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ARM: kexec: fix crashkernel= handling

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When the kernel crashkernel parameter is specified with just a size, we
are supposed to allocate a region from RAM to store the crashkernel.
However, ARM merely reserves physical address zero with no checking that
there is even RAM there.

Fix this by lifting similar code from x86, importing it to ARM with the
ARM specific parameters added.  In the absence of any platform specific
information, we allocate the crashkernel region from the first 512MB of
physical memory.

Update the kdump documentation to reflect this change.

Signed-off-by: Russell King <[email protected]>
Reviewed-by: Pratyush Anand <[email protected]>
This commit is contained in:
Russell King 2016-03-14 19:34:37 +00:00
commit 61603016e2
2 changed files with 32 additions and 10 deletions
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13
Documentation/kdump/kdump.txt
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@ -263,12 +263,6 @@ The syntax is:
crashkernel=<range1>:<size1>[,<range2>:<size2>,...][@offset]
range=start-[end]
Please note, on arm, the offset is required.
crashkernel=<range1>:<size1>[,<range2>:<size2>,...]@offset
range=start-[end]
'start' is inclusive and 'end' is exclusive.
For example:
crashkernel=512M-2G:64M,2G-:128M
@ -307,10 +301,9 @@ Boot into System Kernel
on the memory consumption of the kdump system. In general this is not
dependent on the memory size of the production system.
On arm, use "crashkernel=Y@X". Note that the start address of the kernel
will be aligned to 128MiB (0x08000000), so if the start address is not then
any space below the alignment point may be overwritten by the dump-capture kernel,
which means it is possible that the vmcore is not that precise as expected.
On arm, the use of "crashkernel=Y@X" is no longer necessary; the
kernel will automatically locate the crash kernel image within the
first 512MB of RAM if X is not given.
Load the Dump-capture Kernel