On Fri, Jan 10, 2014 at 03:09:03PM +0000, David Laight wrote: > > > 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... > > No - I read most of it, I even commented earlier than the alternate > definition of imx28_ci_writel() should be iowrite32(). That would work too. > Getting static branch prediction right can make a significant difference. > Although each branch is only a few clocks they can soon add up. > Protocol stack code can easily be dominated by conditionals, > removing pipeline stalls can easily speed things up by a measurable 10%. If you can measure a problem with the code as-is, great, I'll be glad to take a patch, otherwise we are just bike-shedding, and I'm sure the gcc developers would love a bug report as to how they aren't getting the static inline empty function logic correct :) thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
