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

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Date:   Fri, 25 Sep 2020 15:01:03 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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

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,
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
>