8 files changed, 34 insertions, 71 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 1a4930509325..d80e5b1d686e 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -560,14 +560,6 @@ endchoice
 
 source "mm/Kconfig"
 
-config LARGE_ALLOCS
-        bool "Allow allocating large blocks (> 1MB) of memory"
-        help
-          Allow the slab memory allocator to keep chains for very large
-          memory sizes - upto 32MB. You may need this if your system has
-          a lot of RAM, and you need to able to allocate very large
-          contiguous chunks. If unsure, say N.
-
 config BFIN_DMA_5XX
         bool "Enable DMA Support"
         depends on (BF533 || BF532 || BF531 || BF537 || BF536 || BF534 || BF561)
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index 114738a45582..74eef7111f2b 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -102,14 +102,6 @@ config HIGHPTE
           with a lot of RAM, this can be wasteful of precious low memory.
           Setting this option will put user-space page tables in high memory.
 
-config LARGE_ALLOCS
-        bool "Allow allocating large blocks (> 1MB) of memory"
-        help
-          Allow the slab memory allocator to keep chains for very large memory
-          sizes - up to 32MB. You may need this if your system has a lot of
-          RAM, and you need to able to allocate very large contiguous chunks.
-          If unsure, say N.
-
 source "mm/Kconfig"
 
 choice
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 823f73736bb5..adc64a2bafbb 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -470,14 +470,6 @@ config AVNET
         default y
         depends on (AVNET5282)
 
-config LARGE_ALLOCS
-        bool "Allow allocating large blocks (> 1MB) of memory"
-        help
-          Allow the slab memory allocator to keep chains for very large
-          memory sizes - upto 32MB. You may need this if your system has
-          a lot of RAM, and you need to able to allocate very large
-          contiguous chunks. If unsure, say N.
-
 config 4KSTACKS
         bool "Use 4Kb for kernel stacks instead of 8Kb"
         default y
diff --git a/arch/v850/Kconfig b/arch/v850/Kconfig
index 5f54c1236c18..ace479ab273f 100644
--- a/arch/v850/Kconfig
+++ b/arch/v850/Kconfig
@@ -240,14 +240,6 @@ menu "Processor type and features"
    config RESET_GUARD
           bool "Reset Guard"
 
-   config LARGE_ALLOCS
-          bool "Allow allocating large blocks (> 1MB) of memory"
-          help
-             Allow the slab memory allocator to keep chains for very large
-             memory sizes - upto 32MB. You may need this if your system has
-             a lot of RAM, and you need to able to allocate very large
-             contiguous chunks. If unsure, say N.
-
 source "mm/Kconfig"
 
 endmenu
diff --git a/include/linux/kmalloc_sizes.h b/include/linux/kmalloc_sizes.h
index bda23e00ed71..e576b848ce10 100644
--- a/include/linux/kmalloc_sizes.h
+++ b/include/linux/kmalloc_sizes.h
@@ -19,17 +19,27 @@
         CACHE(32768)
         CACHE(65536)
         CACHE(131072)
-#if (NR_CPUS > 512) || (MAX_NUMNODES > 256) || !defined(CONFIG_MMU)
+#if KMALLOC_MAX_SIZE >= 262144
         CACHE(262144)
 #endif
-#ifndef CONFIG_MMU
+#if KMALLOC_MAX_SIZE >= 524288
         CACHE(524288)
+#endif
+#if KMALLOC_MAX_SIZE >= 1048576
         CACHE(1048576)
-#ifdef CONFIG_LARGE_ALLOCS
+#endif
+#if KMALLOC_MAX_SIZE >= 2097152
         CACHE(2097152)
+#endif
+#if KMALLOC_MAX_SIZE >= 4194304
         CACHE(4194304)
+#endif
+#if KMALLOC_MAX_SIZE >= 8388608
         CACHE(8388608)
+#endif
+#if KMALLOC_MAX_SIZE >= 16777216
         CACHE(16777216)
+#endif
+#if KMALLOC_MAX_SIZE >= 33554432
         CACHE(33554432)
-#endif /* CONFIG_LARGE_ALLOCS */
-#endif /* CONFIG_MMU */
+#endif
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 6fb2ae214152..a015236cc572 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -74,6 +74,21 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
 #endif
 
 /*
+ * The largest kmalloc size supported by the slab allocators is
+ * 32 megabyte (2^25) or the maximum allocatable page order if that is
+ * less than 32 MB.
+ *
+ * WARNING: Its not easy to increase this value since the allocators have
+ * to do various tricks to work around compiler limitations in order to
+ * ensure proper constant folding.
+ */
+#define KMALLOC_SHIFT_HIGH      ((MAX_ORDER + PAGE_SHIFT) <= 25 ? \
+                                (MAX_ORDER + PAGE_SHIFT) : 25)
+
+#define KMALLOC_MAX_SIZE        (1UL << KMALLOC_SHIFT_HIGH)
+#define KMALLOC_MAX_ORDER       (KMALLOC_SHIFT_HIGH - PAGE_SHIFT)
+
+/*
  * Common kmalloc functions provided by all allocators
  */
 void *__kmalloc(size_t, gfp_t);
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a9fb92862aaa..0764c829d967 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -58,17 +58,6 @@ struct kmem_cache {
  */
 #define KMALLOC_SHIFT_LOW 3
 
-#ifdef CONFIG_LARGE_ALLOCS
-#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
-#else
-#define KMALLOC_SHIFT_HIGH 18
-#endif
-#endif
-
 /*
  * We keep the general caches in an array of slab caches that are used for
  * 2^x bytes of allocations.
@@ -79,7 +68,7 @@ extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
  * Sorry that the following has to be that ugly but some versions of GCC
  * have trouble with constant propagation and loops.
  */
-static inline int kmalloc_index(int size)
+static inline int kmalloc_index(size_t size)
 {
         /*
          * We should return 0 if size == 0 but we use the smallest object
@@ -87,7 +76,7 @@ static inline int kmalloc_index(int size)
          */
         WARN_ON_ONCE(size == 0);
 
-        if (size > (1 << KMALLOC_SHIFT_HIGH))
+        if (size > KMALLOC_MAX_SIZE)
                 return -1;
 
         if (size > 64 && size <= 96)
@@ -110,17 +99,13 @@ static inline int kmalloc_index(int size)
         if (size <=  64 * 1024) return 16;
         if (size <= 128 * 1024) return 17;
         if (size <= 256 * 1024) return 18;
-#if KMALLOC_SHIFT_HIGH > 18
         if (size <=  512 * 1024) return 19;
         if (size <= 1024 * 1024) return 20;
-#endif
-#if KMALLOC_SHIFT_HIGH > 20
         if (size <=  2 * 1024 * 1024) return 21;
         if (size <=  4 * 1024 * 1024) return 22;
         if (size <=  8 * 1024 * 1024) return 23;
         if (size <= 16 * 1024 * 1024) return 24;
         if (size <= 32 * 1024 * 1024) return 25;
-#endif
         return -1;
 
 /*
diff --git a/mm/slab.c b/mm/slab.c
index 1dc0ce1d0d5d..528243e15cc8 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -569,21 +569,6 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp)
 #endif
 
 /*
- * Maximum size of an obj (in 2^order pages) and absolute limit for the gfp
- * order.
- */
-#if defined(CONFIG_LARGE_ALLOCS)
-#define MAX_OBJ_ORDER   13      /* up to 32Mb */
-#define MAX_GFP_ORDER   13      /* up to 32Mb */
-#elif defined(CONFIG_MMU)
-#define MAX_OBJ_ORDER   5       /* 32 pages */
-#define MAX_GFP_ORDER   5       /* 32 pages */
-#else
-#define MAX_OBJ_ORDER   8       /* up to 1Mb */
-#define MAX_GFP_ORDER   8       /* up to 1Mb */
-#endif
-
-/*
  * Do not go above this order unless 0 objects fit into the slab.
  */
 #define BREAK_GFP_ORDER_HI      1
@@ -2002,7 +1987,7 @@ static size_t calculate_slab_order(struct kmem_cache *cachep,
         size_t left_over = 0;
         int gfporder;
 
-        for (gfporder = 0; gfporder <= MAX_GFP_ORDER; gfporder++) {
+        for (gfporder = 0; gfporder <= KMALLOC_MAX_ORDER; gfporder++) {
                 unsigned int num;
                 size_t remainder;
 
@@ -2148,7 +2133,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
          * Sanity checks... these are all serious usage bugs.
          */
         if (!name || in_interrupt() || (size < BYTES_PER_WORD) ||
-            (size > (1 << MAX_OBJ_ORDER) * PAGE_SIZE) || dtor) {
+            size > KMALLOC_MAX_SIZE || dtor) {
                 printk(KERN_ERR "%s: Early error in slab %s\n", __FUNCTION__,
                                 name);
                 BUG();