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Re: [Xen-devel] [PATCH RESEND 1/8] gnttab: drop useless locking

To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date: Tue, 15 Aug 2017 17:08:37 +0100
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>
Delivery-date: Tue, 15 Aug 2017 16:13:30 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On 15/08/17 15:38, Jan Beulich wrote:
> Holding any lock while accessing the maptrack entry fields is
> pointless, as these entries are protected by their associated active
> entry lock (which is being acquired later, before re-validating the
> fields read without holding the lock).
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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References:
- [Xen-devel] [PATCH 0/8] gnttab: recent XSA follow-up
  - From: Jan Beulich
- [Xen-devel] [PATCH RESEND 1/8] gnttab: drop useless locking
  - From: Jan Beulich

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