linux-kernel - Re: [PATCH 2/2] mtd/maps: uclinux: support Blackfin systems

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Date:	Tue, 26 May 2009 12:50:51 -0400
From:	Mike Frysinger <vapier.adi@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>,
	Mike Frysinger <vapier.adi@...il.com>,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Greg Ungerer <gerg@...inux.org>, uclinux-dev@...inux.org,
	linux-mtd@...ts.infradead.org
Subject: Re: [PATCH 2/2] mtd/maps: uclinux: support Blackfin systems

On Tue, May 26, 2009 at 12:47, Paul Mundt wrote:
> On Tue, May 26, 2009 at 12:42:48PM -0400, Mike Frysinger wrote:
>> On Tue, May 26, 2009 at 07:31, Paul Mundt wrote:
>> > On Tue, May 26, 2009 at 05:46:31AM -0400, Mike Frysinger wrote:
>> >> diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c
>> >> index 57699c2..dcb552f 100644
>> >> --- a/drivers/mtd/maps/uclinux.c
>> >> +++ b/drivers/mtd/maps/uclinux.c
>> >> @@ -55,8 +55,13 @@ static int __init uclinux_mtd_init(void)
>> >> ??{
>> >> ?? ?? ?? struct mtd_info *mtd;
>> >> ?? ?? ?? struct map_info *mapp;
>> >> +#ifdef CONFIG_BLACKFIN
>> >> + ?? ?? extern unsigned long memory_mtd_start;
>> >> + ?? ?? unsigned long addr = (unsigned long) memory_mtd_start;
>> >> +#else
>> >> ?? ?? ?? extern char _ebss;
>> >> ?? ?? ?? unsigned long addr = (unsigned long) &_ebss;
>> >> +#endif
>> >>
>> >> ?? ?? ?? mapp = &uclinux_ram_map;
>> >> ?? ?? ?? mapp->phys = addr;
>> >
>> > NAK.
>> >
>> > I know there's no accounting for taste, but it would be nice to at least
>> > see some minimal amount of effort going in to fixing these things
>> > sanely rather than just lazily shoving ifdefs in wherever possible.
>> >
>> > In this case you should just kill all of that crap off, and have the
>> > platforms that use this set uclinux_ram_map up themselves, it's already
>> > a global. Of course you can use _ebss as a default value for
>> > uclinux_ram_map.phys and just override it in your platform.
>>
>> i would agree if it were a board-specific issue, but it's an arch
>> issue, so pushing it to the boards level is wrong.  i can however
>> replace the addr with a global weak and add a symbol into the Blackfin
>> arch code to override it.
>>
> I obviously meant architectures setting up the address, not the board
> code, as this has nothing at all to do with boards. There are already
> plenty of cases in setup_arch() for filling in uclinux mtd data, one more
> isn't going to make a difference.
>
> I don't see anything wrong with keeping uclinux_ram_map as a global
> however, particularly since platforms that need to special case the
> mapping can easily do this under the existing ifdef. Adding weak symbols
> for something like this just seems silly.

the point of the weak symbol was so that the map could provide a sane
default that works for most everyone out there without having to copy
& paste the same code to every arch, and to make new arch porters
worry about what needs to be done to use this very trivial map
-mike
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