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x86: Handle overlapping mptables 

We found a system where the MP table MPC and MPF structures overlap.

That doesn't really matter because the mptable is not used anyways with ACPI,
but it leads to a panic in the early allocator due to the overlapping
reservations in 2.6.33.

Earlier kernels handled this without problems.

Simply change these reservations to reserve_early_overlap_ok to avoid
the panic.

Reported-by: Thomas Renninger <trenn@suse.de>
Tested-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
LKML-Reference: <20100329074111.GA22821@basil.fritz.box>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@kernel.org>
This commit is contained in:
Andi Kleen 2010-03-29 09:41:11 +02:00 committed by H. Peter Anvin
parent 9f3a5f52aa
commit 909fc87b32
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/mpparse.c
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@ -664,7 +664,7 @@ static void __init smp_reserve_memory(struct mpf_intel *mpf)
{
unsigned long size = get_mpc_size(mpf->physptr);
reserve_early(mpf->physptr, mpf->physptr+size, "MP-table mpc");
reserve_early_overlap_ok(mpf->physptr, mpf->physptr+size, "MP-table mpc");
}
static int __init smp_scan_config(unsigned long base, unsigned long length)
@ -693,7 +693,7 @@ static int __init smp_scan_config(unsigned long base, unsigned long length)
mpf, (u64)virt_to_phys(mpf));
mem = virt_to_phys(mpf);
reserve_early(mem, mem + sizeof(*mpf), "MP-table mpf");
reserve_early_overlap_ok(mem, mem + sizeof(*mpf), "MP-table mpf");
if (mpf->physptr)
smp_reserve_memory(mpf);