linux-kernel - Re: gpio-addr-flash warnings on x86/highmem (Re: i386 allmodconfig, current mainline)

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Message-ID: <AANLkTin-CZx1sX7jPcVmW9TrTEKceZSEKrrL-hDt2CEH@mail.gmail.com>
Date:	Mon, 9 Aug 2010 20:12:17 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: gpio-addr-flash warnings on x86/highmem (Re: i386 allmodconfig, 
	current mainline)

On Mon, Aug 9, 2010 at 20:07, Andrew Morton wrote:
> On Mon, 9 Aug 2010 19:52:35 -0400 Mike Frysinger wrote:
>> On Mon, Aug 9, 2010 at 19:43, Andrew Morton wrote:
>> > Guys. __What's goin' on out there?
>> >
>> > drivers/mtd/maps/gpio-addr-flash.c: In function 'gpio_flash_probe':
>> > drivers/mtd/maps/gpio-addr-flash.c:212: warning: cast to pointer from integer of different size
>> > drivers/mtd/maps/gpio-addr-flash.c:224: warning: cast to pointer from integer of different size
>>
>> i did get a bug report about this in the past, but honestly i havent
>> gotten around to fixing the issues.  it's been low priority as my
>> understanding is that the warning shows up in configurations where the
>> driver isnt realistically usable.  not making excuses, just laying out
>> the reality of things.
>
> Casting a resource_size_t to a kernel pointer is plain naughty.

i agree now, but when i wrote the driver, i wasnt aware of these
subtleties when dealing with highmem

> I guess an acceptable "fix" would be to disable to offending combinations
> in Kconfig and add a
>
>        BUILD_BUG_ON(sizeof(gpios->start) != sizeof(void *))
>
> to catch stragglers.

if someone wanted to throw that in now, i wouldnt have a problem with it

> But please do fix warnings, if only because the warning storm from
> allmodconfig causes people to miss important warnings in all the noise.

i try to be proactive with warnings that show up for my arch
(Blackfin), but admittedly i can get a little lazy when i'm not
directly affected

i think i should be able to find time before 2.6.36 to send out a
patch for the issue
-mike
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