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Subject[patch 3/3] Use reserve_bootmem_generic() to reserve crashkernel memory on x86_64
This patch uses reserve_bootmem_generic() instead of reserve_bootmem()
to reserve the crashkernel memory on x86_64. That's necessary for NUMA
machines, see 00212fef814612245ed0261cbac8426d0c9a31a5:

[PATCH] Fix kdump Crash Kernel boot memory reservation for NUMA machines

This patch will fix a boot memory reservation bug that trashes memory on
the ES7000 when loading the kdump crash kernel.

The code in arch/x86_64/kernel/setup.c to reserve boot memory for the crash
kernel uses the non-numa aware "reserve_bootmem" function instead of the
NUMA aware "reserve_bootmem_generic". I checked to make sure that no other
function was using "reserve_bootmem" and found none, except the ones that
had NUMA ifdef'ed out.

I have tested this patch only on an ES7000 with NUMA on and off (numa=off)
in a single (non-NUMA) and multi-cell (NUMA) configurations.

Signed-off-by: Amul Shah <>
Looks-good-to: Vivek Goyal <>
Cc: Andi Kleen <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>

The switch-back to reserve_bootmem() was accidentally introduced in
5c3391f9f749023a49c64d607da4fb49263690eb when adding the BOOTMEM_EXCLUSIVE

Signed-off-by: Bernhard Walle <>

arch/x86/kernel/setup_64.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -243,7 +243,7 @@ static void __init reserve_crashkernel(v

- if (reserve_bootmem(crash_base, crash_size,
+ if (reserve_bootmem_generic(crash_base, crash_size,
printk(KERN_INFO "crashkernel reservation failed - "
"memory is in use\n");

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