linux-kernel - [PATCH] mtd: Make MTD_BCM47XXSFLASH to depend on MIPS

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Message-Id: <1444813494-14985-1-git-send-email-javier@osg.samsung.com>
Date:	Wed, 14 Oct 2015 11:04:54 +0200
From:	Javier Martinez Canillas <javier@....samsung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Luis de Bethencourt <luisbg@....samsung.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Jeremy Kerr <jk@...abs.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>,
	Cyril Bur <cyrilbur@...il.com>
Subject: [PATCH] mtd: Make MTD_BCM47XXSFLASH to depend on MIPS

The bcm47xxsflash driver uses the KSEG0ADDR() function to map an address
to a certain kernel segment. But that is only defined if the MIPS config
symbol is enabled. The driver does not have an explicit dependency on it
and relies on a transitive dependency relation:

MTD_BCM47XXSFLASH -> BCMA_SFLASH -> BCMA_DRIVER_MIPS -> BCMA && MIPS

But BCMA_SFLASH and BCMA_DRIVER_MIPS have only runtime and not buildtime
dependency with MIPS so can be changed to be built test using the config
COMPILE_TEST symbol. But that would make MTD_BCM47XXSFLASH be built with
MIPS not enabled and cause the following build error:

drivers/mtd/devices//bcm47xxsflash.c: In function 'bcm47xxsflash_read':
drivers/mtd/devices//bcm47xxsflash.c:112:2: error: implicit declaration of function 'KSEG0ADDR' [-Werror=implicit-function-declaration]
  memcpy_fromio(buf, (void __iomem *)KSEG0ADDR(b47s->window + from),
  ^

Make MTD_BCM47XXSFLASH depend on MIPS since has a buildtime dependency.

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>

---

 drivers/mtd/devices/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig
index f73c41697a00..f5eab3c19356 100644
--- a/drivers/mtd/devices/Kconfig
+++ b/drivers/mtd/devices/Kconfig
@@ -114,7 +114,7 @@ config MTD_SST25L
 
 config MTD_BCM47XXSFLASH
 	tristate "R/O support for serial flash on BCMA bus"
-	depends on BCMA_SFLASH
+	depends on BCMA_SFLASH && MIPS
 	help
 	  BCMA bus can have various flash memories attached, they are
 	  registered by bcma as platform devices. This enables driver for
-- 
2.4.3

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