From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Linus Walleij <linus.walleij@linaro.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ARM: ux500: fix prcmu_is_cpu_in_wfi() calculation
Date: Wed, 16 Nov 2016 16:35:12 +0100 [thread overview]
Message-ID: <20161116153512.GA2155@mai> (raw)
In-Reply-To: <20161116152047.3336967-1-arnd@arndb.de>
On Wed, Nov 16, 2016 at 04:20:37PM +0100, Arnd Bergmann wrote:
> This function clearly never worked and always returns true,
> as pointed out by gcc-7:
>
> arch/arm/mach-ux500/pm.c: In function 'prcmu_is_cpu_in_wfi':
> arch/arm/mach-ux500/pm.c:137:212: error: ?: using integer constants in boolean context, the expression will always evaluate to 'true' [-Werror=int-in-bool-context]
>
> With the added braces, the condition actually makes sense.
>
> Fixes: 34fe6f107eab ("mfd : Check if the other db8500 core is in WFI")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> arch/arm/mach-ux500/pm.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-ux500/pm.c b/arch/arm/mach-ux500/pm.c
> index 8538910db202..a970e7fcba9e 100644
> --- a/arch/arm/mach-ux500/pm.c
> +++ b/arch/arm/mach-ux500/pm.c
> @@ -134,8 +134,8 @@ bool prcmu_pending_irq(void)
> */
> bool prcmu_is_cpu_in_wfi(int cpu)
> {
> - return readl(PRCM_ARM_WFI_STANDBY) & cpu ? PRCM_ARM_WFI_STANDBY_WFI1 :
> - PRCM_ARM_WFI_STANDBY_WFI0;
> + return readl(PRCM_ARM_WFI_STANDBY) &
> + (cpu ? PRCM_ARM_WFI_STANDBY_WFI1 : PRCM_ARM_WFI_STANDBY_WFI0);
> }
>
> /*
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Very strange this board did not hang with this broken function.
It is used in a critical function for cpuidle. Is it possible to make a quick
test with this cpuidle test program [1] ?
Thanks!
-- Daniel
[1] https://git.linaro.org/power/pm-qa.git/tree/cpuidle/cpuidle_killer.c
--
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next prev parent reply other threads:[~2016-11-16 15:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-16 15:20 [PATCH] ARM: ux500: fix prcmu_is_cpu_in_wfi() calculation Arnd Bergmann
2016-11-16 15:35 ` Daniel Lezcano [this message]
2016-11-22 8:47 ` Linus Walleij
2016-11-22 9:04 ` Arnd Bergmann
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