diff options
| author | Feng Tang <feng.tang@intel.com> | 2019-05-17 14:31:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-05-18 15:52:26 -0700 |
| commit | de6da1e8bcf0dd2058b950b127491821207679dc (patch) | |
| tree | 2d54c823763d46cd070e5a721040bc1514df52ed /include/linux | |
| parent | 5d59aa8f9ce972b472201aed86e904bb75879ff0 (diff) | |
| download | linux-de6da1e8bcf0dd2058b950b127491821207679dc.tar.gz linux-de6da1e8bcf0dd2058b950b127491821207679dc.tar.bz2 linux-de6da1e8bcf0dd2058b950b127491821207679dc.zip | |
panic: add an option to replay all the printk message in buffer
Currently on panic, kernel will lower the loglevel and print out pending
printk msg only with console_flush_on_panic().
Add an option for users to configure the "panic_print" to replay all
dmesg in buffer, some of which they may have never seen due to the
loglevel setting, which will help panic debugging .
[feng.tang@intel.com: keep the original console_flush_on_panic() inside panic()]
Link: http://lkml.kernel.org/r/1556199137-14163-1-git-send-email-feng.tang@intel.com
[feng.tang@intel.com: use logbuf lock to protect the console log index]
Link: http://lkml.kernel.org/r/1556269868-22654-1-git-send-email-feng.tang@intel.com
Link: http://lkml.kernel.org/r/1556095872-36838-1-git-send-email-feng.tang@intel.com
Signed-off-by: Feng Tang <feng.tang@intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Aaro Koskinen <aaro.koskinen@nokia.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/console.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/linux/console.h b/include/linux/console.h index ec9bdb3d7bab..d09951d5a94e 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -166,6 +166,11 @@ struct console { extern int console_set_on_cmdline; extern struct console *early_console; +enum con_flush_mode { + CONSOLE_FLUSH_PENDING, + CONSOLE_REPLAY_ALL, +}; + extern int add_preferred_console(char *name, int idx, char *options); extern void register_console(struct console *); extern int unregister_console(struct console *); @@ -175,7 +180,7 @@ extern int console_trylock(void); extern void console_unlock(void); extern void console_conditional_schedule(void); extern void console_unblank(void); -extern void console_flush_on_panic(void); +extern void console_flush_on_panic(enum con_flush_mode mode); extern struct tty_driver *console_device(int *); extern void console_stop(struct console *); extern void console_start(struct console *); |