[patch 0/3] [x86] Fix crashkernel reservation on NUMA machines

Vivek Goyal vgoyal at redhat.com
Mon Jun 9 09:06:46 EDT 2008

On Sun, Jun 08, 2008 at 03:46:28PM +0200, Bernhard Walle wrote:
> This patch series fixes the crashkernel reservation on NUMA machine. The
> regression was discovered by Dave Anderson <anderson at redhat.com>.
> The background is that on NUMA machines, reserve_bootmem_generic() is required
> instead of reserve_bootmem(). To achieve that, it's necessary to make a few
> API changes.
> The patches are against latest linux-2.6 git. They should still go into 2.6.26
> since it's only bug fixing. For 2.6.27, we should unify crashkernel reservation
> for i386 and x86-64.
> Tested on both i386 and x86-64. Compilation was tested with both kexec disabled
> and enabled. The change is x86 only, so no need to test on other architectures.
> Signed-off-by: Bernhard Walle <bwalle at suse.de>

Yes we should be using reserve_bootmem_generic() for reserving memory
on NUMA machines. Recently myself and Dave A. ran into crash while 
reserving memory using resreve_bootmem() on a NUMA machine. 

Reason for crash? reserve_bootmem() always assumes node id to be zero, and
that was not the case.

Acked-by: Vivek Goyal <vgoyal at redhat.com>


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