linux-kernel - Re: [PATCH] perf tools: Fix compile error for x86

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Date:   Mon, 22 Aug 2022 10:14:19 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Yang Jihong <yangjihong1@...wei.com>, bp@...e.de,
        ndesaulniers@...gle.com, nathan@...nel.org,
        alexandre.belloni@...tlin.com, namhyung@...nel.org,
        jolsa@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tools: Fix compile error for x86

Em Mon, Aug 22, 2022 at 12:37:53PM +0200, Ingo Molnar escreveu:
> 
> * Yang Jihong <yangjihong1@...wei.com> wrote:
> 
> > Commit a0a12c3ed057 ("asm goto: eradicate CC_HAS_ASM_GOTO") eradicates
> > CC_HAS_ASM_GOTO, perf on x86 call asm_volatile_goto when compiling __GEN_RMWcc.
> > However, asm_volatile_goto is not declared, which causes compilation error:
> > 
> > In file included from /home/linux/tools/include/asm/../../arch/x86/include/asm/atomic.h:7,
> >                  from /home/linux/tools/include/asm/atomic.h:6,
> >                  from /home/linux/tools/include/linux/atomic.h:5,
> >                  from /home/linux/tools/include/linux/refcount.h:41,
> >                  from /home/linux/tools/lib/perf/include/internal/cpumap.h:5,
> >                  from /home/linux/tools/perf/util/cpumap.h:7,
> >                  from /home/linux/tools/perf/util/env.h:7,
> >                  from /home/linux/tools/perf/util/header.h:12,
> >                  from pmu-events/pmu-events.c:9:
> > /home/linux/tools/include/asm/../../arch/x86/include/asm/atomic.h: In function ‘atomic_dec_and_test’:
> > /home/linux/tools/include/asm/../../arch/x86/include/asm/rmwcc.h:7:2: error: implicit declaration of function ‘asm_volatile_goto’ [-Werror=implicit-function-declaration]
> >   asm_volatile_goto (fullop "; j" cc " %l[cc_label]"  \
> >   ^~~~~~~~~~~~~~~~~
> > 
> > Solution:
> > Define asm_volatile_goto in compiler_types.h if not declared.
> > 
> > Currently, only x86 architecture uses asm_volatile_goto.
> > Theoretically, this patch affects only the x86 architecture.
> > 
> > Fixes: a0a12c3ed057 ("asm goto: eradicate CC_HAS_ASM_GOTO")
> > Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
> > ---
> >  tools/include/linux/compiler_types.h | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/tools/include/linux/compiler_types.h b/tools/include/linux/compiler_types.h
> > index 24ae3054f304..1bdd834bdd57 100644
> > --- a/tools/include/linux/compiler_types.h
> > +++ b/tools/include/linux/compiler_types.h
> > @@ -36,4 +36,8 @@
> >  #include <linux/compiler-gcc.h>
> >  #endif
> >  
> > +#ifndef asm_volatile_goto
> > +#define asm_volatile_goto(x...) asm goto(x)
> > +#endif
> 
> Tested-by: Ingo Molnar <mingo@...nel.org>

Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Linus, I'll prep a pull req later today or you can apply this so that we
can reduce the window where tools/perf/ isn't building.

- Arnaldo