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Subject[053/139] x86: Handle overlapping mptables
2.6.33-stable review patch.  If anyone has any objections, please let us know.


From: Andi Kleen <>

commit 909fc87b32b3b9e3f0b87dcc5d98319c41900c58 upstream.

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 <>
Tested-by: Thomas Renninger <>
Signed-off-by: Andi Kleen <>
LKML-Reference: <>
Signed-off-by: H. Peter Anvin <>
Signed-off-by: Greg Kroah-Hartman <>

arch/x86/kernel/mpparse.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/mpparse.c
+++ b/arch/x86/kernel/mpparse.c
@@ -664,7 +664,7 @@ static void __init smp_reserve_memory(st
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(unsign
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)

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