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SubjectRe: [PATCH] ARM: shmobile: cpuidle: Remove the pointless default driver
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Hi Daniel,

On Tue, Mar 17, 2015 at 3:34 PM, Daniel Lezcano
<daniel.lezcano@linaro.org> wrote:
> The default idle driver uses one state with the WFI instruction.
> The default idle routine invokes WFI when no cpuidle driver is present.
>
> The default cpuidle driver is pointless and does not give more than the
> default idle routine and moreover it pulls all the mathematics tied with
> the cpuidle governor for nothing, hence consuming more energy.
>
> Remove the default driver, the related code and register the driver directly.

Thanks for your patch!

> [compiled only - no board - no test]
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
> arch/arm/mach-shmobile/common.h | 3 ---
> arch/arm/mach-shmobile/cpuidle.c | 37 -------------------------------------
> arch/arm/mach-shmobile/pm-sh7372.c | 2 +-
> 3 files changed, 1 insertion(+), 41 deletions(-)
>
> diff --git a/arch/arm/mach-shmobile/common.h b/arch/arm/mach-shmobile/common.h
> index 309025e..29b3088 100644
> --- a/arch/arm/mach-shmobile/common.h
> +++ b/arch/arm/mach-shmobile/common.h
> @@ -23,8 +23,6 @@ struct clk;
> extern int shmobile_clk_init(void);
> extern void shmobile_handle_irq_intc(struct pt_regs *);
> extern struct platform_suspend_ops shmobile_suspend_ops;
> -struct cpuidle_driver;
> -extern void shmobile_cpuidle_set_driver(struct cpuidle_driver *drv);
>
> #ifdef CONFIG_SUSPEND
> int shmobile_suspend_init(void);
> @@ -51,7 +49,6 @@ extern void __iomem *shmobile_scu_base;
> static inline void __init shmobile_init_late(void)
> {
> shmobile_suspend_init();
> - shmobile_cpuidle_init();

Please remove the forward declaration and dummy for shmobile_cpuidle_init()
above, too.

> shmobile_cpufreq_init();
> }
>
> diff --git a/arch/arm/mach-shmobile/cpuidle.c b/arch/arm/mach-shmobile/cpuidle.c
> index 0afeb5c..e69de29 100644
> --- a/arch/arm/mach-shmobile/cpuidle.c
> +++ b/arch/arm/mach-shmobile/cpuidle.c
> @@ -1,37 +0,0 @@

If you remove this file, you should remove its entry from
arch/arm/mach-shmobile/Makefile, too.
(did you use a config with CONFIG_CPU_IDLE=n?).

> diff --git a/arch/arm/mach-shmobile/pm-sh7372.c b/arch/arm/mach-shmobile/pm-sh7372.c
> index c0293ae..9f19052 100644
> --- a/arch/arm/mach-shmobile/pm-sh7372.c
> +++ b/arch/arm/mach-shmobile/pm-sh7372.c

Support for sh7372 is scheduled for removal in v4.1, so this will become
a no-op.

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


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