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Date: Sun, 6 Feb 2011 17:41:08 +0200
From: "Ahmed S. Darwish" <darwish.07@gmail.com>
Subject: [PATCH -next] Documentation: Improve crashkernel= description
Message-ID: <20110206154108.GA16542@laptop>
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To: Randy Dunlap <rdunlap@xenotime.net>, Vivek Goyal <vgoyal@redhat.com>, Haren Myneni <hbabu@us.ibm.com>
Cc: linux-doc@vger.kernel.org, kexec@lists.infradead.org, Eric Biederman <ebiederm@xmission.com>, LKML <linux-kernel@vger.kernel.org>

(Also applicable over 2.6.38-rc3)

Had to explore two C code files to make sense of the 'crashkernel='
kernel parameter values.  Improve the situation.

Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
---

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 89835a4..8f26b42 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -545,9 +545,12 @@ and is between 256 and 4096 characters. It is defined in the file
 			Format:
 			<first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
 
-	crashkernel=nn[KMG]@ss[KMG]
-			[KNL] Reserve a chunk of physical memory to
-			hold a kernel to switch to with kexec on panic.
+	crashkernel=size[KMG][@offset[KMG]]
+			[KNL] Using kexec, Linux can switch to a 'crash kernel'
+			upon panic. This parameter reserves the physical
+			memory region [offset, offset + size] for that kernel
+			image. If the '@offset' part was ignored, Linux finds
+			a suitable crash image start address automatically.
 
 	crashkernel=range1:size1[,range2:size2,...][@offset]
 			[KNL] Same as above, but depends on the memory

regards,

-- 
Darwish
http://darwish.07.googlepages.com

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