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Date: Sun, 17 May 2015 21:21:17 +0300 (MSK)
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
Subject: Access through cast to volatile
On Sun, 17 May 2015, Jens Gustedt wrote:
> > > I only recently learned that even cast to volatile doesn't help in
> > > cases where the original object to which p points is not declared
> > > volatile. The C standard states that only volatile *declared* objects
> > > are subject to the rules of volatile. Accessing through a volatile
> > > pointer doesn't help.
> >
> > I'm not so sure about that.
>
> I am quite sure. We recently had a discussion on that in the
> committee, and the outcome was basically what I was stating above.
Was the Linux kernel's use of volatile cast in its ACCESS_ONCE macro
discussed?
(I realize it's offtopic, but I hope it's acceptable)
> > See this question on SO, which has two
> > conflicting and both reasonable-sounding answers:
> >
> > http://stackoverflow.com/questions/28654418/requirements-for-behavior-of-pointer-to-volatile-pointing-to-non-volatile-object
>
> thanks for the pointer, I didn't knew about the text in the rationale.
>
> This could be an indication that the text as it is in the standard is
> a defect.
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