linux-kernel - Re: [PATCH v2] ARM: exynos_defconfig: Enable CONFIG_LOCKUP

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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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