50c8d148d.zip | |
kdb,debug_core: Allow the debug core to receive a panic notification
It is highly desirable to trap into kdb on panic. The debug core will
attempt to register as the first in line for the panic notifier.
CC: Ingo Molnar <mingo@elte.hu>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'kernel/debug')
| -rw-r--r-- | kernel/debug/debug_core.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index b38bb25dbbb3..64b5588c9638 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -762,11 +762,28 @@ static struct sysrq_key_op sysrq_dbg_op = { }; #endif +static int kgdb_panic_event(struct notifier_block *self, + unsigned long val, + void *data) +{ + if (dbg_kdb_mode) + kdb_printf("PANIC: %s\n", (char *)data); + kgdb_breakpoint(); + return NOTIFY_DONE; +} + +static struct notifier_block kgdb_panic_event_nb = { + .notifier_call = kgdb_panic_event, + .priority = INT_MAX, +}; + static void kgdb_register_callbacks(void) { if (!kgdb_io_module_registered) { kgdb_io_module_registered = 1; kgdb_arch_init(); + atomic_notifier_chain_register(&panic_notifier_list, + &kgdb_panic_event_nb); #ifdef CONFIG_MAGIC_SYSRQ register_sysrq_key('g', &sysrq_dbg_op); #endif @@ -786,6 +803,8 @@ static void kgdb_unregister_callbacks(void) */ if (kgdb_io_module_registered) { kgdb_io_module_registered = 0; + atomic_notifier_chain_unregister(&panic_notifier_list, + &kgdb_panic_event_nb); kgdb_arch_exit(); #ifdef CONFIG_MAGIC_SYSRQ unregister_sysrq_key('g', &sysrq_dbg_op); |