[alsa-devel] [PATCH] ASoC: prevent compilers from optimising pll calculation into __aeabi__uldivmod

[Barry Song]

2011/4/27 Mark Brown <broonie at opensource.wolfsonmicro.com>
>
> On Wed, Apr 27, 2011 at 04:50:12PM +0800, Barry Song wrote:
>
> > Marking pll_factors() as noinline or putting asm("" : "+r"(source)); before the
> > call to do_div() works around the problem.
>
> If we do have to do something in the callers rather than in do_div() the
> annotation seems substantially more taseful than inserting a random asm
> into the code.
I agree. for this patch which will not be applied, people can just get
information about how to workaround the gcc issue while they have the
same problem. google can find there are other people who failed to
compile wm8974 module too. eg.
http://irclogs.ubuntu.com/2010/03/30/%23ubuntu-arm.txt

Andrew Stubbs, Michael Hope in Linaro's toolchain team are working
hard on this gcc issue. there have been many update today:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48783