linux-kernel - Re: [PATCH RESEND 1/1] perf build: Allow nested externs to enable BUILD

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Date:   Mon, 12 Oct 2020 16:13:38 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Vasily Gorbik <gor@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: [PATCH RESEND 1/1] perf build: Allow nested externs to enable
 BUILD_BUG() usage

Hi all,

On Mon, 12 Oct 2020 08:59:36 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> On Fri, 9 Oct 2020 14:41:11 +0200 Jiri Olsa <jolsa@...hat.com> wrote:
> >
> > On Fri, Oct 09, 2020 at 02:25:23PM +0200, Vasily Gorbik wrote:  
> > > Currently BUILD_BUG() macro is expanded to smth like the following:
> > >    do {
> > >            extern void __compiletime_assert_0(void)
> > >                    __attribute__((error("BUILD_BUG failed")));
> > >            if (!(!(1)))
> > >                    __compiletime_assert_0();
> > >    } while (0);
> > > 
> > > If used in a function body this obviously would produce build errors
> > > with -Wnested-externs and -Werror.
> > > 
> > > To enable BUILD_BUG() usage in tools/arch/x86/lib/insn.c which perf
> > > includes in intel-pt-decoder, build perf without -Wnested-externs.
> > > 
> > > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > > Signed-off-by: Vasily Gorbik <gor@...ux.ibm.com>    
> > 
> > that one applied nicely ;-) thanks
> > 
> > Acked-by: Jiri Olsa <jolsa@...hat.com>  
> 
> I will apply that patch to the merge of the tip tree today (instead of
> reverting the series I reverted in Friday) (unless I get an update of
> the tip tree containing it, of course).

Tested-by: Stephen Rothwell <sfr@...b.auug.org.au> # build tested

-- 
Cheers,
Stephen Rothwell

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