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    SubjectRe: [PATCH -next] Documentation: Improve crashkernel= description
    On Sun, Feb 06, 2011 at 05:41:08PM +0200, Ahmed S. Darwish wrote:
    > (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.

    I think this would be further improved as:

    ... If '@offset' is omitted then a suitable
    offset is selected 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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