]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
panic: add an option to replay all the printk message in buffer
authorFeng Tang <feng.tang@intel.com>
Fri, 17 May 2019 21:31:50 +0000 (14:31 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 18 May 2019 22:52:26 +0000 (15:52 -0700)
commitde6da1e8bcf0dd2058b950b127491821207679dc
tree2d54c823763d46cd070e5a721040bc1514df52ed
parent5d59aa8f9ce972b472201aed86e904bb75879ff0
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>
Documentation/admin-guide/kernel-parameters.txt
arch/powerpc/kernel/traps.c
include/linux/console.h
kernel/panic.c
kernel/printk/printk.c