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[Qemu-devel] Re: [patch uq/master 2/2] kvm-all.c: define smp_wmb and use

From: Avi Kivity
Subject: [Qemu-devel] Re: [patch uq/master 2/2] kvm-all.c: define smp_wmb and use it for coalesced mmio
Date: Mon, 22 Feb 2010 17:28:25 +0200
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100120 Fedora/3.0.1-1.fc12 Thunderbird/3.0.1

On 02/22/2010 05:08 PM, Michael S. Tsirkin wrote:

I imagine all arches need an instruction.  For reads as well.

Note, gcc has a __sync_synchronize() builtin that compiles to mfence on
x86.  We might use that as a baseline for both rmb and wmb, and let each
arch override it incrementally.

This it what my patch did. Note it only works well for recent gcc.

Do you know how recent?
IIRC 4.3 has broken implementation.
4.4 seems OK as far as I can tell.

Well, so that idea's down.

error compiling committee.c: too many arguments to function

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