[PATCH] slab cleanup

slab.c has become a bit revolting again.  Try to repair it.

- Coding style fixes

- Don't do assignments-in-if-statements.

- Don't typecast assignments to/from void*

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 304 insertions, 292 deletions

diff --git a/mm/slab.c b/mm/slab.c
index 4d5c4b93e0e..7b6f9f10e75 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -50,7 +50,7 @@
  * The head array is strictly LIFO and should improve the cache hit rates.
  * On SMP, it additionally reduces the spinlock operations.
  *
- * The c_cpuarray may not be read with enabled local interrupts - 
+ * The c_cpuarray may not be read with enabled local interrupts -
  * it's changed with a smp_call_function().
  *
  * SMP synchronization:
@@ -266,16 +266,17 @@ struct array_cache {
 	unsigned int batchcount;
 	unsigned int touched;
 	spinlock_t lock;
-	void *entry[0];		/*
-				 * Must have this definition in here for the proper
-				 * alignment of array_cache. Also simplifies accessing
-				 * the entries.
-				 * [0] is for gcc 2.95. It should really be [].
-				 */
+	void *entry[0];	/*
+			 * Must have this definition in here for the proper
+			 * alignment of array_cache. Also simplifies accessing
+			 * the entries.
+			 * [0] is for gcc 2.95. It should really be [].
+			 */
 };
 
-/* bootstrap: The caches do not work without cpuarrays anymore,
- * but the cpuarrays are allocated from the generic caches...
+/*
+ * bootstrap: The caches do not work without cpuarrays anymore, but the
+ * cpuarrays are allocated from the generic caches...
  */
 #define BOOT_CPUCACHE_ENTRIES	1
 struct arraycache_init {
@@ -310,10 +311,8 @@ struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS];
 #define	SIZE_L3 (1 + MAX_NUMNODES)
 
 /*
- * This function must be completely optimized away if
- * a constant is passed to it. Mostly the same as
- * what is in linux/slab.h except it returns an
- * index.
+ * This function must be completely optimized away if a constant is passed to
+ * it.  Mostly the same as what is in linux/slab.h except it returns an index.
  */
 static __always_inline int index_of(const size_t size)
 {
@@ -351,14 +350,14 @@ static void kmem_list3_init(struct kmem_list3 *parent)
 	parent->free_touched = 0;
 }
 
-#define MAKE_LIST(cachep, listp, slab, nodeid)	\
-	do {	\
-		INIT_LIST_HEAD(listp);		\
-		list_splice(&(cachep->nodelists[nodeid]->slab), listp); \
+#define MAKE_LIST(cachep, listp, slab, nodeid)				\
+	do {								\
+		INIT_LIST_HEAD(listp);					\
+		list_splice(&(cachep->nodelists[nodeid]->slab), listp);	\
 	} while (0)
 
-#define	MAKE_ALL_LISTS(cachep, ptr, nodeid)			\
-	do {					\
+#define	MAKE_ALL_LISTS(cachep, ptr, nodeid)				\
+	do {								\
 	MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid);	\
 	MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \
 	MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid);	\
@@ -379,8 +378,8 @@ struct kmem_cache {
 	unsigned int buffer_size;
 /* 2) touched by every alloc & free from the backend */
 	struct kmem_list3 *nodelists[MAX_NUMNODES];
-	unsigned int flags;	/* constant flags */
-	unsigned int num;	/* # of objs per slab */
+	unsigned int flags;		/* constant flags */
+	unsigned int num;		/* # of objs per slab */
 	spinlock_t spinlock;
 
 /* 3) cache_grow/shrink */
@@ -390,11 +389,11 @@ struct kmem_cache {
 	/* force GFP flags, e.g. GFP_DMA */
 	gfp_t gfpflags;
 
-	size_t colour;		/* cache colouring range */
+	size_t colour;			/* cache colouring range */
 	unsigned int colour_off;	/* colour offset */
 	struct kmem_cache *slabp_cache;
 	unsigned int slab_size;
-	unsigned int dflags;	/* dynamic flags */
+	unsigned int dflags;		/* dynamic flags */
 
 	/* constructor func */
 	void (*ctor) (void *, struct kmem_cache *, unsigned long);
@@ -438,8 +437,9 @@ struct kmem_cache {
 #define	OFF_SLAB(x)	((x)->flags & CFLGS_OFF_SLAB)
 
 #define BATCHREFILL_LIMIT	16
-/* Optimization question: fewer reaps means less 
- * probability for unnessary cpucache drain/refill cycles.
+/*
+ * Optimization question: fewer reaps means less probability for unnessary
+ * cpucache drain/refill cycles.
  *
  * OTOH the cpuarrays can contain lots of objects,
  * which could lock up otherwise freeable slabs.
@@ -453,17 +453,19 @@ struct kmem_cache {
 #define	STATS_INC_ALLOCED(x)	((x)->num_allocations++)
 #define	STATS_INC_GROWN(x)	((x)->grown++)
 #define	STATS_INC_REAPED(x)	((x)->reaped++)
-#define	STATS_SET_HIGH(x)	do { if ((x)->num_active > (x)->high_mark) \
-					(x)->high_mark = (x)->num_active; \
-				} while (0)
+#define	STATS_SET_HIGH(x)						\
+	do {								\
+		if ((x)->num_active > (x)->high_mark)			\
+			(x)->high_mark = (x)->num_active;		\
+	} while (0)
 #define	STATS_INC_ERR(x)	((x)->errors++)
 #define	STATS_INC_NODEALLOCS(x)	((x)->node_allocs++)
 #define	STATS_INC_NODEFREES(x)	((x)->node_frees++)
-#define	STATS_SET_FREEABLE(x, i) \
-				do { if ((x)->max_freeable < i) \
-					(x)->max_freeable = i; \
-				} while (0)
-
+#define	STATS_SET_FREEABLE(x, i)					\
+	do {								\
+		if ((x)->max_freeable < i)				\
+			(x)->max_freeable = i;				\
+	} while (0)
 #define STATS_INC_ALLOCHIT(x)	atomic_inc(&(x)->allochit)
 #define STATS_INC_ALLOCMISS(x)	atomic_inc(&(x)->allocmiss)
 #define STATS_INC_FREEHIT(x)	atomic_inc(&(x)->freehit)
@@ -478,9 +480,7 @@ struct kmem_cache {
 #define	STATS_INC_ERR(x)	do { } while (0)
 #define	STATS_INC_NODEALLOCS(x)	do { } while (0)
 #define	STATS_INC_NODEFREES(x)	do { } while (0)
-#define	STATS_SET_FREEABLE(x, i) \
-				do { } while (0)
-
+#define	STATS_SET_FREEABLE(x, i) do { } while (0)
 #define STATS_INC_ALLOCHIT(x)	do { } while (0)
 #define STATS_INC_ALLOCMISS(x)	do { } while (0)
 #define STATS_INC_FREEHIT(x)	do { } while (0)
@@ -488,7 +488,8 @@ struct kmem_cache {
 #endif
 
 #if DEBUG
-/* Magic nums for obj red zoning.
+/*
+ * Magic nums for obj red zoning.
  * Placed in the first word before and the first word after an obj.
  */
 #define	RED_INACTIVE	0x5A2CF071UL	/* when obj is inactive */
@@ -499,7 +500,8 @@ struct kmem_cache {
 #define POISON_FREE	0x6b	/* for use-after-free poisoning */
 #define	POISON_END	0xa5	/* end-byte of poisoning */
 
-/* memory layout of objects:
+/*
+ * memory layout of objects:
  * 0		: objp
  * 0 .. cachep->obj_offset - BYTES_PER_WORD - 1: padding. This ensures that
  * 		the end of an object is aligned with the end of the real
@@ -508,7 +510,8 @@ struct kmem_cache {
  * 		redzone word.
  * cachep->obj_offset: The real object.
  * cachep->buffer_size - 2* BYTES_PER_WORD: redzone word [BYTES_PER_WORD long]
- * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address [BYTES_PER_WORD long]
+ * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address
+ *					[BYTES_PER_WORD long]
  */
 static int obj_offset(struct kmem_cache *cachep)
 {
@@ -552,8 +555,8 @@ 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.
+ * 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 */
@@ -573,9 +576,10 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp)
 #define	BREAK_GFP_ORDER_LO	0
 static int slab_break_gfp_order = BREAK_GFP_ORDER_LO;
 
-/* Functions for storing/retrieving the cachep and or slab from the
- * global 'mem_map'. These are used to find the slab an obj belongs to.
- * With kfree(), these are used to find the cache which an obj belongs to.
+/*
+ * Functions for storing/retrieving the cachep and or slab from the page
+ * allocator.  These are used to find the slab an obj belongs to.  With kfree(),
+ * these are used to find the cache which an obj belongs to.
  */
 static inline void page_set_cache(struct page *page, struct kmem_cache *cache)
 {
@@ -621,7 +625,9 @@ static inline unsigned int obj_to_index(struct kmem_cache *cache,
 	return (unsigned)(obj - slab->s_mem) / cache->buffer_size;
 }
 
-/* These are the default caches for kmalloc. Custom caches can have other sizes. */
+/*
+ * These are the default caches for kmalloc. Custom caches can have other sizes.
+ */
 struct cache_sizes malloc_sizes[] = {
 #define CACHE(x) { .cs_size = (x) },
 #include <linux/kmalloc_sizes.h>
@@ -667,8 +673,8 @@ static DEFINE_MUTEX(cache_chain_mutex);
 static struct list_head cache_chain;
 
 /*
- * vm_enough_memory() looks at this to determine how many
- * slab-allocated pages are possibly freeable under pressure
+ * vm_enough_memory() looks at this to determine how many slab-allocated pages
+ * are possibly freeable under pressure
  *
  * SLAB_RECLAIM_ACCOUNT turns this on per-slab
  */
@@ -687,7 +693,8 @@ static enum {
 
 static DEFINE_PER_CPU(struct work_struct, reap_work);
 
-static void free_block(struct kmem_cache *cachep, void **objpp, int len, int node);
+static void free_block(struct kmem_cache *cachep, void **objpp, int len,
+			int node);
 static void enable_cpucache(struct kmem_cache *cachep);
 static void cache_reap(void *unused);
 static int __node_shrink(struct kmem_cache *cachep, int node);
@@ -697,7 +704,8 @@ static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep)
 	return cachep->array[smp_processor_id()];
 }
 
-static inline struct kmem_cache *__find_general_cachep(size_t size, gfp_t gfpflags)
+static inline struct kmem_cache *__find_general_cachep(size_t size,
+							gfp_t gfpflags)
 {
 	struct cache_sizes *csizep = malloc_sizes;
 
@@ -732,8 +740,9 @@ static size_t slab_mgmt_size(size_t nr_objs, size_t align)
 	return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align);
 }
 
-/* Calculate the number of objects and left-over bytes for a given
-   buffer size. */
+/*
+ * Calculate the number of objects and left-over bytes for a given buffer size.
+ */
 static void cache_estimate(unsigned long gfporder, size_t buffer_size,
 			   size_t align, int flags, size_t *left_over,
 			   unsigned int *num)
@@ -794,7 +803,8 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size,
 
 #define slab_error(cachep, msg) __slab_error(__FUNCTION__, cachep, msg)
 
-static void __slab_error(const char *function, struct kmem_cache *cachep, char *msg)
+static void __slab_error(const char *function, struct kmem_cache *cachep,
+			char *msg)
 {
 	printk(KERN_ERR "slab error in %s(): cache `%s': %s\n",
 	       function, cachep->name, msg);
@@ -918,10 +928,8 @@ static void free_alien_cache(struct array_cache **ac_ptr)
 
 	if (!ac_ptr)
 		return;
-
 	for_each_node(i)
 	    kfree(ac_ptr[i]);
-
 	kfree(ac_ptr);
 }
 
@@ -955,7 +963,8 @@ static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3)
 	}
 }
 
-static void drain_alien_cache(struct kmem_cache *cachep, struct array_cache **alien)
+static void drain_alien_cache(struct kmem_cache *cachep,
+				struct array_cache **alien)
 {
 	int i = 0;
 	struct array_cache *ac;
@@ -998,20 +1007,22 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
 	switch (action) {
 	case CPU_UP_PREPARE:
 		mutex_lock(&cache_chain_mutex);
-		/* we need to do this right in the beginning since
+		/*
+		 * We need to do this right in the beginning since
 		 * alloc_arraycache's are going to use this list.
 		 * kmalloc_node allows us to add the slab to the right
 		 * kmem_list3 and not this cpu's kmem_list3
 		 */
 
 		list_for_each_entry(cachep, &cache_chain, next) {
-			/* setup the size64 kmemlist for cpu before we can
+			/*
+			 * Set up the size64 kmemlist for cpu before we can
 			 * begin anything. Make sure some other cpu on this
 			 * node has not already allocated this
 			 */
 			if (!cachep->nodelists[node]) {
-				if (!(l3 = kmalloc_node(memsize,
-							GFP_KERNEL, node)))
+				l3 = kmalloc_node(memsize, GFP_KERNEL, node);
+				if (!l3)
 					goto bad;
 				kmem_list3_init(l3);
 				l3->next_reap = jiffies + REAPTIMEOUT_LIST3 +
@@ -1027,13 +1038,15 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
 
 			spin_lock_irq(&cachep->nodelists[node]->list_lock);
 			cachep->nodelists[node]->free_limit =
-			    (1 + nr_cpus_node(node)) *
-			    cachep->batchcount + cachep->num;
+				(1 + nr_cpus_node(node)) *
+				cachep->batchcount + cachep->num;
 			spin_unlock_irq(&cachep->nodelists[node]->list_lock);
 		}
 
-		/* Now we can go ahead with allocating the shared array's
-		   & array cache's */
+		/*
+		 * Now we can go ahead with allocating the shared arrays and
+		 * array caches
+		 */
 		list_for_each_entry(cachep, &cache_chain, next) {
 			struct array_cache *nc;
 			struct array_cache *shared;
@@ -1053,7 +1066,6 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
 			if (!alien)
 				goto bad;
 			cachep->array[cpu] = nc;
-
 			l3 = cachep->nodelists[node];
 			BUG_ON(!l3);
 
@@ -1073,7 +1085,6 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
 			}
 #endif
 			spin_unlock_irq(&l3->list_lock);
-
 			kfree(shared);
 			free_alien_cache(alien);
 		}
@@ -1095,7 +1106,6 @@ static int __devinit cpuup_callback(struct notifier_block *nfb,
 		/* fall thru */
 	case CPU_UP_CANCELED:
 		mutex_lock(&cache_chain_mutex);
-
 		list_for_each_entry(cachep, &cache_chain, next) {
 			struct array_cache *nc;
 			struct array_cache *shared;
@@ -1162,7 +1172,7 @@ free_array_cache:
 #endif
 	}
 	return NOTIFY_OK;
-      bad:
+bad:
 	mutex_unlock(&cache_chain_mutex);
 	return NOTIFY_BAD;
 }
@@ -1172,7 +1182,8 @@ static struct notifier_block cpucache_notifier = { &cpuup_callback, NULL, 0 };
 /*
  * swap the static kmem_list3 with kmalloced memory
  */
-static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, int nodeid)
+static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list,
+			int nodeid)
 {
 	struct kmem_list3 *ptr;
 
@@ -1187,8 +1198,9 @@ static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, int no
 	local_irq_enable();
 }
 
-/* Initialisation.
- * Called after the gfp() functions have been enabled, and before smp_init().
+/*
+ * Initialisation.  Called after the page allocator have been initialised and
+ * before smp_init().
  */
 void __init kmem_cache_init(void)
 {
@@ -1213,9 +1225,9 @@ void __init kmem_cache_init(void)
 
 	/* Bootstrap is tricky, because several objects are allocated
 	 * from caches that do not exist yet:
-	 * 1) initialize the cache_cache cache: it contains the struct kmem_cache
-	 *    structures of all caches, except cache_cache itself: cache_cache
-	 *    is statically allocated.
+	 * 1) initialize the cache_cache cache: it contains the struct
+	 *    kmem_cache structures of all caches, except cache_cache itself:
+	 *    cache_cache is statically allocated.
 	 *    Initially an __init data area is used for the head array and the
 	 *    kmem_list3 structures, it's replaced with a kmalloc allocated
 	 *    array at the end of the bootstrap.
@@ -1238,7 +1250,8 @@ void __init kmem_cache_init(void)
 	cache_cache.array[smp_processor_id()] = &initarray_cache.cache;
 	cache_cache.nodelists[numa_node_id()] = &initkmem_list3[CACHE_CACHE];
 
-	cache_cache.buffer_size = ALIGN(cache_cache.buffer_size, cache_line_size());
+	cache_cache.buffer_size = ALIGN(cache_cache.buffer_size,
+					cache_line_size());
 
 	for (order = 0; order < MAX_ORDER; order++) {
 		cache_estimate(order, cache_cache.buffer_size,
@@ -1257,24 +1270,26 @@ void __init kmem_cache_init(void)
 	sizes = malloc_sizes;
 	names = cache_names;
 
-	/* Initialize the caches that provide memory for the array cache
-	 * and the kmem_list3 structures first.
-	 * Without this, further allocations will bug
+	/*
+	 * Initialize the caches that provide memory for the array cache and the
+	 * kmem_list3 structures first.  Without this, further allocations will
+	 * bug.
 	 */
 
 	sizes[INDEX_AC].cs_cachep = kmem_cache_create(names[INDEX_AC].name,
-						      sizes[INDEX_AC].cs_size,
-						      ARCH_KMALLOC_MINALIGN,
-						      (ARCH_KMALLOC_FLAGS |
-						       SLAB_PANIC), NULL, NULL);
+					sizes[INDEX_AC].cs_size,
+					ARCH_KMALLOC_MINALIGN,
+					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
+					NULL, NULL);
 
-	if (INDEX_AC != INDEX_L3)
+	if (INDEX_AC != INDEX_L3) {
 		sizes[INDEX_L3].cs_cachep =
-		    kmem_cache_create(names[INDEX_L3].name,
-				      sizes[INDEX_L3].cs_size,
-				      ARCH_KMALLOC_MINALIGN,
-				      (ARCH_KMALLOC_FLAGS | SLAB_PANIC), NULL,
-				      NULL);
+			kmem_cache_create(names[INDEX_L3].name,
+				sizes[INDEX_L3].cs_size,
+				ARCH_KMALLOC_MINALIGN,
+				ARCH_KMALLOC_FLAGS|SLAB_PANIC,
+				NULL, NULL);
+	}
 
 	while (sizes->cs_size != ULONG_MAX) {
 		/*
@@ -1284,13 +1299,13 @@ void __init kmem_cache_init(void)
 		 * Note for systems short on memory removing the alignment will
 		 * allow tighter packing of the smaller caches.
 		 */
-		if (!sizes->cs_cachep)
+		if (!sizes->cs_cachep) {
 			sizes->cs_cachep = kmem_cache_create(names->name,
-							     sizes->cs_size,
-							     ARCH_KMALLOC_MINALIGN,
-							     (ARCH_KMALLOC_FLAGS
-							      | SLAB_PANIC),
-							     NULL, NULL);
+					sizes->cs_size,
+					ARCH_KMALLOC_MINALIGN,
+					ARCH_KMALLOC_FLAGS|SLAB_PANIC,
+					NULL, NULL);
+		}
 
 		/* Inc off-slab bufctl limit until the ceiling is hit. */
 		if (!(OFF_SLAB(sizes->cs_cachep))) {
@@ -1299,13 +1314,11 @@ void __init kmem_cache_init(void)
 		}
 
 		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);
-
+					sizes->cs_size,
+					ARCH_KMALLOC_MINALIGN,
+					ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA|
+						SLAB_PANIC,
+					NULL, NULL);
 		sizes++;
 		names++;
 	}
@@ -1357,20 +1370,22 @@ void __init kmem_cache_init(void)
 		struct kmem_cache *cachep;
 		mutex_lock(&cache_chain_mutex);
 		list_for_each_entry(cachep, &cache_chain, next)
-		    enable_cpucache(cachep);
+			enable_cpucache(cachep);
 		mutex_unlock(&cache_chain_mutex);
 	}
 
 	/* Done! */
 	g_cpucache_up = FULL;
 
-	/* Register a cpu startup notifier callback
-	 * that initializes cpu_cache_get for all new cpus
+	/*
+	 * Register a cpu startup notifier callback that initializes
+	 * cpu_cache_get for all new cpus
 	 */
 	register_cpu_notifier(&cpucache_notifier);
 
-	/* The reap timers are started later, with a module init call:
-	 * That part of the kernel is not yet operational.
+	/*
+	 * The reap timers are started later, with a module init call: That part
+	 * of the kernel is not yet operational.
 	 */
 }
 
@@ -1378,16 +1393,13 @@ static int __init cpucache_init(void)
 {
 	int cpu;
 
-	/* 
-	 * Register the timers that return unneeded
-	 * pages to gfp.
+	/*
+	 * Register the timers that return unneeded pages to the page allocator
 	 */
 	for_each_online_cpu(cpu)
-	    start_cpu_timer(cpu);
-
+		start_cpu_timer(cpu);
 	return 0;
 }
-
 __initcall(cpucache_init);
 
 /*
@@ -1501,9 +1513,8 @@ static void dump_line(char *data, int offset, int limit)
 {
 	int i;
 	printk(KERN_ERR "%03x:", offset);
-	for (i = 0; i < limit; i++) {
+	for (i = 0; i < limit; i++)
 		printk(" %02x", (unsigned char)data[offset + i]);
-	}
 	printk("\n");
 }
 #endif
@@ -1517,15 +1528,15 @@ static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines)
 
 	if (cachep->flags & SLAB_RED_ZONE) {
 		printk(KERN_ERR "Redzone: 0x%lx/0x%lx.\n",
-		       *dbg_redzone1(cachep, objp),
-		       *dbg_redzone2(cachep, objp));
+			*dbg_redzone1(cachep, objp),
+			*dbg_redzone2(cachep, objp));
 	}
 
 	if (cachep->flags & SLAB_STORE_USER) {
 		printk(KERN_ERR "Last user: [<%p>]",
-		       *dbg_userword(cachep, objp));
+			*dbg_userword(cachep, objp));
 		print_symbol("(%s)",
-			     (unsigned long)*dbg_userword(cachep, objp));
+				(unsigned long)*dbg_userword(cachep, objp));
 		printk("\n");
 	}
 	realobj = (char *)objp + obj_offset(cachep);
@@ -1558,8 +1569,8 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp)
 			/* Print header */
 			if (lines == 0) {
 				printk(KERN_ERR
-				       "Slab corruption: start=%p, len=%d\n",
-				       realobj, size);
+					"Slab corruption: start=%p, len=%d\n",
+					realobj, size);
 				print_objinfo(cachep, objp, 0);
 			}
 			/* Hexdump the affected line */
@@ -1614,11 +1625,10 @@ static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp)
 
 		if (cachep->flags & SLAB_POISON) {
 #ifdef CONFIG_DEBUG_PAGEALLOC
-			if ((cachep->buffer_size % PAGE_SIZE) == 0
-			    && OFF_SLAB(cachep))
+			if (cachep->buffer_size % PAGE_SIZE == 0 &&
+					OFF_SLAB(cachep))
 				kernel_map_pages(virt_to_page(objp),
-						 cachep->buffer_size / PAGE_SIZE,
-						 1);
+					cachep->buffer_size / PAGE_SIZE, 1);
 			else
 				check_poison_obj(cachep, objp);
 #else
@@ -1650,10 +1660,10 @@ static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp)
 }
 #endif
 
-/**
+/*
  * Destroy all the objs in a slab, and release the mem back to the system.
- * Before calling the slab must have been unlinked from the cache.
- * The cache-lock is not held/needed.
+ * Before calling the slab must have been unlinked from the cache.  The
+ * cache-lock is not held/needed.
  */
 static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
 {
@@ -1674,8 +1684,10 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp)
 	}
 }
 
-/* For setting up all the kmem_list3s for cache whose buffer_size is same
-   as size of kmem_list3. */
+/*
+ * For setting up all the kmem_list3s for cache whose buffer_size is same as
+ * size of kmem_list3.
+ */
 static void set_up_list3s(struct kmem_cache *cachep, int index)
 {
 	int node;
@@ -1701,13 +1713,13 @@ static void set_up_list3s(struct kmem_cache *cachep, int index)
  * high order pages for slabs.  When the gfp() functions are more friendly
  * towards high-order requests, this should be changed.
  */
-static inline size_t calculate_slab_order(struct kmem_cache *cachep,
+static size_t calculate_slab_order(struct kmem_cache *cachep,
 			size_t size, size_t align, unsigned long flags)
 {
 	size_t left_over = 0;
 	int gfporder;
 
-	for (gfporder = 0 ; gfporder <= MAX_GFP_ORDER; gfporder++) {
+	for (gfporder = 0; gfporder <= MAX_GFP_ORDER; gfporder++) {
 		unsigned int num;
 		size_t remainder;
 
@@ -1742,7 +1754,7 @@ static inline size_t calculate_slab_order(struct kmem_cache *cachep,
 		/*
 		 * Acceptable internal fragmentation?
 		 */
-		if ((left_over * 8) <= (PAGE_SIZE << gfporder))
+		if (left_over * 8 <= (PAGE_SIZE << gfporder))
 			break;
 	}
 	return left_over;
@@ -1817,9 +1829,8 @@ static void setup_cpu_cache(struct kmem_cache *cachep)
  * and the @dtor is run before the pages are handed back.
  *
  * @name must be valid until the cache is destroyed. This implies that
- * the module calling this has to destroy the cache before getting 
- * unloaded.
- * 
+ * the module calling this has to destroy the cache before getting unloaded.
+ *
  * The flags are
  *
  * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5)
@@ -1837,7 +1848,8 @@ static void setup_cpu_cache(struct kmem_cache *cachep)
  */
 struct kmem_cache *
 kmem_cache_create (const char *name, size_t size, size_t align,
-	unsigned long flags, void (*ctor)(void*, struct kmem_cache *, unsigned long),
+	unsigned long flags,
+	void (*ctor)(void*, struct kmem_cache *, unsigned long),
 	void (*dtor)(void*, struct kmem_cache *, unsigned long))
 {
 	size_t left_over, slab_size, ralign;
@@ -1847,12 +1859,10 @@ 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) ||
+	if (!name || in_interrupt() || (size < BYTES_PER_WORD) ||
 	    (size > (1 << MAX_OBJ_ORDER) * PAGE_SIZE) || (dtor && !ctor)) {
-		printk(KERN_ERR "%s: Early error in slab %s\n",
-		       __FUNCTION__, name);
+		printk(KERN_ERR "%s: Early error in slab %s\n", __FUNCTION__,
+				name);
 		BUG();
 	}
 
@@ -1906,8 +1916,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 	 * above the next power of two: caches with object sizes just above a
 	 * power of two have a significant amount of internal fragmentation.
 	 */
-	if ((size < 4096
-	     || fls(size - 1) == fls(size - 1 + 3 * BYTES_PER_WORD)))
+	if (size < 4096 || fls(size - 1) == fls(size-1 + 3 * BYTES_PER_WORD))
 		flags |= SLAB_RED_ZONE | SLAB_STORE_USER;
 	if (!(flags & SLAB_DESTROY_BY_RCU))
 		flags |= SLAB_POISON;
@@ -1919,13 +1928,14 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 		BUG_ON(dtor);
 
 	/*
-	 * Always checks flags, a caller might be expecting debug
-	 * support which isn't available.
+	 * Always checks flags, a caller might be expecting debug support which
+	 * isn't available.
 	 */
 	if (flags & ~CREATE_MASK)
 		BUG();
 
-	/* Check that size is in terms of words.  This is needed to avoid
+	/*
+	 * Check that size is in terms of words.  This is needed to avoid
 	 * unaligned accesses for some archs when redzoning is used, and makes
 	 * sure any on-slab bufctl's are also correctly aligned.
 	 */
@@ -1934,12 +1944,14 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 		size &= ~(BYTES_PER_WORD - 1);
 	}
 
-	/* calculate out the final buffer alignment: */
+	/* calculate the final buffer alignment: */
+
 	/* 1) arch recommendation: can be overridden for debug */
 	if (flags & SLAB_HWCACHE_ALIGN) {
-		/* Default alignment: as specified by the arch code.
-		 * Except if an object is really small, then squeeze multiple
-		 * objects into one cacheline.
+		/*
+		 * Default alignment: as specified by the arch code.  Except if
+		 * an object is really small, then squeeze multiple objects into
+		 * one cacheline.
 		 */
 		ralign = cache_line_size();
 		while (size <= ralign / 2)
@@ -1959,7 +1971,8 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 		if (ralign > BYTES_PER_WORD)
 			flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
 	}
-	/* 4) Store it. Note that the debug code below can reduce
+	/*
+	 * 4) Store it. Note that the debug code below can reduce
 	 *    the alignment to BYTES_PER_WORD.
 	 */
 	align = ralign;
@@ -2058,7 +2071,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 
 	/* cache setup completed, link it into the list */
 	list_add(&cachep->next, &cache_chain);
-      oops:
+oops:
 	if (!cachep && (flags & SLAB_PANIC))
 		panic("kmem_cache_create(): failed to create slab `%s'\n",
 		      name);
@@ -2109,7 +2122,6 @@ static void smp_call_function_all_cpus(void (*func)(void *arg), void *arg)
 {
 	check_irq_on();
 	preempt_disable();
-
 	local_irq_disable();
 	func(arg);
 	local_irq_enable();
@@ -2120,12 +2132,12 @@ static void smp_call_function_all_cpus(void (*func)(void *arg), void *arg)
 	preempt_enable();
 }
 
-static void drain_array_locked(struct kmem_cache *cachep, struct array_cache *ac,
-				int force, int node);
+static void drain_array_locked(struct kmem_cache *cachep,
+			struct array_cache *ac, int force, int node);
 
 static void do_drain(void *arg)
 {
-	struct kmem_cache *cachep = (struct kmem_cache *) arg;
+	struct kmem_cache *cachep = arg;
 	struct array_cache *ac;
 	int node = numa_node_id();
 
@@ -2273,16 +2285,15 @@ int kmem_cache_destroy(struct kmem_cache *cachep)
 
 	/* NUMA: free the list3 structures */
 	for_each_online_node(i) {
-		if ((l3 = cachep->nodelists[i])) {
+		l3 = cachep->nodelists[i];
+		if (l3) {
 			kfree(l3->shared);
 			free_alien_cache(l3->alien);
 			kfree(l3);
 		}
 	}
 	kmem_cache_free(&cache_cache, cachep);
-
 	unlock_cpu_hotplug();
-
 	return 0;
 }
 EXPORT_SYMBOL(kmem_cache_destroy);
@@ -2305,7 +2316,6 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp,
 	slabp->inuse = 0;
 	slabp->colouroff = colour_off;
 	slabp->s_mem = objp + colour_off;
-
 	return slabp;
 }
 
@@ -2333,9 +2343,9 @@ static void cache_init_objs(struct kmem_cache *cachep,
 			*dbg_redzone2(cachep, objp) = RED_INACTIVE;
 		}
 		/*
-		 * Constructors are not allowed to allocate memory from
-		 * the same cache which they are a constructor for.
-		 * Otherwise, deadlock. They must also be threaded.
+		 * Constructors are not allowed to allocate memory from the same
+		 * cache which they are a constructor for.  Otherwise, deadlock.
+		 * They must also be threaded.
 		 */
 		if (cachep->ctor && !(cachep->flags & SLAB_POISON))
 			cachep->ctor(objp + obj_offset(cachep), cachep,
@@ -2349,8 +2359,8 @@ static void cache_init_objs(struct kmem_cache *cachep,
 				slab_error(cachep, "constructor overwrote the"
 					   " start of an object");
 		}
-		if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)
-		    && cachep->flags & SLAB_POISON)
+		if ((cachep->buffer_size % PAGE_SIZE) == 0 &&
+			    OFF_SLAB(cachep) && cachep->flags & SLAB_POISON)
 			kernel_map_pages(virt_to_page(objp),
 					 cachep->buffer_size / PAGE_SIZE, 0);
 #else
@@ -2365,16 +2375,14 @@ static void cache_init_objs(struct kmem_cache *cachep,
 
 static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags)
 {
-	if (flags & SLAB_DMA) {
-		if (!(cachep->gfpflags & GFP_DMA))
-			BUG();
-	} else {
-		if (cachep->gfpflags & GFP_DMA)
-			BUG();
-	}
+	if (flags & SLAB_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, int nodeid)
+static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp,
+				int nodeid)
 {
 	void *objp = index_to_obj(cachep, slabp, slabp->free);
 	kmem_bufctl_t next;
@@ -2390,8 +2398,8 @@ static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, int nod
 	return objp;
 }
 
-static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, void *objp,
-			  int nodeid)
+static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp,
+				void *objp, int nodeid)
 {
 	unsigned int objnr = obj_to_index(cachep, slabp, objp);
 
@@ -2401,7 +2409,7 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, void *ob
 
 	if (slab_bufctl(slabp)[objnr] != BUFCTL_FREE) {
 		printk(KERN_ERR "slab: double free detected in cache "
-		       "'%s', objp %p\n", cachep->name, objp);
+				"'%s', objp %p\n", cachep->name, objp);
 		BUG();
 	}
 #endif
@@ -2410,7 +2418,8 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, void *ob
 	slabp->inuse--;
 }
 
-static void set_slab_attr(struct kmem_cache *cachep, struct slab *slabp, void *objp)
+static void set_slab_attr(struct kmem_cache *cachep, struct slab *slabp,
+			void *objp)
 {
 	int i;
 	struct page *page;
@@ -2438,8 +2447,9 @@ static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid)
 	unsigned long ctor_flags;
 	struct kmem_list3 *l3;
 
-	/* Be lazy and only check for valid flags here,
-	 * keeping it out of the critical path in kmem_cache_alloc().
+	/*
+	 * Be lazy and only check for valid flags here,  keeping it out of the
+	 * critical path in kmem_cache_alloc().
 	 */
 	if (flags & ~(SLAB_DMA | SLAB_LEVEL_MASK | SLAB_NO_GROW))
 		BUG();
@@ -2480,14 +2490,17 @@ static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid)
 	 */
 	kmem_flagcheck(cachep, flags);
 
-	/* Get mem for the objs.
-	 * Attempt to allocate a physical page from 'nodeid',
+	/*
+	 * Get mem for the objs.  Attempt to allocate a physical page from
+	 * 'nodeid'.
 	 */
-	if (!(objp = kmem_getpages(cachep, flags, nodeid)))
+	objp = kmem_getpages(cachep, flags, nodeid);
+	if (!objp)
 		goto failed;
 
 	/* Get slab management. */
-	if (!(slabp = alloc_slabmgmt(cachep, objp, offset, local_flags)))
+	slabp = alloc_slabmgmt(cachep, objp, offset, local_flags);
+	if (!slabp)
 		goto opps1;
 
 	slabp->nodeid = nodeid;
@@ -2506,9 +2519,9 @@ static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid)
 	l3->free_objects += cachep->num;
 	spin_unlock(&l3->list_lock);
 	return 1;
-      opps1:
+opps1:
 	kmem_freepages(cachep, objp);
-      failed:
+failed:
 	if (local_flags & __GFP_WAIT)
 		local_irq_disable();
 	return 0;
@@ -2551,8 +2564,8 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 	page = virt_to_page(objp);
 
 	if (page_get_cache(page) != cachep) {
-		printk(KERN_ERR
-		       "mismatch in kmem_cache_free: expected cache %p, got %p\n",
+		printk(KERN_ERR "mismatch in kmem_cache_free: expected "
+				"cache %p, got %p\n",
 		       page_get_cache(page), cachep);
 		printk(KERN_ERR "%p is %s.\n", cachep, cachep->name);
 		printk(KERN_ERR "%p is %s.\n", page_get_cache(page),
@@ -2562,13 +2575,12 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 	slabp = page_get_slab(page);
 
 	if (cachep->flags & SLAB_RED_ZONE) {
-		if (*dbg_redzone1(cachep, objp) != RED_ACTIVE
-		    || *dbg_redzone2(cachep, objp) != RED_ACTIVE) {
-			slab_error(cachep,
-				   "double free, or memory outside"
-				   " object was overwritten");
-			printk(KERN_ERR
-			       "%p: redzone 1: 0x%lx, redzone 2: 0x%lx.\n",
+		if (*dbg_redzone1(cachep, objp) != RED_ACTIVE ||
+				*dbg_redzone2(cachep, objp) != RED_ACTIVE) {
+			slab_error(cachep, "double free, or memory outside"
+						" object was overwritten");
+			printk(KERN_ERR "%p: redzone 1:0x%lx, "
+					"redzone 2:0x%lx.\n",
 			       objp, *dbg_redzone1(cachep, objp),
 			       *dbg_redzone2(cachep, objp));
 		}
@@ -2584,9 +2596,10 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 	BUG_ON(objp != index_to_obj(cachep, slabp, objnr));
 
 	if (cachep->flags & SLAB_DEBUG_INITIAL) {
-		/* Need to call the slab's constructor so the
-		 * caller can perform a verify of its state (debugging).
-		 * Called without the cache-lock held.
+		/*
+		 * Need to call the slab's constructor so the caller can
+		 * perform a verify of its state (debugging).  Called without
+		 * the cache-lock held.
 		 */
 		cachep->ctor(objp + obj_offset(cachep),
 			     cachep, SLAB_CTOR_CONSTRUCTOR | SLAB_CTOR_VERIFY);
@@ -2599,7 +2612,7 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 	}
 	if (cachep->flags & SLAB_POISON) {
 #ifdef CONFIG_DEBUG_PAGEALLOC
-		if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) {
+		if ((cachep->buffer_size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) {
 			store_stackinfo(cachep, objp, (unsigned long)caller);
 			kernel_map_pages(virt_to_page(objp),
 					 cachep->buffer_size / PAGE_SIZE, 0);
@@ -2625,14 +2638,14 @@ static void check_slabp(struct kmem_cache *cachep, struct slab *slabp)
 			goto bad;
 	}
 	if (entries != cachep->num - slabp->inuse) {
-	      bad:
-		printk(KERN_ERR
-		       "slab: Internal list corruption detected in cache '%s'(%d), slabp %p(%d). Hexdump:\n",
-		       cachep->name, cachep->num, slabp, slabp->inuse);
+bad:
+		printk(KERN_ERR "slab: Internal list corruption detected in "
+				"cache '%s'(%d), slabp %p(%d). Hexdump:\n",
+			cachep->name, cachep->num, slabp, slabp->inuse);
 		for (i = 0;
 		     i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t);
 		     i++) {
-			if ((i % 16) == 0)
+			if (i % 16 == 0)
 				printk("\n%03x:", i);
 			printk(" %02x", ((unsigned char *)slabp)[i]);
 		}
@@ -2654,12 +2667,13 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags)
 
 	check_irq_off();
 	ac = cpu_cache_get(cachep);
-      retry:
+retry:
 	batchcount = ac->batchcount;
 	if (!ac->touched && batchcount > BATCHREFILL_LIMIT) {
-		/* if there was little recent activity on this
-		 * cache, then perform only a partial refill.
-		 * Otherwise we could generate refill bouncing.
+		/*
+		 * If there was little recent activity on this cache, then
+		 * perform only a partial refill.  Otherwise we could generate
+		 * refill bouncing.
 		 */
 		batchcount = BATCHREFILL_LIMIT;
 	}