On Fri, Jan 10, 2014 at 10:25:54AM +0000, David Laight wrote:
> From: Peter Chen
> ...
> > +#ifdef
> > +static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
> > +{
> > + __asm__ ("swp %0, %0, [%1]" : : "r"(val), "r"(addr));
> > +}
> > +#else
> > +static inline void imx28_ci_writel(u32 val, volatile void __iomem *addr)
> > +{
> > +}
> > +#endif
> > +
> > +static inline void __hw_write(struct ci_hdrc *ci, u32 val,
> > + void __iomem *addr)
> > +{
> > + if (ci->imx28_write_fix)
> > + imx28_ci_writel(val, addr);
> > + else
> > + iowrite32(val, addr);
> > +}
> > +
>
> This code ought to be defensive against 'imx28_write_fix' being
> set when the kernel isn't compiled with CONFIG_SOC_IMX28.
> This can easily be done by changing the #else block to do an iowrite().
You missed the long email thread we just had about this earlier in the
week...
> It is worth looking to see if the compiler manages to optimise away
> the 'if' test in this case. It might do better if a #define is used
> instead of the inline function.
It shouldn't make a difference, gcc should optimize it away.
thanks,
greg k-h
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