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dm bufio: reorder fields in dm_buffer structure

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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: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2018-03-26 20:29:44 +02:00 committed by Mike Snitzer
parent 6b5e718cc1
commit 03b0293959
1 changed files with 5 additions and 5 deletions
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10
drivers/md/dm-bufio.c
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@ -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: