Re: [PATCH v3 06/19] asm/rwonce: Don't pull <asm/barrier.h> into 'asm-generic/rwonce.h'

[Will Deacon]

On Fri, Jul 10, 2020 at 10:06:12AM -0700, Nick Desaulniers wrote:
> On Fri, Jul 10, 2020 at 9:52 AM Will Deacon <will@xxxxxxxxxx> wrote:
> > diff --git a/include/linux/nospec.h b/include/linux/nospec.h
> > index 0c5ef54fd416..c1e79f72cd89 100644
> > --- a/include/linux/nospec.h
> > +++ b/include/linux/nospec.h
> > @@ -5,6 +5,8 @@
> >
> >  #ifndef _LINUX_NOSPEC_H
> >  #define _LINUX_NOSPEC_H
> > +
> > +#include <linux/compiler.h>
> 
> The other hunks LGTM, but this one is a little more curious to me. Can
> you walk me through this addition?

Sure. Without it, the build breaks on riscv because it includes this header
without first including <linux/compiler.h>, and this header relies on
OPTIMIZER_HIDE_VAR() being to defined as it is used in static inline
functions.

Perhaps I should squash this hunk into "compiler.h: Split {READ,WRITE}_ONCE
definitions out into rwonce.h" instead, as that is where I remove the
include of <linux/compiler.h> from 'asm-generic/barrier.h'. I'll check
the bisection on riscv...

Will