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Message-id: <1420637261.32552.4.camel@AMDC1943>
Date: Wed, 07 Jan 2015 14:27:41 +0100
From: Krzysztof Kozlowski <k.kozlowski@...sung.com>
To: Anand Moon <moon.linux@...oo.com>
Cc: Russell King <linux@....linux.org.uk>,
Kukjin Kim <kgene@...nel.org>,
Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
Doug Anderson <dianders@...omium.org>,
Kevin Hilman <khilman@...aro.org>,
Sachin Kamat <sachin.kamat@...sung.com>,
Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Tushar Behera <tushar.behera@...aro.org>,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ARM: exynos_defconfig: Enable CONFIG_LOCKUP_DETECTOR
On śro, 2015-01-07 at 18:29 +0530, Anand Moon wrote:
> Enable CONFIG_LOCKUP_DETECTOR to validate kernel locks state for exynos SOC.
>
> Enabling CONFIG_LOCKUP_DETECTOR help validator tracks the 'state' of lock-classes,
> and it tracks dependencies between different lock-classes.
> The validator maintains a rolling proof that the state and
> the dependencies are correct.
Unfortunately this is not correct. Lockup detector does something else.
Please read the help/manual for LOCKUP_DETECTOR. You can find in
lib/Kconfig.debug (around line 667).
Best regards,
Krzysztof
>
> Changes since v2:
> * Made commit message more clear
> * Corrected grammer in code comment
>
> Tested on Exynos5422 ODROID XU3 board.
>
> Signed-off-by: Anand Moon <moon.linux@...oo.com>
> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
> arch/arm/configs/exynos_defconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
> index 5ef14de..ecd9987 100644
> --- a/arch/arm/configs/exynos_defconfig
> +++ b/arch/arm/configs/exynos_defconfig
> @@ -178,6 +178,7 @@ CONFIG_PRINTK_TIME=y
> CONFIG_DEBUG_FS=y
> CONFIG_MAGIC_SYSRQ=y
> CONFIG_DEBUG_KERNEL=y
> +CONFIG_LOCKUP_DETECTOR=y
> CONFIG_DETECT_HUNG_TASK=y
> CONFIG_DEBUG_RT_MUTEXES=y
> CONFIG_DEBUG_SPINLOCK=y
--
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