linux-kernel - Re: [PATCH] perf dwarf-aux: Fix build with HAVE_DWARF_CFI

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Date: Thu, 9 May 2024 18:21:55 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: James Clark <james.clark@....com>, linux-perf-users@...r.kernel.org,
	leo.yan@...ux.dev, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf dwarf-aux: Fix build with HAVE_DWARF_CFI_SUPPORT

On Thu, May 09, 2024 at 10:11:36AM +0900, Masami Hiramatsu wrote:
> On Wed,  8 May 2024 15:14:57 +0100
> James Clark <james.clark@....com> wrote:
> 
> > check_allowed_ops() is used from both HAVE_DWARF_GETLOCATIONS_SUPPORT
> > and HAVE_DWARF_CFI_SUPPORT sections, so move it into the right place so
> > that it's available when either are defined. This shows up when doing
> > a static cross compile for arm64:
> > 
> >   $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LDFLAGS="-static" \
> >     EXTRA_PERFLIBS="-lexpat"
> > 
> >   util/dwarf-aux.c:1723:6: error: implicit declaration of function 'check_allowed_ops'
> > 
> 
> Looks good to me.
> 
> Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Thanks!

Thanks, applied to perf-tools-next,

- Arnaldo
 
> > Fixes: 55442cc2f22d ("perf dwarf-aux: Check allowed DWARF Ops")
> > Signed-off-by: James Clark <james.clark@....com>
> > ---
> >  tools/perf/util/dwarf-aux.c | 56 ++++++++++++++++++-------------------
> >  1 file changed, 28 insertions(+), 28 deletions(-)
> > 
> > diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
> > index c0a492e65388..c9584563cd56 100644
> > --- a/tools/perf/util/dwarf-aux.c
> > +++ b/tools/perf/util/dwarf-aux.c
> > @@ -1215,6 +1215,34 @@ static int offset_from_dwarf_op(Dwarf_Op *op)
> >  	}
> >  	return -1;
> >  }
> > +
> > +static bool check_allowed_ops(Dwarf_Op *ops, size_t nops)
> > +{
> > +	/* The first op is checked separately */
> > +	ops++;
> > +	nops--;
> > +
> > +	/*
> > +	 * It needs to make sure if the location expression matches to the given
> > +	 * register and offset exactly.  Thus it rejects any complex expressions
> > +	 * and only allows a few of selected operators that doesn't change the
> > +	 * location.
> > +	 */
> > +	while (nops) {
> > +		switch (ops->atom) {
> > +		case DW_OP_stack_value:
> > +		case DW_OP_deref_size:
> > +		case DW_OP_deref:
> > +		case DW_OP_piece:
> > +			break;
> > +		default:
> > +			return false;
> > +		}
> > +		ops++;
> > +		nops--;
> > +	}
> > +	return true;
> > +}
> >  #endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT || HAVE_DWARF_CFI_SUPPORT */
> >  
> >  #ifdef HAVE_DWARF_GETLOCATIONS_SUPPORT
> > @@ -1395,34 +1423,6 @@ static bool match_var_offset(Dwarf_Die *die_mem, struct find_var_data *data,
> >  	return true;
> >  }
> >  
> > -static bool check_allowed_ops(Dwarf_Op *ops, size_t nops)
> > -{
> > -	/* The first op is checked separately */
> > -	ops++;
> > -	nops--;
> > -
> > -	/*
> > -	 * It needs to make sure if the location expression matches to the given
> > -	 * register and offset exactly.  Thus it rejects any complex expressions
> > -	 * and only allows a few of selected operators that doesn't change the
> > -	 * location.
> > -	 */
> > -	while (nops) {
> > -		switch (ops->atom) {
> > -		case DW_OP_stack_value:
> > -		case DW_OP_deref_size:
> > -		case DW_OP_deref:
> > -		case DW_OP_piece:
> > -			break;
> > -		default:
> > -			return false;
> > -		}
> > -		ops++;
> > -		nops--;
> > -	}
> > -	return true;
> > -}
> > -
> >  /* Only checks direct child DIEs in the given scope. */
> >  static int __die_find_var_reg_cb(Dwarf_Die *die_mem, void *arg)
> >  {
> > -- 
> > 2.34.1
> > 
> > 
> 
> 
> -- 
> Masami Hiramatsu (Google) <mhiramat@...nel.org>