linux-kernel - Re: [PATCH v2] ARM: Add imprecise abort enable/disable macro

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Date:	Wed, 12 Feb 2014 16:14:27 +0100
From:	Fabrice Gasnier <fabrice.gasnier@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Fabrice GASNIER <fabrice.gasnier@...ricsson.com>
Cc:	<u.kleine-koenig@...gutronix.de>, <jonathan.austin@....com>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<nico@...aro.org>, <sboyd@...eaurora.org>, <marc.zyngier@....com>,
	<ben.dooks@...ethink.co.uk>, <vgupta@...opsys.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <maxime.coquelin@...com>
Subject: Re: [PATCH v2] ARM: Add imprecise abort enable/disable macro

Hi Russell,

On 02/12/2014 02:18 PM, Russell King - ARM Linux wrote:
> On Wed, Feb 12, 2014 at 02:05:39PM +0100, Fabrice GASNIER wrote:
>> Hi,
>>
>> Any comments on this patch ?
>>
>> Russell, can I add this patch to your patch tracker system ?
> I don't see how this works on anything but ARMv7M.

Sorry, i'm confused.

In the first patch you proposed,
http://archive.arm.linux.org.uk/lurker/message/20140131.170827.d752a1cc.en.html
there was :

#ifndef CONFIG_CPU_V7M

[...]

/* Enable imprecise aborts */
[...]

#else /* ifndef CONFIG_CPU_V7M */

I understand that abort handling (vectors and masking ?) is different on 
armv7-m ?
Or should we make no distinction ?

I have kept the same principle regarding abort enable/disable macro.

#if __LINUX_ARM_ARCH__ >= 6
[...]

#ifndef CONFIG_CPU_V7M
#define local_abt_enable()  __asm__("cpsie a    @ __sta" : : : "memory", 
"cc")
#define local_abt_disable() __asm__("cpsid a    @ __cla" : : : "memory", 
"cc")
#else
#define local_abt_enable()    do { } while (0)
#define local_abt_disable()    do { } while (0)
#endif

#else
[...]
#define local_abt_enable()    do { } while (0)
#define local_abt_disable()    do { } while (0)
#endif

Sorry if this is silly question ...

BR,
Fabrice
>

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