[PATCH v3 3/3] ARM:i.MX: fix the compile warnings in clock-mx51-mx53.c

[Sascha Hauer]

On Thu, Nov 03, 2011 at 03:36:05PM +0800, Jason Liu wrote:
> 2011/11/3 Sascha Hauer <s.hauer at pengutronix.de>:
> > On Wed, Nov 02, 2011 at 07:03:56PM +0800, Jason Liu wrote:
> >> arch/arm/mach-mx5/clock-mx51-mx53.c: In function 'clk_get_freq_dt':
> >> arch/arm/mach-mx5/clock-mx51-mx53.c: In function 'mx53_clocks_init_dt':
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1673: warning: 'ckil' is used uninitialized in this function
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1673: warning: 'osc' is used uninitialized in this function
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1673: warning: 'ckih1' is used uninitialized in this function
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1673: warning: 'ckih2' is used uninitialized in this function
> >> arch/arm/mach-mx5/clock-mx51-mx53.c: In function 'mx51_clocks_init_dt':
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1665: warning: 'ckil' is used uninitialized in this function
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1665: warning: 'osc' is used uninitialized in this function
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1665: warning: 'ckih1' is used uninitialized in this function
> >> arch/arm/mach-mx5/clock-mx51-mx53.c:1665: warning: 'ckih2' is used uninitialized in this function
> >
> > You only get this warning because you have put the code in
> > clk_get_freq_dt into #ifdef CONFIG_OF in the last patch. Instead please
> > put the whole block including clk_get_freq_dt, mx51_clocks_init_dt and
> > mx53_clocks_init_dt into #ifdef CONFIG_OF.
> 
> Yes, I can put #ifdef CONFIG_OF to cover the whole block including
> clk_get_freq_dt/
> mx51_clocks_init_dt/mx53_clocks_init_dt, but after enable CONFIG_OF,
> you still will
> meet these compiling warnings.

I just tried it and no, I do not get any compiler warnings.

When passing the address of a variable to a function gcc considers this
variable as initialized after that, unless the function is a static
inline function and gcc can see that it actually does not get
initialized.
I hope this hasn't changed with gcc 4.6

> 
> But refer to grant before, we don't need place #ifdef CONFIG_OF #endif into
> the .c file, no-matter enable device_tree support or not. I'm not sure
> why we still
> meet compile error, shawn, any comments?

for_each_compatible_node is inside #ifdef CONFIG_OF in the header file.
So unless there are plans to provide some dummy stub for this without
CONFIG_OF I see no way around these ifdefs.

> 
> Jason Liu
> 
> > Sascha
> >
> >>
> >> Signed-off-by: Jason Liu <jason.hui at linaro.org>
> >> ---
> >>  arch/arm/mach-mx5/clock-mx51-mx53.c |    2 ++
> >>  1 files changed, 2 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
> >> index 7c373b83..e352a5a 100644
> >> --- a/arch/arm/mach-mx5/clock-mx51-mx53.c
> >> +++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
> >> @@ -1662,6 +1662,7 @@ int __init mx51_clocks_init_dt(void)
> >>  {
> >>       unsigned long ckil, osc, ckih1, ckih2;
> >>
> >> +     ckil = osc = ckih1 = ckih2 = 0;
> >>       clk_get_freq_dt(&ckil, &osc, &ckih1, &ckih2);
> >>       return mx51_clocks_init(ckil, osc, ckih1, ckih2);
> >>  }
> >> @@ -1670,6 +1671,7 @@ int __init mx53_clocks_init_dt(void)
> >>  {
> >>       unsigned long ckil, osc, ckih1, ckih2;
> >>
> >> +     ckil = osc = ckih1 = ckih2 = 0;
> >>       clk_get_freq_dt(&ckil, &osc, &ckih1, &ckih2);
> >>       return mx53_clocks_init(ckil, osc, ckih1, ckih2);
> >>  }
> >> --
> >> 1.7.4.1
> >>
> >>
> >>
> >
> > --
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> 

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