linux-kernel - [PATCH v2 12/26] ata: add CONFIG_SATA_HOST=n version of ata_ncq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200207142734.8431-13-b.zolnierkie@samsung.com>
Date:   Fri,  7 Feb 2020 15:27:20 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Michael Schmitz <schmitzmic@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christoph Hellwig <hch@....de>, linux-ide@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org,
        b.zolnierkie@...sung.com
Subject: [PATCH v2 12/26] ata: add CONFIG_SATA_HOST=n version of
 ata_ncq_enabled()

When CONFIG_SATA_HOST=n there are no NCQ capable host drivers
built so it is safe to hardwire ata_ncq_enabled() to always
return zero.

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

   text    data     bss     dec     hex filename
before:
  37820     572      40   38432    9620 drivers/ata/libata-core.o
  21040     105    4096   25241    6299 drivers/ata/libata-scsi.o
  17405      18       0   17423    440f drivers/ata/libata-eh.o
after:
  37582     572      40   38194    9532 drivers/ata/libata-core.o
  20702     105    4096   24903    6147 drivers/ata/libata-scsi.o
  17353      18       0   17371    43db drivers/ata/libata-eh.o

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
---
 include/linux/libata.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 0f208df6428e..e461664ee0b9 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1631,6 +1631,8 @@ extern struct ata_device *ata_dev_next(struct ata_device *dev,
  */
 static inline int ata_ncq_enabled(struct ata_device *dev)
 {
+	if (!IS_ENABLED(CONFIG_SATA_HOST))
+		return 0;
 	return (dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
 			      ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ;
 }
-- 
2.24.1