Messages in this thread |  | | From | Linus Torvalds <> | | Date | Wed, 28 Sep 2011 09:10:54 -0700 | | Subject | Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks |
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On Wed, Sep 28, 2011 at 8:55 AM, Jan Beulich <JBeulich@suse.com> wrote: > >> just use "lock xaddw" there too. > > I'm afraid that's not possible, as that might carry from the low 8 bits > into the upper 8 ones, which must be avoided.
Oh damn, you're right. So I guess the "right" way to do things is with cmpxchg, but some nasty mfence setup could do it too.
Linus
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