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Date:	Mon, 7 Feb 2011 13:30:54 +0200
From:	"Ahmed S. Darwish" <>
To:	Randy Dunlap <>
Cc:	Simon Horman <>, Vivek Goyal <>,
	Haren Myneni <>,
	Eric Biederman <>,, LKML <>,
Subject: [PATCH v2 -next] Documentation: Improve crashkernel= description

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 <>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 89835a4..5ad9980 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
-	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 '@...set' is omitted, then a suitable offset
+			is selected automatically.
 			[KNL] Same as above, but depends on the memory

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