linux-kernel - Re: [PATCH] perf parse-events: Reduce casts around bp

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Date:   Mon, 28 Sep 2020 09:22:29 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf parse-events: Reduce casts around bp_addr

Em Fri, Sep 25, 2020 at 03:01:03PM +0200, Jiri Olsa escreveu:
> On Thu, Sep 24, 2020 at 05:39:03PM -0700, Ian Rogers wrote:
> > perf_event_attr bp_addr is a u64. parse-events.y parses it as a u64, but
> > casts it to a void* and then parse-events.c casts it back to a u64.
> > Rather than all the casts, change the type of the address to be a u64.
> > This removes an issue noted in:
> > https://lore.kernel.org/lkml/20200903184359.GC3495158@kernel.org/
> > 
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>


Thanks, applied.

- Arnaldo

 
> thanks,
> jirka
> 
> > ---
> >  tools/perf/util/parse-events.c | 4 ++--
> >  tools/perf/util/parse-events.h | 2 +-
> >  tools/perf/util/parse-events.y | 8 ++++----
> >  3 files changed, 7 insertions(+), 7 deletions(-)
> > 
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index 667cbca1547a..f82ef1e840b2 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -940,12 +940,12 @@ do {					\
> >  }
> >  
> >  int parse_events_add_breakpoint(struct list_head *list, int *idx,
> > -				void *ptr, char *type, u64 len)
> > +				u64 addr, char *type, u64 len)
> >  {
> >  	struct perf_event_attr attr;
> >  
> >  	memset(&attr, 0, sizeof(attr));
> > -	attr.bp_addr = (unsigned long) ptr;
> > +	attr.bp_addr = addr;
> >  
> >  	if (parse_breakpoint_type(type, &attr))
> >  		return -EINVAL;
> > diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
> > index 00cde7d2e30c..e80c9b74f2f2 100644
> > --- a/tools/perf/util/parse-events.h
> > +++ b/tools/perf/util/parse-events.h
> > @@ -190,7 +190,7 @@ int parse_events_add_cache(struct list_head *list, int *idx,
> >  			   struct parse_events_error *error,
> >  			   struct list_head *head_config);
> >  int parse_events_add_breakpoint(struct list_head *list, int *idx,
> > -				void *ptr, char *type, u64 len);
> > +				u64 addr, char *type, u64 len);
> >  int parse_events_add_pmu(struct parse_events_state *parse_state,
> >  			 struct list_head *list, char *name,
> >  			 struct list_head *head_config,
> > diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> > index 645bf4f1859f..d5b6aff82f21 100644
> > --- a/tools/perf/util/parse-events.y
> > +++ b/tools/perf/util/parse-events.y
> > @@ -511,7 +511,7 @@ PE_PREFIX_MEM PE_VALUE '/' PE_VALUE ':' PE_MODIFIER_BP sep_dc
> >  	list = alloc_list();
> >  	ABORT_ON(!list);
> >  	err = parse_events_add_breakpoint(list, &parse_state->idx,
> > -					(void *)(uintptr_t) $2, $6, $4);
> > +					  $2, $6, $4);
> >  	free($6);
> >  	if (err) {
> >  		free(list);
> > @@ -528,7 +528,7 @@ PE_PREFIX_MEM PE_VALUE '/' PE_VALUE sep_dc
> >  	list = alloc_list();
> >  	ABORT_ON(!list);
> >  	if (parse_events_add_breakpoint(list, &parse_state->idx,
> > -						(void *)(uintptr_t) $2, NULL, $4)) {
> > +					$2, NULL, $4)) {
> >  		free(list);
> >  		YYABORT;
> >  	}
> > @@ -544,7 +544,7 @@ PE_PREFIX_MEM PE_VALUE ':' PE_MODIFIER_BP sep_dc
> >  	list = alloc_list();
> >  	ABORT_ON(!list);
> >  	err = parse_events_add_breakpoint(list, &parse_state->idx,
> > -					(void *)(uintptr_t) $2, $4, 0);
> > +					  $2, $4, 0);
> >  	free($4);
> >  	if (err) {
> >  		free(list);
> > @@ -561,7 +561,7 @@ PE_PREFIX_MEM PE_VALUE sep_dc
> >  	list = alloc_list();
> >  	ABORT_ON(!list);
> >  	if (parse_events_add_breakpoint(list, &parse_state->idx,
> > -						(void *)(uintptr_t) $2, NULL, 0)) {
> > +					$2, NULL, 0)) {
> >  		free(list);
> >  		YYABORT;
> >  	}
> > -- 
> > 2.28.0.681.g6f77f65b4e-goog
> > 
> 

-- 

- Arnaldo