From cfbf07f2a80b618c42a42c20d83647ea8fcceca0 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 15 May 2007 01:42:06 -0700 Subject: [PATCH] SLUB: CONFIG_LARGE_ALLOCS must consider MAX_ORDER limit Take MAX_ORDER into consideration when determining KMALLOC_SHIFT_HIGH. Otherwise we may run into a situation where we attempt to create general slabs larger than MAX_ORDER. Signed-off-by: Christoph Lameter Cc: "David S. Miller" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/slub_def.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index ea27065e80e6..fd6627e2d115 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -60,7 +60,8 @@ struct kmem_cache { #define KMALLOC_SHIFT_LOW 3 #ifdef CONFIG_LARGE_ALLOCS -#define KMALLOC_SHIFT_HIGH 25 +#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT) =< 25 ? \ + (MAX_ORDER + PAGE_SHIFT - 1) : 25) #else #if !defined(CONFIG_MMU) || NR_CPUS > 512 || MAX_NUMNODES > 256 #define KMALLOC_SHIFT_HIGH 20 @@ -87,6 +88,9 @@ static inline int kmalloc_index(int size) */ WARN_ON_ONCE(size == 0); + if (size >= (1 << KMALLOC_SHIFT_HIGH)) + return -1; + if (size > 64 && size <= 96) return 1; if (size > 128 && size <= 192) -- 2.30.2