[PATCH] optional ZONE_DMA: optional ZONE_DMA in the VM

Make ZONE_DMA optional in core code.

- ifdef all code for ZONE_DMA and related definitions following the example
  for ZONE_DMA32 and ZONE_HIGHMEM.

- Without ZONE_DMA, ZONE_HIGHMEM and ZONE_DMA32 we get to a ZONES_SHIFT of
  0.

- Modify the VM statistics to work correctly without a DMA zone.

- Modify slab to not create DMA slabs if there is no ZONE_DMA.

[akpm@osdl.org: cleanup]
[jdike@addtoit.com: build fix]
[apw@shadowen.org: Simplify calculation of the number of bits we need for ZONES_SHIFT]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 90 insertions, 23 deletions

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 063799ea6be0..2a7d15bcde46 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -85,8 +85,10 @@ struct vm_area_struct;
 
 static inline enum zone_type gfp_zone(gfp_t flags)
 {
+#ifdef CONFIG_ZONE_DMA
         if (flags & __GFP_DMA)
                 return ZONE_DMA;
+#endif
 #ifdef CONFIG_ZONE_DMA32
         if (flags & __GFP_DMA32)
                 return ZONE_DMA32;
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 398f2ec55f54..ee9e3143df4f 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -96,6 +96,7 @@ struct per_cpu_pageset {
 #endif
 
 enum zone_type {
+#ifdef CONFIG_ZONE_DMA
         /*
          * ZONE_DMA is used when there are devices that are not able
          * to do DMA to all of addressable memory (ZONE_NORMAL). Then we
@@ -116,6 +117,7 @@ enum zone_type {
          *                      <16M.
          */
         ZONE_DMA,
+#endif
 #ifdef CONFIG_ZONE_DMA32
         /*
          * x86_64 needs two ZONE_DMAs because it supports devices that are
@@ -152,11 +154,27 @@ enum zone_type {
  * match the requested limits. See gfp_zone() in include/linux/gfp.h
  */
 
-#if !defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_HIGHMEM)
+/*
+ * Count the active zones.  Note that the use of defined(X) outside
+ * #if and family is not necessarily defined so ensure we cannot use
+ * it later.  Use __ZONE_COUNT to work out how many shift bits we need.
+ */
+#define __ZONE_COUNT (                  \
+          defined(CONFIG_ZONE_DMA)      \
+        + defined(CONFIG_ZONE_DMA32)    \
+        + 1                             \
+        + defined(CONFIG_HIGHMEM)       \
+)
+#if __ZONE_COUNT < 2
+#define ZONES_SHIFT 0
+#elif __ZONE_COUNT <= 2
 #define ZONES_SHIFT 1
-#else
+#elif __ZONE_COUNT <= 4
 #define ZONES_SHIFT 2
+#else
+#error ZONES_SHIFT -- too many zones configured adjust calculation
 #endif
+#undef __ZONE_COUNT
 
 struct zone {
         /* Fields commonly accessed by the page allocator */
@@ -523,7 +541,11 @@ static inline int is_dma32(struct zone *zone)
 
 static inline int is_dma(struct zone *zone)
 {
+#ifdef CONFIG_ZONE_DMA
         return zone == zone->zone_pgdat->node_zones + ZONE_DMA;
+#else
+        return 0;
+#endif
 }
 
 /* These two functions are used to setup the per zone pages min values */
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 4b463e66ddea..5e4364644ed1 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -19,7 +19,9 @@
 struct cache_sizes {
         size_t                  cs_size;
         struct kmem_cache       *cs_cachep;
+#ifdef CONFIG_ZONE_DMA
         struct kmem_cache       *cs_dmacachep;
+#endif
 };
 extern struct cache_sizes malloc_sizes[];
 
@@ -39,9 +41,12 @@ static inline void *kmalloc(size_t size, gfp_t flags)
                         __you_cannot_kmalloc_that_much();
                 }
 found:
-                return kmem_cache_alloc((flags & GFP_DMA) ?
-                        malloc_sizes[i].cs_dmacachep :
-                        malloc_sizes[i].cs_cachep, flags);
+#ifdef CONFIG_ZONE_DMA
+                if (flags & GFP_DMA)
+                        return kmem_cache_alloc(malloc_sizes[i].cs_dmacachep,
+                                                flags);
+#endif
+                return kmem_cache_alloc(malloc_sizes[i].cs_cachep, flags);
         }
         return __kmalloc(size, flags);
 }
@@ -62,9 +67,12 @@ static inline void *kzalloc(size_t size, gfp_t flags)
                         __you_cannot_kzalloc_that_much();
                 }
 found:
-                return kmem_cache_zalloc((flags & GFP_DMA) ?
-                        malloc_sizes[i].cs_dmacachep :
-                        malloc_sizes[i].cs_cachep, flags);
+#ifdef CONFIG_ZONE_DMA
+                if (flags & GFP_DMA)
+                        return kmem_cache_zalloc(malloc_sizes[i].cs_dmacachep,
+                                                flags);
+#endif
+                return kmem_cache_zalloc(malloc_sizes[i].cs_cachep, flags);
         }
         return __kzalloc(size, flags);
 }
@@ -88,9 +96,13 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
                         __you_cannot_kmalloc_that_much();
                 }
 found:
-                return kmem_cache_alloc_node((flags & GFP_DMA) ?
-                        malloc_sizes[i].cs_dmacachep :
-                        malloc_sizes[i].cs_cachep, flags, node);
+#ifdef CONFIG_ZONE_DMA
+                if (flags & GFP_DMA)
+                        return kmem_cache_alloc_node(malloc_sizes[i].cs_dmacachep,
+                                                flags, node);
+#endif
+                return kmem_cache_alloc_node(malloc_sizes[i].cs_cachep,
+                                                flags, node);
         }
         return __kmalloc_node(size, flags, node);
 }
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 77caf911969c..7ba91f2839fa 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -19,6 +19,12 @@
  * generated will simply be the increment of a global address.
  */
 
+#ifdef CONFIG_ZONE_DMA
+#define DMA_ZONE(xx) xx##_DMA,
+#else
+#define DMA_ZONE(xx)
+#endif
+
 #ifdef CONFIG_ZONE_DMA32
 #define DMA32_ZONE(xx) xx##_DMA32,
 #else
@@ -31,7 +37,7 @@
 #define HIGHMEM_ZONE(xx)
 #endif
 
-#define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
+#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
 
 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
                 FOR_ALL_ZONES(PGALLOC),
@@ -96,7 +102,8 @@ static inline void vm_events_fold_cpu(int cpu)
 #endif /* CONFIG_VM_EVENT_COUNTERS */
 
 #define __count_zone_vm_events(item, zone, delta) \
-                        __count_vm_events(item##_DMA + zone_idx(zone), delta)
+                __count_vm_events(item##_NORMAL - ZONE_NORMAL + \
+                zone_idx(zone), delta)
 
 /*
  * Zone based page accounting with per cpu differentials.
@@ -143,14 +150,16 @@ static inline unsigned long node_page_state(int node,
         struct zone *zones = NODE_DATA(node)->node_zones;
 
         return
+#ifdef CONFIG_ZONE_DMA
+                zone_page_state(&zones[ZONE_DMA], item) +
+#endif
 #ifdef CONFIG_ZONE_DMA32
                 zone_page_state(&zones[ZONE_DMA32], item) +
 #endif
-                zone_page_state(&zones[ZONE_NORMAL], item) +
 #ifdef CONFIG_HIGHMEM
                 zone_page_state(&zones[ZONE_HIGHMEM], item) +
 #endif
-                zone_page_state(&zones[ZONE_DMA], item);
+                zone_page_state(&zones[ZONE_NORMAL], item);
 }
 
 extern void zone_statistics(struct zonelist *, struct zone *);
diff --git a/mm/Kconfig b/mm/Kconfig
index 50f7cfc15b78..79360cf519bf 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -161,3 +161,9 @@ config RESOURCES_64BIT
         default 64BIT
         help
           This option allows memory and IO resources to be 64 bit.
+
+config ZONE_DMA_FLAG
+        int
+        default "0" if !ZONE_DMA
+        default "1"
+
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6cff13840c6d..d461b23a27a1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -73,7 +73,9 @@ static void __free_pages_ok(struct page *page, unsigned int order);
  * don't need any ZONE_NORMAL reservation
  */
 int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = {
+#ifdef CONFIG_ZONE_DMA
          256,
+#endif
 #ifdef CONFIG_ZONE_DMA32
          256,
 #endif
@@ -85,7 +87,9 @@ int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = {
 EXPORT_SYMBOL(totalram_pages);
 
 static char * const zone_names[MAX_NR_ZONES] = {
+#ifdef CONFIG_ZONE_DMA
          "DMA",
+#endif
 #ifdef CONFIG_ZONE_DMA32
          "DMA32",
 #endif
diff --git a/mm/slab.c b/mm/slab.c
index caa8f87e04eb..348396d691a1 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -793,8 +793,10 @@ static inline struct kmem_cache *__find_general_cachep(size_t size,
          * has cs_{dma,}cachep==NULL. Thus no special case
          * for large kmalloc calls required.
          */
+#ifdef CONFIG_ZONE_DMA
         if (unlikely(gfpflags & GFP_DMA))
                 return csizep->cs_dmacachep;
+#endif
         return csizep->cs_cachep;
 }
 
@@ -1493,13 +1495,15 @@ void __init kmem_cache_init(void)
                                         ARCH_KMALLOC_FLAGS|SLAB_PANIC,
                                         NULL, NULL);
                 }
-
-                sizes->cs_dmacachep = kmem_cache_create(names->name_dma,
+#ifdef CONFIG_ZONE_DMA
+                sizes->cs_dmacachep = kmem_cache_create(
+                                        names->name_dma,
                                         sizes->cs_size,
                                         ARCH_KMALLOC_MINALIGN,
                                         ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA|
                                                 SLAB_PANIC,
                                         NULL, NULL);
+#endif
                 sizes++;
                 names++;
         }
@@ -2321,7 +2325,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
         cachep->slab_size = slab_size;
         cachep->flags = flags;
         cachep->gfpflags = 0;
-        if (flags & SLAB_CACHE_DMA)
+        if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA))
                 cachep->gfpflags |= GFP_DMA;
         cachep->buffer_size = size;
         cachep->reciprocal_buffer_size = reciprocal_value(size);
@@ -2643,10 +2647,12 @@ static void cache_init_objs(struct kmem_cache *cachep,
 
 static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags)
 {
-        if (flags & GFP_DMA)
-                BUG_ON(!(cachep->gfpflags & GFP_DMA));
-        else
-                BUG_ON(cachep->gfpflags & GFP_DMA);
+        if (CONFIG_ZONE_DMA_FLAG) {
+                if (flags & GFP_DMA)
+                        BUG_ON(!(cachep->gfpflags & GFP_DMA));
+                else
+                        BUG_ON(cachep->gfpflags & GFP_DMA);
+        }
 }
 
 static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp,
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 5ffa8c27ead8..6c488d6ac425 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -408,6 +408,12 @@ const struct seq_operations fragmentation_op = {
         .show   = frag_show,
 };
 
+#ifdef CONFIG_ZONE_DMA
+#define TEXT_FOR_DMA(xx) xx "_dma",
+#else
+#define TEXT_FOR_DMA(xx)
+#endif
+
 #ifdef CONFIG_ZONE_DMA32
 #define TEXT_FOR_DMA32(xx) xx "_dma32",
 #else
@@ -420,7 +426,7 @@ const struct seq_operations fragmentation_op = {
 #define TEXT_FOR_HIGHMEM(xx)
 #endif
 
-#define TEXTS_FOR_ZONES(xx) xx "_dma", TEXT_FOR_DMA32(xx) xx "_normal", \
+#define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \
                                         TEXT_FOR_HIGHMEM(xx)
 
 static const char * const vmstat_text[] = {