Re: [RFC] LKMM: Add volatile_if()

[Segher Boessenkool]

On Wed, Jun 09, 2021 at 10:31:13AM -0700, Nick Desaulniers wrote:
> On Wed, Jun 9, 2021 at 10:20 AM Segher Boessenkool
> <segher@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> > On Wed, Jun 09, 2021 at 06:13:00PM +0200, Marco Elver wrote:
> > > On Wed, 9 Jun 2021 at 17:33, Segher Boessenkool
> > > <segher@xxxxxxxxxxxxxxxxxxx> wrote:
> > > [...]
> > > > > An alternative design would be to use a statement attribute to only
> > > > > enforce (C) ("__attribute__((mustcontrol))" ?).
> > > >
> > > > Statement attributes only exist for empty statements.  It is unclear how
> > > > (and if!) we could support it for general statements.
> > >
> > > Statement attributes can apply to anything -- Clang has had them apply
> > > to non-empty statements for a while.
> >
> > First off, it is not GCC's problem if LLVM decides to use a GCC
> > extension in some non-compatible way.
> 
> Reminds me of
> https://lore.kernel.org/lkml/CAHk-=whu19Du_rZ-zBtGsXAB-Qo7NtoJjQjd-Sa9OB5u1Cq_Zw@xxxxxxxxxxxxxx/

And my reply to that
https://lore.kernel.org/lkml/20200910154423.GK28786@xxxxxxxxxxxxxxxxx/


Segher