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

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Message-ID: <CACna6rwjMfTT4UgbyO=VmLaPic4xGcPxoMEL5yRmLW7hhvhXJQ@mail.gmail.com>
Date:	Wed, 4 Nov 2015 10:04:26 +0100
From:	Rafał Miłecki <zajec5@...il.com>
To:	Javier Martinez Canillas <javier@....samsung.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Luis de Bethencourt <luisbg@....samsung.com>,
	Jeremy Kerr <jk@...abs.org>,
	Neelesh Gupta <neelegup@...ux.vnet.ibm.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Brian Norris <computersforpeace@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Cyril Bur <cyrilbur@...il.com>
Subject: Re: [PATCH] mtd: Make MTD_BCM47XXSFLASH to depend on MIPS

On 14 October 2015 at 11:04, Javier Martinez Canillas
<javier@....samsung.com> wrote:
> 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),

I think we're not really supposed to use KSEG0ADDR anyway. What about
replacing it with ioremap_nocache?

Sorry for the late reply.
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