From 5211e6e6c671f0d4b1e1a1023384d20227d8ee65 Mon Sep 17 00:00:00 2001 From: Giridhar Pemmasani Date: Sun, 29 Oct 2006 04:46:55 -0800 Subject: [PATCH] [PATCH] Fix GFP_HIGHMEM slab panic As reported by Martin J. Bligh , we let through some non-slab bits to slab allocation through __get_vm_area_node when doing a vmalloc. I haven't been able to reproduce this, although I understand why it happens: vmalloc allocates memory with GFP_KERNEL | __GFP_HIGHMEM and commit 52fd24ca1db3a741f144bbc229beefe044202cac resulted in the same flags are passed down to cache_alloc_refill, causing the BUG. The following patch fixes it. Note that when calling kmalloc_node, I am masking off __GFP_HIGHMEM with GFP_LEVEL_MASK, whereas __vmalloc_area_node does the same with ~(__GFP_HIGHMEM | __GFP_ZERO). IMHO, using GFP_LEVEL_MASK is preferable, but either should fix this problem. Signed-off-by: Giridhar Pemmasani (pgiri@yahoo.com) Cc: Martin J. Bligh Cc: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmalloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 6d381df7c9b3..46606c133e82 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -182,7 +182,7 @@ static struct vm_struct *__get_vm_area_node(unsigned long size, unsigned long fl addr = ALIGN(start, align); size = PAGE_ALIGN(size); - area = kmalloc_node(sizeof(*area), gfp_mask, node); + area = kmalloc_node(sizeof(*area), gfp_mask & GFP_LEVEL_MASK, node); if (unlikely(!area)) return NULL;