commit 5045bcae0fb466a1dbb6af0036e56901fd7aafb7
author Rik van Riel <riel@redhat.com> Tue Apr 29 00:59:21 2008 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Tue Apr 29 08:06:03 2008 -0700
tree 3ad84c429ff74ec0f541cc7cf05ab3788114022f
parent 6e574195b75543bc6a6240306313988b1952470c

sysrq: add show-backtrace-on-all-cpus function

SysRQ-P is not always useful on SMP systems, since it usually ends up showing
the backtrace of a CPU that is doing just fine, instead of the backtrace of
the CPU that is having problems.

This patch adds SysRQ show-all-cpus(L), which shows the backtrace of every
active CPU in the system.  It skips idle CPUs because some SMP systems are
just too large and we already know what the backtrace of the idle task looks
like.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Rik van Riel <riel@redhat.com>
Randy Dunlap <randy.dunlap@oracle.com>
Cc: <lwoodman@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>