| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 025/137] powerpc/kdump: Handle crashkernel memory reservation failure | Date | Tue, 2 Oct 2018 06:23:46 -0700 |
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4.14-stable review patch. If anyone has any objections, please let me know.
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From: Hari Bathini <hbathini@linux.ibm.com>
[ Upstream commit 8950329c4a64c6d3ca0bc34711a1afbd9ce05657 ]
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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/powerpc/kernel/machine_kexec.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/arch/powerpc/kernel/machine_kexec.c +++ b/arch/powerpc/kernel/machine_kexec.c @@ -186,7 +186,12 @@ 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)
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