[PATCH-v2] kdump: Enable kdump if 2nd-kernel is loaded.

[Ken'ichi Ohmichi]

Hi,

This patch is a new version by Seto-san's comment.


Changelog since v1:
* Remove the check code other than kexec_crash_image from kexec_should_crash()
  because a kexec cannot crash if there is no image.


This patch enables a kdump if 2nd-kernel is loaded.
(The patch is based on linux-2.6.31-rc2.)

Now, a kdump on oops is enabled if a kernel parameter "oops=panic"
is specified and 2nd-kernel is loaded. I think that a kdump should
be enabled regardless of "oops=panic" if 2nd-kernel is loaded,
because a system administrator loads 2nd-kernel for enabling a kdump.


* Reference
  The discussion about this patch
  http://lists.infradead.org/pipermail/kexec/2009-July/003417.html
  http://lists.infradead.org/pipermail/kexec/2009-July/003433.html


Thanks
Ken'ichi Ohmichi

Signed-off-by: Ken'ichi Ohmichi <oomichi at mxs.nes.nec.co.jp>
Acked-by: Simon Horman <horms at verge.net.au>
---
--- a/kernel/kexec.c	2009-07-08 12:30:26.000000000 +0900
+++ b/kernel/kexec.c	2009-07-13 13:49:03.000000000 +0900
@@ -57,7 +57,7 @@ struct resource crashk_res = {
 
 int kexec_should_crash(struct task_struct *p)
 {
-	if (in_interrupt() || !p->pid || is_global_init(p) || panic_on_oops)
+	if (kexec_crash_image)
 		return 1;
 	return 0;
 }