sysrq: add commentary on why we use the console loglevel over using KERN_EMERG

[linux-2.6-omap-h63xx.git] / drivers / char / sysrq.c

diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index d41b9f6f7903d297976114553527ce51f7e44e3e..33a9351c896dfbaff7dbf9afb5515d998bbb943e 100644 (file)
--- 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 : ");