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Commit 03b02939 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
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dm bufio: reorder fields in dm_buffer structure 



Reorder fields in dm_buffer structure to improve packing and reduce
structure size.  The compiler allocates 32-bit integer for field 'enum
data_mode', so change it to unsigned char.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 6b5e718c

drivers/md/dm-bufio.c

+5 −5
Original line number Diff line number Diff line
@@ -147,11 +147,11 @@ struct dm_buffer { 
	struct list_head lru_list;

	sector_t block;

	void *data;

	enum data_mode data_mode;

	unsigned char data_mode;		/* DATA_MODE_* */

	unsigned char list_mode;		/* LIST_* */

	unsigned hold_count;

	blk_status_t read_error;

	blk_status_t write_error;

	unsigned hold_count;

	unsigned long state;

	unsigned long last_accessed;

	unsigned dirty_start;
@@ -303,7 +303,7 @@ static void __remove(struct dm_bufio_client *c, struct dm_buffer *b) 


/*----------------------------------------------------------------*/



static void adjust_total_allocated(enum data_mode data_mode, long diff)

static void adjust_total_allocated(unsigned char data_mode, long diff)

{

	static unsigned long * const class_ptr[DATA_MODE_LIMIT] = {

		&dm_bufio_allocated_kmem_cache,
@@ -368,7 +368,7 @@ static void __cache_size_refresh(void) 
 * space.

 */

static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask,

			       enum data_mode *data_mode)

			       unsigned char *data_mode)

{

	if (unlikely(c->slab_cache != NULL)) {

		*data_mode = DATA_MODE_SLAB;
@@ -408,7 +408,7 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask, 
 * Free buffer's data.

 */

static void free_buffer_data(struct dm_bufio_client *c,

			     void *data, enum data_mode data_mode)

			     void *data, unsigned char data_mode)

{

	switch (data_mode) {

	case DATA_MODE_SLAB: