[PATCH] Cleanup slab headers / API to allow easy addition of new slab allocators
This is a response to an earlier discussion on linux-mm about splitting
slab.h components per allocator. Patch is against 2.6.19-git11. See
http://marc.theaimsgroup.com/?l=linux-mm&m=116469577431008&w=2
This patch cleans up the slab header definitions. We define the common
functions of slob and slab in slab.h and put the extra definitions needed
for slab's kmalloc implementations in <linux/slab_def.h>. In order to get
a greater set of common functions we add several empty functions to slob.c
and also rename slob's kmalloc to __kmalloc.
Slob does not need any special definitions since we introduce a fallback
case. If there is no need for a slab implementation to provide its own
kmalloc mess^H^H^Hacros then we simply fall back to __kmalloc functions.
That is sufficient for SLOB.
Sort the function in slab.h according to their functionality. First the
functions operating on struct kmem_cache * then the kmalloc related
functions followed by special debug and fallback definitions.
Also redo a lot of comments.
Signed-off-by: Christoph Lameter <clameter@sgi.com>?
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/slob.c b/mm/slob.c
index 5423941..b90091c 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -157,7 +157,7 @@
return order;
}
-void *kmalloc(size_t size, gfp_t gfp)
+void *__kmalloc(size_t size, gfp_t gfp)
{
slob_t *m;
bigblock_t *bb;
@@ -186,8 +186,7 @@
slob_free(bb, sizeof(bigblock_t));
return 0;
}
-
-EXPORT_SYMBOL(kmalloc);
+EXPORT_SYMBOL(__kmalloc);
void kfree(const void *block)
{
@@ -329,6 +328,17 @@
static struct timer_list slob_timer = TIMER_INITIALIZER(
(void (*)(unsigned long))kmem_cache_init, 0, 0);
+int kmem_cache_shrink(struct kmem_cache *d)
+{
+ return 0;
+}
+EXPORT_SYMBOL(kmem_cache_shrink);
+
+int kmem_ptr_validate(struct kmem_cache *a, void *b)
+{
+ return 0;
+}
+
void kmem_cache_init(void)
{
void *p = slob_alloc(PAGE_SIZE, 0, PAGE_SIZE-1);