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

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

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 ;-) But given you use the
infrastructure I can't suggest a better home.

> This is needed for ticket locks to ensure the increment of the head ticket
> does not affect the tail ticket.
> 
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>



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