path: root/arch/powerpc
diff options
authorAdam Litke <>2006-08-18 11:22:21 -0700
committerPaul Mackerras <>2006-08-24 10:07:23 +1000
commitc9169f8747bb282cbe518132bf7d49755a00b6c1 (patch)
tree1357eb203b7e3c80d6ea2036df664e1a3a401555 /arch/powerpc
parentd55c4a76f26160482158cd43788dcfc96a320a4f (diff)
[POWERPC] hugepage BUG fix
On Tue, 2006-08-15 at 08:22 -0700, Dave Hansen wrote: > kernel BUG in cache_free_debugcheck at mm/slab.c:2748! Alright, this one is only triggered when slab debugging is enabled. The slabs are assumed to be aligned on a HUGEPTE_TABLE_SIZE boundary. The free path makes use of this assumption and uses the lowest nibble to pass around an index into an array of kmem_cache pointers. With slab debugging turned on, the slab is still aligned, but the "working" object pointer is not. This would break the assumption above that a full nibble is available for the PGF_CACHENUM_MASK. The following patch reduces PGF_CACHENUM_MASK to cover only the two least significant bits, which is enough to cover the current number of 4 pgtable cache types. Then use this constant to mask out the appropriate part of the huge pte pointer. Signed-off-by: Adam Litke <> Signed-off-by: Andrew Morton <> Signed-off-by: Paul Mackerras <>
Diffstat (limited to 'arch/powerpc')
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 266b8b2ceac9..5615acc29527 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -153,7 +153,7 @@ static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp)
hpdp->pd = 0;
tlb->need_flush = 1;
pgtable_free_tlb(tlb, pgtable_free_cache(hugepte, HUGEPTE_CACHE_NUM,