Messages in this thread | | | Date | Mon, 08 Sep 2014 12:12:50 -0700 | From | "H. Peter Anvin" <> | Subject | Re: bit fields && data tearing |
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On 09/08/2014 12:09 PM, James Bottomley wrote: > > Um, I think you need to re-read the thread; that's not what I said at > all. It's even written lower down: "PA can't do atomic bit sets (no > atomic RMW except the ldcw operation) it can do atomic writes to > fundamental sizes (byte, short, int, long) provided gcc emits the > correct primitive". The original question was whether atomicity > required native bus width access, which we currently assume, so there's > no extant problem. >
The issue at hand was whether or not partially overlapped (but natually aligned) writes can pass each other. *This* is the aggressive relaxation to which I am referring.
I would guess that that is a very unusual constraint.
-hpa
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