linux-kernel - Re: [PATCH v4] irqchip: gic: Allow gic_arch

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Date:	Wed, 20 Aug 2014 12:11:14 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	linux-arm-msm@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4] irqchip: gic: Allow gic_arch_extn hooks to call into
 scheduler

On 08/17/14 17:17, Nicolas Pitre wrote:
> On Sun, 17 Aug 2014, Russell King - ARM Linux wrote:
>
>> I have no problem with changing gic_raise_softirq() to use a different
>> lock, which gic_migrate_target(), and gic_set_affinity() can also use.
>> There's no need for horrid locking here, because the only thing we're
>> protecting is gic_map[] and the write to the register to trigger an
>> IPI - and nothing using gic_arch_extn has any business knowing about
>> SGIs.
>>
>> No need for these crappy sgi_map_lock() macros and all the ifdeffery.
> Those macros are there only to conditionalize the locking in 
> gic_raise_softirq() because no locking what so ever is needed there when 
> gic_migrate_target() is configured out.  I suggested the macros to cut 
> down on the #ifdefery in the code.

Ok I can resend with the sgi lock around the gic_cpu_map updating code.
Let's see how v5 goes.

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