Re: [ PATCH v2 00/17] ARM: shmobile: Enable drivers/sh/pm_runtime.c on multi-platform

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Simon,

On Wed, Apr 16, 2014 at 2:18 AM, Simon Horman <horms@verge.net.au> wrote:
>> > This patchset enables the PM runtime code in drivers/sh/pm_runtime.c when
>> > running a multi-platform ARM kernel including support for shmobile.
>> > Before this code was only enabled for legacy shmobile kernels, leading to
>> > disabled clocks in multiplatform kernels, depending on implicit reset state
>> > or on the bootloader.
>> > It also contains some related cleanups, and removals of workarounds.
>
> I am wondering what kind of overhead this introduces for non shmobile
> platforms that use a kernel compiled with ARCH_SHMOBILE_MULTI enabled.

The only overhead for non-shmobile platforms is the compilation of the code,
and the late_initcall(sh_pm_runtime_late_init), which will return immediately.
It's not enabled unless called from a shmobile .init_machine.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds