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authorAdam Litke <agl@us.ibm.com>2006-08-18 14:22:21 -0400
committerPaul Mackerras <paulus@samba.org>2006-08-23 20:07:23 -0400
commitc9169f8747bb282cbe518132bf7d49755a00b6c1 (patch)
tree1357eb203b7e3c80d6ea2036df664e1a3a401555 /include/asm-powerpc/pgalloc.h
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 <agl@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'include/asm-powerpc/pgalloc.h')
-rw-r--r--include/asm-powerpc/pgalloc.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-powerpc/pgalloc.h b/include/asm-powerpc/pgalloc.h
index 9f0917c68659..ae63db7b3e7d 100644
--- a/include/asm-powerpc/pgalloc.h
+++ b/include/asm-powerpc/pgalloc.h
@@ -117,7 +117,7 @@ static inline void pte_free(struct page *ptepage)
117 pte_free_kernel(page_address(ptepage)); 117 pte_free_kernel(page_address(ptepage));
118} 118}
119 119
120#define PGF_CACHENUM_MASK 0xf 120#define PGF_CACHENUM_MASK 0x3
121 121
122typedef struct pgtable_free { 122typedef struct pgtable_free {
123 unsigned long val; 123 unsigned long val;