linux-kernel - Re: [PATCH v11 5/9] ARM: l2c: Get outer cache .write_sec callback from mach

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Date:	Mon, 5 Jan 2015 08:25:09 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Tomasz Figa <tomasz.figa@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-omap@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Kukjin Kim <kgene.kim@...sung.com>, lauraa@...eaurora.org,
	linus.walleij@...aro.org, drake@...lessm.com, loeliger@...il.com,
	Mark Rutland <mark.rutland@....com>, nm@...com,
	khilman@...aro.org
Subject: Re: [PATCH v11 5/9] ARM: l2c: Get outer cache .write_sec callback
 from mach_desc only if not NULL

* Marek Szyprowski <m.szyprowski@...sung.com> [150105 04:22]:
> From: Tomasz Figa <t.figa@...sung.com>
> 
> Certain platforms (i.e. Exynos) might need to set .write_sec callback
> from firmware initialization which is happenning in .init_early callback
> of machine descriptor. However current code will overwrite the pointer
> with whatever is present in machine descriptor, even though it can be
> already set earlier. This patch fixes this by making the assignment
> conditional, depending on whether current .write_sec callback is NULL.
> 
> Signed-off-by: Tomasz Figa <t.figa@...sung.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>

Acked-by: Tony Lindgren <tony@...mide.com>

> ---
>  arch/arm/kernel/irq.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
> index ad857bada96c..350f188c92d2 100644
> --- a/arch/arm/kernel/irq.c
> +++ b/arch/arm/kernel/irq.c
> @@ -109,7 +109,8 @@ void __init init_IRQ(void)
>  
>  	if (IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_CACHE_L2X0) &&
>  	    (machine_desc->l2c_aux_mask || machine_desc->l2c_aux_val)) {
> -		outer_cache.write_sec = machine_desc->l2c_write_sec;
> +		if (!outer_cache.write_sec)
> +			outer_cache.write_sec = machine_desc->l2c_write_sec;
>  		ret = l2x0_of_init(machine_desc->l2c_aux_val,
>  				   machine_desc->l2c_aux_mask);
>  		if (ret)
> -- 
> 1.9.2
> 
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