diff options
| author |   Andy Whitcroft <apw@canonical.com> | 2009-01-15 13:50:52 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-15 16:39:36 -0800 |
| commit | fb144adc517d9ebe8fd8d98a5696fb68ec91e1f5 (patch) | |
| tree | 1e7adf4da0fdaef9ffaeff07cc7727b9561261e4 /drivers/char | |
| parent | sysrq documentation: document why the command header only is shown (diff) | |
| download | linux-dev-fb144adc517d9ebe8fd8d98a5696fb68ec91e1f5.tar.xz linux-dev-fb144adc517d9ebe8fd8d98a5696fb68ec91e1f5.zip | |
sysrq: add commentary on why we use the console loglevel over using KERN_EMERG
Add an explanitory comment as to why we modify the kernel console loglevel
rather than simply moving sysrq messages to KERN_EMERG level.
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/sysrq.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c index d41b9f6f7903..33a9351c896d 100644 --- a/drivers/char/sysrq.c +++ b/drivers/char/sysrq.c @@ -473,6 +473,12 @@ void __handle_sysrq(int key, struct tty_struct *tty, int check_mask) unsigned long flags; spin_lock_irqsave(&sysrq_key_table_lock, flags); + /* + * Raise the apparent loglevel to maximum so that the sysrq header + * is shown to provide the user with positive feedback. We do not + * simply emit this at KERN_EMERG as that would change message + * routing in the consumers of /proc/kmsg. + */ orig_log_level = console_loglevel; console_loglevel = 7; printk(KERN_INFO "SysRq : "); |