From: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Date: Thu, 26 Mar 2020 15:58:03 +0000 (+0100)
Subject: ata: optimize ata_scsi_rbuf[] size
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c8fa4f8e22d1308179dfe17abb00d3aebbcb7410;p=openwrt%2Fstaging%2Fblogic.git

ata: optimize ata_scsi_rbuf[] size

Currently the maximum required size of the ata_scsi_rbuf[] is
576 bytes in ata_scsiop_inq_89() so modify ATA_SCSI_RBUF_SIZE
define accordingly.

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

   text    data     bss     dec     hex filename
before:
  20782     105    4096   24983    6197 drivers/ata/libata-scsi.o
after:
  20782     105     576   21463    53d7 drivers/ata/libata-scsi.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-scsi.c b/drivers/ata/libata-scsi.c
index 0912acb82b80..c2b8428dfb94 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -37,7 +37,7 @@
 #include "libata.h"
 #include "libata-transport.h"
 
-#define ATA_SCSI_RBUF_SIZE	4096
+#define ATA_SCSI_RBUF_SIZE	576
 
 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];