[PATCH v4 14/27] ata: let compiler optimize out ata_dev_config_ncq() on non-SATA hosts

[Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>]

Add !IS_ENABLED(CONFIG_SATA_HOST) to ata_dev_config_ncq() to allow
compiler to optimize out the function for non-SATA configs.

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

   text    data     bss     dec     hex filename
before:
  37582     572      40   38194    9532 drivers/ata/libata-core.o
after:
  36462     572      40   37074    90d2 drivers/ata/libata-core.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
---
 drivers/ata/libata-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f88fa4db2cab..fa1fd0735321 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2301,6 +2301,8 @@ static int ata_dev_config_ncq(struct ata_device *dev,
 		desc[0] = '\0';
 		return 0;
 	}
+	if (!IS_ENABLED(CONFIG_SATA_HOST))
+		return 0;
 	if (dev->horkage & ATA_HORKAGE_NONCQ) {
 		snprintf(desc, desc_sz, "NCQ (not used)");
 		return 0;
-- 
2.24.1