Re: [PATCH v5 00/18] Rework READ_ONCE() to improve codegen

[Peter Zijlstra]

On Wed, May 13, 2020 at 03:58:30PM +0200, Marco Elver wrote:
> On Wed, 13 May 2020 at 15:24, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> > Also, could not this compiler instrumentation live as a kernel specific
> > GCC-plugin instead of being part of GCC proper? Because in that case,
> > we'd have much better control over it.
> 
> I'd like it if we could make it a GCC-plugin for GCC, but how? I don't
> see a way to affect TSAN instrumentation. FWIW Clang already has
> distinguish-volatile support (unreleased Clang 11).

Ah, I figured not use the built-in TSAN at all, do a complete
replacement of the instrumentation with a plugin. AFAIU plugins are able
to emit instrumentation, but this isn't something I know a lot about.