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Message-id: <1423120340.29408.0.camel@AMDC1943>
Date: Thu, 05 Feb 2015 08:12:20 +0100
From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
To: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
Kukjin Kim <kgene@...nel.org>,
"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Marek Szyprowski <m.szyprowski@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH] ARM: EXYNOS: cpuidle: Fix build breakage on !SMP
On śro, 2015-02-04 at 19:07 +0100, Bartlomiej Zolnierkiewicz wrote:
> Hi,
>
> On Wednesday, February 04, 2015 11:27:26 AM Krzysztof Kozlowski wrote:
> > The Exynos cpuidle driver has coupled cpuidle built-in so it cannot be
> > built without SMP:
> >
> > arch/arm/mach-exynos/pm.c: In function ‘exynos_cpu0_enter_aftr’:
> > arch/arm/mach-exynos/pm.c:246:4: error: implicit declaration of function ‘arch_send_wakeup_ipi_mask’ [-Werror=implicit-function-declaration]
> > arch/arm/mach-exynos/built-in.o: In function `exynos_pre_enter_aftr':
> > ../arch/arm/mach-exynos/pm.c:300: undefined reference to `cpu_boot_reg_base'
> > arch/arm/mach-exynos/built-in.o: In function `exynos_cpu1_powerdown':
> > ../arch/arm/mach-exynos/pm.c:282: undefined reference to `exynos_cpu_power_down'
> >
> > Make the cpuidle driver depending on SMP because this will be the
> > fastest way to fix build break without adding a bunch of ifdefs in few
> > places.
>
> There shouldn't be a lot of new ifdefs (please see below) and I would
> very much prefer for cpuidle to stay supported also on UP kernels.
Sure, I'm fine with your patch.
Best regards,
Krzysztof
>
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> > ---
> > arch/arm/mach-exynos/pm.c | 2 ++
> > drivers/cpuidle/Kconfig.arm | 3 ++-
> > 2 files changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
> > index e6209dadc00d..17db00ff7f3a 100644
> > --- a/arch/arm/mach-exynos/pm.c
> > +++ b/arch/arm/mach-exynos/pm.c
> > @@ -181,6 +181,7 @@ void exynos_enter_aftr(void)
> > cpu_pm_exit();
> > }
> >
> > +#ifdef CONFIG_ARM_EXYNOS_CPUIDLE
> > static atomic_t cpu1_wakeup = ATOMIC_INIT(0);
> >
> > static int exynos_cpu0_enter_aftr(void)
> > @@ -302,3 +303,4 @@ struct cpuidle_exynos_data cpuidle_coupled_exynos_data = {
> > .pre_enter_aftr = exynos_pre_enter_aftr,
> > .post_enter_aftr = exynos_post_enter_aftr,
> > };
> > +#endif /* CONFIG_ARM_EXYNOS_CPUIDLE */
> > diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
> > index 8e07c9419153..5eb86a4f74d9 100644
> > --- a/drivers/cpuidle/Kconfig.arm
> > +++ b/drivers/cpuidle/Kconfig.arm
> > @@ -55,7 +55,8 @@ config ARM_AT91_CPUIDLE
> > config ARM_EXYNOS_CPUIDLE
> > bool "Cpu Idle Driver for the Exynos processors"
> > depends on ARCH_EXYNOS
> > - select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
> > + depends on SMP
> > + select ARCH_NEEDS_CPU_IDLE_COUPLED
> > help
> > Select this to enable cpuidle for Exynos processors
>
> How's about the patch below instead? It builds fine for UP and SMP.
> I will do more testing tomorrow (unfortunately it seems that something
> else broke Origen4210 in -next).
>
> From: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Subject: [PATCH] ARM: EXYNOS: cpuidle: Fix build breakage on !SMP
>
> The Exynos cpuidle driver has coupled cpuidle built-in so it cannot be
> built without SMP:
>
> arch/arm/mach-exynos/pm.c: In function ‘exynos_cpu0_enter_aftr’:
> arch/arm/mach-exynos/pm.c:246:4: error: implicit declaration of function ‘arch_send_wakeup_ipi_mask’ [-Werror=implicit-function-declaration]
> arch/arm/mach-exynos/built-in.o: In function `exynos_pre_enter_aftr':
> ../arch/arm/mach-exynos/pm.c:300: undefined reference to `cpu_boot_reg_base'
> arch/arm/mach-exynos/built-in.o: In function `exynos_cpu1_powerdown':
> ../arch/arm/mach-exynos/pm.c:282: undefined reference to `exynos_cpu_power_down'
>
> Fix it by adding missing checks for SMP.
>
> Reported-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
> arch/arm/mach-exynos/exynos.c | 2 +-
> arch/arm/mach-exynos/pm.c | 2 ++
> drivers/cpuidle/cpuidle-exynos.c | 3 ++-
> 3 files changed, 5 insertions(+), 2 deletions(-)
>
> Index: b/arch/arm/mach-exynos/exynos.c
> ===================================================================
> --- a/arch/arm/mach-exynos/exynos.c 2015-02-04 18:30:23.555819717 +0100
> +++ b/arch/arm/mach-exynos/exynos.c 2015-02-04 18:43:23.539807815 +0100
> @@ -211,7 +211,7 @@ static void __init exynos_dt_machine_ini
> if (!IS_ENABLED(CONFIG_SMP))
> exynos_sysram_init();
>
> -#ifdef CONFIG_ARM_EXYNOS_CPUIDLE
> +#if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
> if (of_machine_is_compatible("samsung,exynos4210"))
> exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
> #endif
> Index: b/arch/arm/mach-exynos/pm.c
> ===================================================================
> --- a/arch/arm/mach-exynos/pm.c 2015-02-04 18:30:23.563819719 +0100
> +++ b/arch/arm/mach-exynos/pm.c 2015-02-04 18:47:32.951804008 +0100
> @@ -181,6 +181,7 @@ void exynos_enter_aftr(void)
> cpu_pm_exit();
> }
>
> +#if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
> static atomic_t cpu1_wakeup = ATOMIC_INIT(0);
>
> static int exynos_cpu0_enter_aftr(void)
> @@ -302,3 +303,4 @@ struct cpuidle_exynos_data cpuidle_coupl
> .pre_enter_aftr = exynos_pre_enter_aftr,
> .post_enter_aftr = exynos_post_enter_aftr,
> };
> +#endif /* CONFIG_SMP && CONFIG_ARM_EXYNOS_CPUIDLE */
> Index: b/drivers/cpuidle/cpuidle-exynos.c
> ===================================================================
> --- a/drivers/cpuidle/cpuidle-exynos.c 2015-02-04 18:30:32.935819577 +0100
> +++ b/drivers/cpuidle/cpuidle-exynos.c 2015-02-04 18:46:01.619805400 +0100
> @@ -117,7 +117,8 @@ static int exynos_cpuidle_probe(struct p
> {
> int ret;
>
> - if (of_machine_is_compatible("samsung,exynos4210")) {
> + if (IS_ENABLED(CONFIG_SMP) &&
> + of_machine_is_compatible("samsung,exynos4210")) {
> exynos_cpuidle_pdata = pdev->dev.platform_data;
>
> ret = cpuidle_register(&exynos_coupled_idle_driver,
--
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