tree 02a04c1043bca3f4872ef8b2374f8516e7cba64e
parent f55532a0c0b8bb6148f4e07853b876ef73bc69ca
author Russell King <rmk+kernel@arm.linux.org.uk> 1457984077 +0000
committer Russell King <rmk+kernel@arm.linux.org.uk> 1462270425 +0100

ARM: kexec: fix crashkernel= handling

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 <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Pratyush Anand <panand@redhat.com>