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authorMikulas Patocka <mpatocka@redhat.com>2018-03-26 20:29:44 +0200
committerMike Snitzer <snitzer@redhat.com>2018-04-03 15:04:26 -0400
commit03b02939593700caf391dc02b86b23b0d7aac2e5 (patch)
tree424b671b5221767dedbdd6d6caa2426afb380e9f /drivers/md
parent6b5e718cc138ef691e91685535e3ba776acc4893 (diff)
downloadlinux-03b02939593700caf391dc02b86b23b0d7aac2e5.tar.bz2
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: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/dm-bufio.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index c57aefb3c643..776075ccf775 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -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: