ata: optimize struct ata_force_param size

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>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index a9a8762..a835d2b 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -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 {

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 350fa58..236e4c5 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -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 */