Re: [Qemu-devel] [PATCH v6 13/19] cputlb: atomically update tlb fields used by tlb_reset_dirty

[Richard Henderson]

On 11/10/2016 05:14 PM, Alex Bennée wrote:
> Even worse than that we trip up the atomic.h QEMU_BUILD_BUG_ON with the
> atomic_cmpxchg. Now I believe we can use atomic_cmpxchg__nocheck without
> too much issue on x86 but we'll need to #ifdef it on detection of wide
> atomics.

You've already got CONFIG_ATOMIC64.  And what's the fallback?

We ought not be enabling mttcg for 32-bit host and 64-bit guest at all.  But 
that doesn't help much here, where we're otherwise guest width agnostic.


r~