Reorder fields in dm-buffer, so that it improves packing and reduces
structure size. The compiler allocates 32-bit integer for field 'enum
data_mode', so we change it to unsigned char.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/md/dm-bufio.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
Index: linux-2.6/drivers/md/dm-bufio.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-bufio.c 2018-03-26 17:35:00.149999000 +0200
+++ linux-2.6/drivers/md/dm-bufio.c 2018-03-26 17:35:00.139999000 +0200
@@ -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_cli
/*----------------------------------------------------------------*/
-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
* 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:
--
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