Re: Question about atomics

[Richard Henderson]

On 3/13/22 11:29, Warner Losh wrote:
> So I was assuming that the cas instructions for arm use start/end_exclsive 
> under the covers.
> Is that the case?

Nope.  The store exclusive guest insn is implemented with a host cmpxchg.

Oh, I'd forgotten about the old arm cmpxchg64 syscall, which is still implemented with 
start/end_exclusive.  That should get fixed...


r~