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powerpc/kdump: Handle crashkernel memory reservation failure

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Memory reservation for crashkernel could fail if there are holes around
kdump kernel offset (128M). Fail gracefully in such cases and print an
error message.

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Tested-by: David Gibson <dgibson@redhat.com>
Reviewed-by: Dave Young <dyoung@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Hari Bathini 2018-06-28 10:49:56 +05:30 committed by Michael Ellerman
parent 741c5640a1
commit 8950329c4a
1 changed files with 6 additions and 1 deletions
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7
arch/powerpc/kernel/machine_kexec.c
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@ -188,7 +188,12 @@ void __init reserve_crashkernel(void)
(unsigned long)(crashk_res.start >> 20),
(unsigned long)(memblock_phys_mem_size() >> 20));
memblock_reserve(crashk_res.start, crash_size);
if (!memblock_is_region_memory(crashk_res.start, crash_size) ||
memblock_reserve(crashk_res.start, crash_size)) {
pr_err("Failed to reserve memory for crashkernel!\n");
crashk_res.start = crashk_res.end = 0;
return;
}
}
int overlaps_crashkernel(unsigned long start, unsigned long size)