Re: [Xen-devel] [PATCH 08/45] xen: arm64: spinlocks

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2013-02-07 at 15:34 +0000, Tim Deegan wrote:
> At 14:42 +0000 on 07 Feb (1360248122), Tim Deegan wrote:
> > The 32-bit ones have a scattering of DSBs and SEVs that aren't there in
> > 64-bit.  The DSBs at least seem useful.  Not sure about SEV - presumably
> > that's useful if the slow path has a WFE in it?
> 
> OK, I see the arm64 versions are using the new load-acquire/store-release
> instructions so no DSBs or DMBs should be necessary.  Still puzzled by
> the SEV.

The ldar/strl generate the sev's as appropriate too.

Ian.



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