linux-kernel - RE: [PATCH v2 2/2] x86: don't unmask disabled irqs when migrating them

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Message-ID: <alpine.DEB.2.00.1105091301040.10886@kaball-desktop>
Date:	Mon, 9 May 2011 13:02:47 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	"Tian, Kevin" <kevin.tian@...el.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	Ian Campbell <Ian.Campbell@...citrix.com>,
	"JBeulich@...ell.com" <JBeulich@...ell.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: RE: [PATCH v2 2/2] x86: don't unmask disabled irqs when migrating
 them

On Mon, 9 May 2011, Tian, Kevin wrote:
> yes, with your patch this issue disappears, since you explicitly make mask/unmask as
> a nop for xen_percpu_chip, which effectively avoids them from undesired unmask
> when doing the migration. Though it works, it's not intuitive as to me it's an
> workaround to make Xen chip implementation adapting to specific fixup_irqs logic.

I have been tring to follow the example of existing supported drivers.
The only x86 driver I could find that uses handle_percpu_irq is uv_irq
that does exatly the same thing.
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