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| author | Daniel Thompson <daniel.thompson@linaro.org> | 2014-11-07 19:37:57 +0100 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2015-02-19 19:39:02 +0100 |
| commit | f7d4ca8bbfda23b4f1eae9b6757ff64166b093d5 (patch) | |
| tree | 86344cfa2840a6401e62628e92a7591678c5150d /kernel/printk | |
| parent | kdb: Fix off by one error in kdb_cpu() (diff) | |
| download | linux-f7d4ca8bbfda23b4f1eae9b6757ff64166b093d5.tar.xz linux-f7d4ca8bbfda23b4f1eae9b6757ff64166b093d5.zip | |
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
04d2c8c83d0e ("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>
Diffstat (limited to 'kernel/printk')
| -rw-r--r-- | kernel/printk/printk.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 02d6b6d28796..fae29e3ffbf0 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1811,7 +1811,7 @@ int vprintk_default(const char *fmt, va_list args) #ifdef CONFIG_KGDB_KDB if (unlikely(kdb_trap_printk)) { - r = vkdb_printf(fmt, args); + r = vkdb_printf(KDB_MSGSRC_PRINTK, fmt, args); return r; } #endif |