AcoSail/kernel_optimize_test
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ata: optimize struct ata_force_param size

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Optimize struct ata_force_param size by:
- using u8 for cbl and spd_limit fields
- using u16 for lflags field

Code size savings on m68k arch using (modified) atari_defconfig:

   text    data     bss     dec     hex filename
before:
  41064     573      40   41677    a2cd drivers/ata/libata-core.o
after:
  40654     573      40   41267    a133 drivers/ata/libata-core.o

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2020-03-26 16:58:02 +01:00 committed by Jens Axboe
parent bbf5a0976d
commit 8ba5a45c99
2 changed files with 4 additions and 3 deletions
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6
drivers/ata/libata-core.c
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@ -90,12 +90,12 @@ atomic_t ata_print_id = ATOMIC_INIT(0);
struct ata_force_param {
const char *name;
unsigned int cbl;
int spd_limit;
u8 cbl;
u8 spd_limit;
unsigned long xfer_mask;
unsigned int horkage_on;
unsigned int horkage_off;
unsigned int lflags;
u16 lflags;
};
struct ata_force_ent {

1
include/linux/libata.h
View File

@ -174,6 +174,7 @@ enum {
ATA_DEV_NONE = 11, /* no device */
/* struct ata_link flags */
/* NOTE: struct ata_force_param currently stores lflags in u16 */
ATA_LFLAG_NO_HRST = (1 << 1), /* avoid hardreset */
ATA_LFLAG_NO_SRST = (1 << 2), /* avoid softreset */
ATA_LFLAG_ASSUME_ATA = (1 << 3), /* assume ATA class */