linux-kernel - Re: [PATCH 2/4] radix tree test suite: Add __must_be

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Date:   Wed, 12 May 2021 22:13:00 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Matthew Wilcox <willy@...radead.org>
CC:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] radix tree test suite: Add __must_be_array() support

* Matthew Wilcox <willy@...radead.org> [210512 17:48]:
> On Wed, May 12, 2021 at 06:48:52PM +0000, Liam Howlett wrote:
> > Copy __must_be_array() define from include/linux/compiler.h for use in
> > the radix tree test suite userspace compiles.
> 
> We needed this earlier, but see commit
> 7487de534dcbe143e6f41da751dd3ffcf93b00ee
> 
> I bet if you revert this commit, it'll still build fine.
> 
> Also, I bet patch 1/4 is the same -- I see a definition of
> fallthrough in tools/include/linux/compiler-gcc.h

You are correct.  Please disregard patch 1 and 2.

Thanks,
Liam

> 
> > Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> > ---
> >  tools/testing/radix-tree/linux/kernel.h | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/tools/testing/radix-tree/linux/kernel.h b/tools/testing/radix-tree/linux/kernel.h
> > index c400a27e544a..2c3771fff2c0 100644
> > --- a/tools/testing/radix-tree/linux/kernel.h
> > +++ b/tools/testing/radix-tree/linux/kernel.h
> > @@ -30,4 +30,6 @@
> >  # define fallthrough                    do {} while (0)  /* fallthrough */
> >  #endif /* __has_attribute */
> >  
> > +#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
> > +
> >  #endif /* _KERNEL_H */
> > -- 
> > 2.30.2