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Re: [Xen-devel] [PATCHv4 4/8] arm: provide add_sized()

To: Ian Campbell <ian.campbell@xxxxxxxxxx>
From: Tim Deegan <tim@xxxxxxx>
Date: Tue, 5 May 2015 14:54:41 +0100
Cc: Keir Fraser <keir@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jennifer Herbert <jennifer.herbert@xxxxxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 05 May 2015 13:54:45 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

At 14:49 +0100 on 05 May (1430837355), Ian Campbell wrote:
> On Thu, 2015-04-30 at 16:33 +0100, David Vrabel wrote:
> > add_sized(ptr, inc) adds inc to the value at ptr using only the correct
> > size of loads and stores for the type of *ptr.  The add is /not/ atomic.
> 
> atomic.h is an odd place for it then ;-)

The reads and writes _are_ atomic, though.  It's just that the whole
r/m/w is not.

Tim.

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References:
- Re: [Xen-devel] [PATCHv4 4/8] arm: provide add_sized()
  - From: Ian Campbell

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