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linux-next/kernel/debug/kdb
Daniel Thompson f7d4ca8bbf kdb: Avoid printing KERN_ levels to consoles
Currently when kdb traps printk messages then the raw log level prefix
(consisting of '\001' followed by a numeral) does not get stripped off
before the message is issued to the various I/O handlers supported by
kdb. This causes annoying visual noise as well as causing problems
grepping for ^. It is also a change of behaviour compared to normal usage
of printk() usage. For example <SysRq>-h ends up with different output to
that of kdb's "sr h".

This patch addresses the problem by stripping log levels from messages
before they are issued to the I/O handlers. printk() which can also
act as an i/o handler in some cases is special cased; if the caller
provided a log level then the prefix will be preserved when sent to
printk().

The addition of non-printable characters to the output of kdb commands is a
regression, albeit and extremely elderly one, introduced by commit
04d2c8c83d ("printk: convert the format for KERN_<LEVEL> to a 2 byte
pattern"). Note also that this patch does *not* restore the original
behaviour from v3.5. Instead it makes printk() from within a kdb command
display the message without any prefix (i.e. like printk() normally does).

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Joe Perches <joe@perches.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2015-02-19 12:39:02 -06:00
..
.gitignore kdb: core for kgdb back end (1 of 2) 2010-05-20 21:04:20 -05:00
kdb_bp.c kdb: Categorize kdb commands (similar to SysRq categorization) 2014-11-11 09:31:52 -06:00
kdb_bt.c kernel/printk: use symbolic defines for console loglevels 2014-06-04 16:54:17 -07:00
kdb_cmds kdb: cleanup unused variables missed in the original kdb merge 2011-08-01 13:23:58 -05:00
kdb_debugger.c kgdb: timeout if secondary CPUs ignore the roundup 2014-11-11 09:31:53 -06:00
kdb_io.c kdb: Avoid printing KERN_ levels to consoles 2015-02-19 12:39:02 -06:00
kdb_keyboard.c KDB: Fix usability issues relating to the 'enter' key. 2012-03-22 15:07:15 -05:00
kdb_main.c kdb: Fix off by one error in kdb_cpu() 2015-02-19 12:39:02 -06:00
kdb_private.h kdb: Rename kdb_repeat_t to kdb_cmdflags_t, cmd_repeat to cmd_flags 2014-11-11 09:31:51 -06:00
kdb_support.c kdb: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:26 +08:00
Makefile kgdboc,keyboard: Keyboard driver for kdb with kgdb 2010-05-20 21:04:24 -05:00