linux-kernel - [PATCH 3/7] scsi: acornscsi: mark calc_sync_xfer as __maybe

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Date:	Wed, 27 Jan 2016 16:57:19 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	James.Bottomley@...senPartnership.com
Cc:	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>, linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] scsi: acornscsi: mark calc_sync_xfer as __maybe_unused

The calc_sync_xfer function is only used if CONFIG_SCSI_ACORNSCSI_SYNC
is set, otherwise we get a compiler warning:

scsi/arm/acornscsi.c:680:15: warning: 'calc_sync_xfer' defined but not used [-Wunused-function]
 unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)

This marks the function as __maybe_unused to shut up the
warning and silently drop the function in the object code
when there is no caller.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/scsi/arm/acornscsi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/arm/acornscsi.c b/drivers/scsi/arm/acornscsi.c
index deaaf84989cd..12b88294d667 100644
--- a/drivers/scsi/arm/acornscsi.c
+++ b/drivers/scsi/arm/acornscsi.c
@@ -677,7 +677,8 @@ int round_period(unsigned int period)
  * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
  */
 static
-unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
+unsigned char __maybe_unused calc_sync_xfer(unsigned int period,
+					    unsigned int offset)
 {
     return sync_xfer_table[round_period(period)].reg_value |
 		((offset < SDTR_SIZE) ? offset : SDTR_SIZE);
-- 
2.7.0