mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
e244c9e66f
All occurrences of mempools based on slab caches with object constructors have been removed from the tree, so disallow creating them. We can only dereference mem->ctor in mm/mempool.c without including mm/slab.h in include/linux/mempool.h. So simply note the restriction, just like the comment restricting usage of __GFP_ZERO, and warn on kernels with CONFIG_DEBUG_VM() if such a mempool is allocated from. We don't want to incur this check on every element allocation, so use VM_BUG_ON(). Signed-off-by: David Rientjes <rientjes@google.com> Cc: Dave Kleikamp <shaggy@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Sebastian Ott <sebott@linux.vnet.ibm.com> Cc: Mikulas Patocka <mpatocka@redhat.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
|
|
* memory buffer pool support
|
|
*/
|
|
#ifndef _LINUX_MEMPOOL_H
|
|
#define _LINUX_MEMPOOL_H
|
|
|
|
#include <linux/wait.h>
|
|
|
|
struct kmem_cache;
|
|
|
|
typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
|
|
typedef void (mempool_free_t)(void *element, void *pool_data);
|
|
|
|
typedef struct mempool_s {
|
|
spinlock_t lock;
|
|
int min_nr; /* nr of elements at *elements */
|
|
int curr_nr; /* Current nr of elements at *elements */
|
|
void **elements;
|
|
|
|
void *pool_data;
|
|
mempool_alloc_t *alloc;
|
|
mempool_free_t *free;
|
|
wait_queue_head_t wait;
|
|
} mempool_t;
|
|
|
|
extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
|
|
mempool_free_t *free_fn, void *pool_data);
|
|
extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
|
|
mempool_free_t *free_fn, void *pool_data,
|
|
gfp_t gfp_mask, int nid);
|
|
|
|
extern int mempool_resize(mempool_t *pool, int new_min_nr);
|
|
extern void mempool_destroy(mempool_t *pool);
|
|
extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
|
|
extern void mempool_free(void *element, mempool_t *pool);
|
|
|
|
/*
|
|
* A mempool_alloc_t and mempool_free_t that get the memory from
|
|
* a slab cache that is passed in through pool_data.
|
|
* Note: the slab cache may not have a ctor function.
|
|
*/
|
|
void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
|
|
void mempool_free_slab(void *element, void *pool_data);
|
|
static inline mempool_t *
|
|
mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
|
|
{
|
|
return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
|
|
(void *) kc);
|
|
}
|
|
|
|
/*
|
|
* a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
|
|
* amount of memory specified by pool_data
|
|
*/
|
|
void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
|
|
void mempool_kfree(void *element, void *pool_data);
|
|
static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
|
|
{
|
|
return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
|
|
(void *) size);
|
|
}
|
|
|
|
/*
|
|
* A mempool_alloc_t and mempool_free_t for a simple page allocator that
|
|
* allocates pages of the order specified by pool_data
|
|
*/
|
|
void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
|
|
void mempool_free_pages(void *element, void *pool_data);
|
|
static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
|
|
{
|
|
return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
|
|
(void *)(long)order);
|
|
}
|
|
|
|
#endif /* _LINUX_MEMPOOL_H */
|