RE: [PATCH v3 1/2] x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()

[David Laight]

> From: Dan Williams
> > Sent: 20 May 2020 16:26
> ...
> > > > +#ifdef CONFIG_ARCH_HAS_COPY_MC
> > > > +extern unsigned long __must_check
> > >
> > > We try not to add extern in headers anymore.
> >
> > Ok, I was doing the copy-pasta dance, but I'll remove this.
> 
> It is data not code, it needs the extern to not be 'common'.
> OTOH what is a global variable being used for?

Aaarg not enough context...

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