From: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Date: Thu, 26 Mar 2020 16:58:10 +0100
Subject: [PATCH] ata: let compiler optimize out ata_eh_set_lpm() on non-SATA
hosts
Git-commit: 4c9029e7d00f31923bcecbaab6a12ba52017924e
Patch-mainline: v5.7-rc1
References: bsc#1175995,jsc#SLE-15608
Add !IS_ENABLED(CONFIG_SATA_HOST) to ata_eh_set_lpm() to allow
compiler to optimize out the function for non-SATA configs (for
PATA hosts "ap && !ap->ops->set_lpm" condition is always true so
it's sufficient for the function to return zero).
Code size savings on m68k arch using (modified) atari_defconfig:
text data bss dec hex filename
before:
17353 18 0 17371 43db drivers/ata/libata-eh.o
after:
16607 18 0 16625 40f1 drivers/ata/libata-eh.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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/ata/libata-eh.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 04275f4c8d36..8dc33b6832f0 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3443,7 +3443,8 @@ static int ata_eh_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
int rc;
/* if the link or host doesn't do LPM, noop */
- if ((link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
+ if (!IS_ENABLED(CONFIG_SATA_HOST) ||
+ (link->flags & ATA_LFLAG_NO_LPM) || (ap && !ap->ops->set_lpm))
return 0;
/*
--
2.16.4