linux-kernel - Re: [PATCH -next] mtd: fsl-quadspi: Never build on SPARC

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Date:	Fri, 23 Oct 2015 09:53:24 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Han Xu <xhnjupt@...il.com>
Cc:	Brian Norris <computersforpeace@...il.com>,
	Han Xu <b45815@...escale.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] mtd: fsl-quadspi: Never build on SPARC

On 10/23/2015 09:31 AM, Han Xu wrote:
> On Thu, Oct 22, 2015 at 8:13 PM, Guenter Roeck <linux@...ck-us.net> wrote:
>> On 10/22/2015 06:07 PM, Brian Norris wrote:
>>>
>>> + Han
>>>
>>> On Wed, Oct 21, 2015 at 07:31:46AM -0700, Guenter Roeck wrote:
>>>>
>>>> Attempts to build fsl-quadspi on SPARC fail with
>>>>
>>>> drivers/mtd/spi-nor/fsl-quadspi.c: In function 'fsl_qspi_init_lut':
>>>> drivers/mtd/spi-nor/fsl-quadspi.c:369:1: error:
>>>>          'LUT_0' undeclared (first use in this function)
>>>> drivers/mtd/spi-nor/fsl-quadspi.c:418:1: error:
>>>>          pasting "LUT_" and "(" does not give a valid preprocessing token
>>>> drivers/mtd/spi-nor/fsl-quadspi.c:418:2: error:
>>>>          implicit declaration of function 'LUT_'
>>>
>>>
>>> I don't think this is only a SPARC problem. The macro concatenation is
>>> generally suspect.
>>>
>>> I see that READ and WRITE are problems at least. If something like
>>> <linux/fs.h> gets included somehow, then these tokens resolve to
>>> integers or expressions before they fall through to literal
>>> concatentation, so we get 'LUT_0' or 'LUT_(1ULL << __REQ_WRITE)' instead
>>> of 'LUT_READ' and 'LUT_WRITE'.
> Hi Brian
> We have two options, either undef READ and WRITE before these macros
> or change the LUT_READ to LUT_FSLREAD and same as WRITE. So what's
> your opinion? Thanks.

Undef sounds like a really bad solution to me.

Guenter

>>>
>> You are right, that deserves a better fix. I'll leave it up to you.
>>
>> Thanks,
>> Guenter
>>
>>
>>
>> ______________________________________________________
>> Linux MTD discussion mailing list
>> http://lists.infradead.org/mailman/listinfo/linux-mtd/
>

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