From fb144adc517d9ebe8fd8d98a5696fb68ec91e1f5 Mon Sep 17 00:00:00 2001 From: Andy Whitcroft Date: Thu, 15 Jan 2009 13:50:52 -0800 Subject: 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 Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/sysrq.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/char/sysrq.c') 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 : "); -- cgit v1.2.3