slob: clean up the code

- Use NULL instead of plain 0;
- Rename slob_page() to is_slob_page();
- Define slob_page() to convert void* to struct slob_page*;
- Rename slob_new_page() to slob_new_pages();
- Define slob_free_pages() accordingly.

Compile tests only.

Signed-off-by: WANG Cong <wangcong@zeuux.org>
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

diff --git a/mm/slob.c b/mm/slob.c
index bf7e8fc3aed806542e44cc7b1d222d9e2b56dc3a..c9cd31d27e694e764eaf0686df832728d0ece7e6 100644 (file)
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -126,9 +126,9 @@ static LIST_HEAD(free_slob_medium);
 static LIST_HEAD(free_slob_large);
 
 /*
- * slob_page: True for all slob pages (false for bigblock pages)
+ * is_slob_page: True for all slob pages (false for bigblock pages)
  */
-static inline int slob_page(struct slob_page *sp)
+static inline int is_slob_page(struct slob_page *sp)
 {
        return PageSlobPage((struct page *)sp);
 }
@@ -143,6 +143,11 @@ static inline void clear_slob_page(struct slob_page *sp)
        __ClearPageSlobPage((struct page *)sp);
 }
 
+static inline struct slob_page *slob_page(const void *addr)
+{
+       return (struct slob_page *)virt_to_page(addr);
+}
+
 /*
  * slob_page_free: true for pages on free_slob_pages list.
  */
@@ -230,7 +235,7 @@ static int slob_last(slob_t *s)
        return !((unsigned long)slob_next(s) & ~PAGE_MASK);
 }
 
-static void *slob_new_page(gfp_t gfp, int order, int node)
+static void *slob_new_pages(gfp_t gfp, int order, int node)
 {
        void *page;
 
@@ -247,12 +252,17 @@ static void *slob_new_page(gfp_t gfp, int order, int node)
        return page_address(page);
 }
 
+static void slob_free_pages(void *b, int order)
+{
+       free_pages((unsigned long)b, order);
+}
+
 /*
  * Allocate a slob block within a given slob_page sp.
  */
 static void *slob_page_alloc(struct slob_page *sp, size_t size, int align)
 {
-       slob_t *prev, *cur, *aligned = 0;
+       slob_t *prev, *cur, *aligned = NULL;
        int delta = 0, units = SLOB_UNITS(size);
 
        for (prev = NULL, cur = sp->free; ; prev = cur, cur = slob_next(cur)) {
@@ -349,10 +359,10 @@ static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
 
        /* Not enough space: must allocate a new page */
        if (!b) {
-               b = slob_new_page(gfp & ~__GFP_ZERO, 0, node);
+               b = slob_new_pages(gfp & ~__GFP_ZERO, 0, node);
                if (!b)
-                       return 0;
-               sp = (struct slob_page *)virt_to_page(b);
+                       return NULL;
+               sp = slob_page(b);
                set_slob_page(sp);
 
                spin_lock_irqsave(&slob_lock, flags);
@@ -384,7 +394,7 @@ static void slob_free(void *block, int size)
                return;
        BUG_ON(!size);
 
-       sp = (struct slob_page *)virt_to_page(block);
+       sp = slob_page(block);
        units = SLOB_UNITS(size);
 
        spin_lock_irqsave(&slob_lock, flags);
@@ -476,7 +486,7 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
        } else {
                void *ret;
 
-               ret = slob_new_page(gfp | __GFP_COMP, get_order(size), node);
+               ret = slob_new_pages(gfp | __GFP_COMP, get_order(size), node);
                if (ret) {
                        struct page *page;
                        page = virt_to_page(ret);
@@ -494,8 +504,8 @@ void kfree(const void *block)
        if (unlikely(ZERO_OR_NULL_PTR(block)))
                return;
 
-       sp = (struct slob_page *)virt_to_page(block);
-       if (slob_page(sp)) {
+       sp = slob_page(block);
+       if (is_slob_page(sp)) {
                int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
                unsigned int *m = (unsigned int *)(block - align);
                slob_free(m, *m + align);
@@ -513,8 +523,8 @@ size_t ksize(const void *block)
        if (unlikely(block == ZERO_SIZE_PTR))
                return 0;
 
-       sp = (struct slob_page *)virt_to_page(block);
-       if (slob_page(sp)) {
+       sp = slob_page(block);
+       if (is_slob_page(sp)) {
                int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
                unsigned int *m = (unsigned int *)(block - align);
                return SLOB_UNITS(*m) * SLOB_UNIT;
@@ -572,7 +582,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
        if (c->size < PAGE_SIZE)
                b = slob_alloc(c->size, flags, c->align, node);
        else
-               b = slob_new_page(flags, get_order(c->size), node);
+               b = slob_new_pages(flags, get_order(c->size), node);
 
        if (c->ctor)
                c->ctor(b);
@@ -586,7 +596,7 @@ static void __kmem_cache_free(void *b, int size)
        if (size < PAGE_SIZE)
                slob_free(b, size);
        else
-               free_pages((unsigned long)b, get_order(size));
+               slob_free_pages(b, get_order(size));
 }
 
 static void kmem_rcu_free(struct rcu_head *head)