tree debba08531c7dd78b90b5d8f2c03f6bf7c9e7877
parent 3a3b6ed2235f2f619889dd6096e24b6d93bf3339
author Dave Young <hidave.darkstar@gmail.com> 1253663013 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1253716768 -0700

printk: add printk_delay to make messages readable for some scenarios

When syslog is not possible, at the same time there's no serial/net
console available, it will be hard to read the printk messages.  For
example oops/panic/warning messages in shutdown phase.

Add a printk delay feature, we can make each printk message delay some
milliseconds.

Setting the delay by proc/sysctl interface: /proc/sys/kernel/printk_delay

The value range from 0 - 10000, default value is 0

[akpm@linux-foundation.org: fix a few things]
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>