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Date: Wed, 10 Sep 2014 13:36:14 +0100
From: David Vrabel <david.vrabel@citrix.com>
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To: Yijing Wang <wangyijing@huawei.com>,
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Subject: Re: [Xen-devel] [PATCH v1 04/21] x86/xen/MSI: Eliminate arch_msix_mask_irq()
 and arch_msi_mask_irq()
References: <1409911806-10519-1-git-send-email-wangyijing@huawei.com> <1409911806-10519-5-git-send-email-wangyijing@huawei.com>
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On 05/09/14 11:09, Yijing Wang wrote:
> Commit 0e4ccb150 added two __weak arch functions arch_msix_mask_irq()
> and arch_msi_mask_irq() to fix a bug found when running xen in x86.
> Introduced these two funcntions make MSI code complex. And mask/unmask
> is the irq actions related to interrupt controller, should not use
> weak arch functions to override mask/unmask interfaces. This patch
> reverted commit 0e4ccb150 and export struct irq_chip msi_chip, modify
> msi_chip->irq_mask/irq_unmask() in xen init functions to fix this
> bug for simplicity. Also this is preparation for using struct
> msi_chip instead of weak arch MSI functions in all platforms.

Acked-by: David Vrabel <david.vrabel@citrix.com>

But I wonder if it would be better the Xen subsystem to provide its own
struct irq_chip instead of adjusting the fields in the generic x86 one.

David