[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>
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@ -153,7 +153,7 @@ static void free_hugepte_range(struct mmu_gather *tlb, hugepd_t *hpdp)
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hpdp->pd = 0;
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tlb->need_flush = 1;
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pgtable_free_tlb(tlb, pgtable_free_cache(hugepte, HUGEPTE_CACHE_NUM,
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HUGEPTE_TABLE_SIZE-1));
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PGF_CACHENUM_MASK));
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}
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#ifdef CONFIG_PPC_64K_PAGES
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@ -117,7 +117,7 @@ static inline void pte_free(struct page *ptepage)
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pte_free_kernel(page_address(ptepage));
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}
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#define PGF_CACHENUM_MASK 0xf
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#define PGF_CACHENUM_MASK 0x3
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typedef struct pgtable_free {
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unsigned long val;
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