Re: [Xen-devel] [PATCHv2 4/6] x86: provide xadd()

[Tim Deegan <tim@xxxxxxx>]

At 12:49 +0100 on 16 Apr (1429188559), Jan Beulich wrote:
> >>> On 16.04.15 at 13:25, <tim@xxxxxxx> wrote:
> > But also: AFAICS the GCC builtin __sync_fetch_and_add() does almost
> > exactly this (the difference being that those are also compiler
> > barriers where this is only a CPU barrier).  Should we be using it
> > instead?
> 
> I'm afraid that's useful only from gcc 4.5.x onwards; earlier versions
> (on x86 at least) simply generate a function call relying on a library to
> implement it.

Darn. :(

Tim.

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