kexec: fix Oops in crash_shrink_memory()
authorPavan Naregundi <pavan@linux.vnet.ibm.com>
Tue, 29 Jun 2010 22:05:28 +0000 (15:05 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 29 Jun 2010 22:29:31 +0000 (15:29 -0700)
commite05bd3367bd3d88715b53766f95bb3a8ec7ab59e
treedb9f13cd687c39bf873ff5dbed28bbd142fc6940
parent482ce512c543f3b30ab881702fa997e71252e604
kexec: fix Oops in crash_shrink_memory()

When crashkernel is not enabled, "echo 0 > /sys/kernel/kexec_crash_size"
OOPSes the kernel in crash_shrink_memory.  This happens when
crash_shrink_memory tries to release the 'crashk_res' resource which are
not reserved.  Also value of "/sys/kernel/kexec_crash_size" shows as 1,
which should be 0.

This patch fixes the OOPS in crash_shrink_memory and shows
"/sys/kernel/kexec_crash_size" as 0 when crash kernel memory is not
reserved.

Signed-off-by: Pavan Naregundi <pavan@linux.vnet.ibm.com>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/kexec.c