linux-kernel - Re: [PATCH] ARM: gic: fix irq affinity mismatch.

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Message-ID: <20120924083530.GM15609@n2100.arm.linux.org.uk>
Date:	Mon, 24 Sep 2012 09:35:30 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Chanho Min <chanho0207@...il.com>
Cc:	Marc Zyngier <marc.zyngier@....com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Will Deacon <will.deacon@....com>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: gic: fix irq affinity mismatch.

On Mon, Sep 24, 2012 at 12:06:19PM +0900, Chanho Min wrote:
> Even if we set affinity to multiple cpus via procfs, gic_set_affinity
> allows to set one target only. But, '/proc/irq/xxx/smp_affinity' shows
> as we are successful in the setting of multiple affinity. Thus irq_data->
> affinity mismatches with the GICD_ITARGETSRs.
> 
> fix it as bellows.
> - Set the default affinity to the boot cpu in gic_dist_init. thereafter,
> irq_data->affinity will be set to default 1-bit affinity.
> - Even if we write multiple bits to smp_affinity, both irq_data and gic
> register will be set one cpu. procfs will show 1 bit affinity as well.

This has come up before.  There is no requirement to make the affinity
mask reflect back to userspace what the hardware is doing.  So, NAK.
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