[PATCH] slab: stop using list_for_each

Use the _entry variant everywhere to clean the code up a tiny bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/slab.c b/mm/slab.c
index 7bd1963..54bd2eb 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1950,8 +1950,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
        void (*dtor)(void*, struct kmem_cache *, unsigned long))
 {
        size_t left_over, slab_size, ralign;
-       struct kmem_cache *cachep = NULL;
-       struct list_head *p;
+       struct kmem_cache *cachep = NULL, *pc;
 
        /*
         * Sanity checks... these are all serious usage bugs.
@@ -1971,8 +1970,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
 
        mutex_lock(&cache_chain_mutex);
 
-       list_for_each(p, &cache_chain) {
-               struct kmem_cache *pc = list_entry(p, struct kmem_cache, next);
+       list_for_each_entry(pc, &cache_chain, next) {
                mm_segment_t old_fs = get_fs();
                char tmp;
                int res;
@@ -3690,7 +3688,7 @@ void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3,
  */
 static void cache_reap(void *unused)
 {
-       struct list_head *walk;
+       struct kmem_cache *searchp;
        struct kmem_list3 *l3;
        int node = numa_node_id();
 
@@ -3701,13 +3699,11 @@ static void cache_reap(void *unused)
                return;
        }
 
-       list_for_each(walk, &cache_chain) {
-               struct kmem_cache *searchp;
+       list_for_each_entry(searchp, &cache_chain, next) {
                struct list_head *p;
                int tofree;
                struct slab *slabp;
 
-               searchp = list_entry(walk, struct kmem_cache, next);
                check_irq_on();
 
                /*
@@ -3835,7 +3831,6 @@ static void s_stop(struct seq_file *m, void *p)
 static int s_show(struct seq_file *m, void *p)
 {
        struct kmem_cache *cachep = p;
-       struct list_head *q;
        struct slab *slabp;
        unsigned long active_objs;
        unsigned long num_objs;
@@ -3856,15 +3851,13 @@ static int s_show(struct seq_file *m, void *p)
                check_irq_on();
                spin_lock_irq(&l3->list_lock);
 
-               list_for_each(q, &l3->slabs_full) {
-                       slabp = list_entry(q, struct slab, list);
+               list_for_each_entry(slabp, &l3->slabs_full, list) {
                        if (slabp->inuse != cachep->num && !error)
                                error = "slabs_full accounting error";
                        active_objs += cachep->num;
                        active_slabs++;
                }
-               list_for_each(q, &l3->slabs_partial) {
-                       slabp = list_entry(q, struct slab, list);
+               list_for_each_entry(slabp, &l3->slabs_partial, list) {
                        if (slabp->inuse == cachep->num && !error)
                                error = "slabs_partial inuse accounting error";
                        if (!slabp->inuse && !error)
@@ -3872,8 +3865,7 @@ static int s_show(struct seq_file *m, void *p)
                        active_objs += slabp->inuse;
                        active_slabs++;
                }
-               list_for_each(q, &l3->slabs_free) {
-                       slabp = list_entry(q, struct slab, list);
+               list_for_each_entry(slabp, &l3->slabs_free, list) {
                        if (slabp->inuse && !error)
                                error = "slabs_free/inuse accounting error";
                        num_slabs++;
@@ -3966,7 +3958,7 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer,
 {
        char kbuf[MAX_SLABINFO_WRITE + 1], *tmp;
        int limit, batchcount, shared, res;
-       struct list_head *p;
+       struct kmem_cache *cachep;
 
        if (count > MAX_SLABINFO_WRITE)
                return -EINVAL;
@@ -3985,10 +3977,7 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer,
        /* Find the cache in the chain of caches. */
        mutex_lock(&cache_chain_mutex);
        res = -EINVAL;
-       list_for_each(p, &cache_chain) {
-               struct kmem_cache *cachep;
-
-               cachep = list_entry(p, struct kmem_cache, next);
+       list_for_each_entry(cachep, &cache_chain, next) {
                if (!strcmp(cachep->name, kbuf)) {
                        if (limit < 1 || batchcount < 1 ||
                                        batchcount > limit || shared < 0) {
@@ -4090,7 +4079,6 @@ static void show_symbol(struct seq_file *m, unsigned long address)
 static int leaks_show(struct seq_file *m, void *p)
 {
        struct kmem_cache *cachep = p;
-       struct list_head *q;
        struct slab *slabp;
        struct kmem_list3 *l3;
        const char *name;
@@ -4115,14 +4103,10 @@ static int leaks_show(struct seq_file *m, void *p)
                check_irq_on();
                spin_lock_irq(&l3->list_lock);
 
-               list_for_each(q, &l3->slabs_full) {
-                       slabp = list_entry(q, struct slab, list);
+               list_for_each_entry(slabp, &l3->slabs_full, list)
                        handle_slab(n, cachep, slabp);
-               }
-               list_for_each(q, &l3->slabs_partial) {
-                       slabp = list_entry(q, struct slab, list);
+               list_for_each_entry(slabp, &l3->slabs_partial, list)
                        handle_slab(n, cachep, slabp);
-               }
                spin_unlock_irq(&l3->list_lock);
        }
        name = cachep->name;