linux-kernel - Re: [PATCH V2 2/3] tools/perf: Use is_perf_pid_map_name helper function to check dso's of pattern /tmp/perf-%d.map

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Date: Mon, 17 Jun 2024 14:59:22 +0100
From: James Clark <james.clark@....com>
To: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, akanksha@...ux.ibm.com, maddy@...ux.ibm.com,
 kjain@...ux.ibm.com, disgoel@...ux.vnet.ibm.com, acme@...nel.org,
 jolsa@...nel.org, adrian.hunter@...el.com, irogers@...gle.com,
 namhyung@...nel.org
Subject: Re: [PATCH V2 2/3] tools/perf: Use is_perf_pid_map_name helper
 function to check dso's of pattern /tmp/perf-%d.map



On 17/06/2024 14:03, Athira Rajeev wrote:
> commit 80d496be89ed ("perf report: Add support for profiling JIT
> generated code") added support for profiling JIT generated code.
> This patch handles dso's of form "/tmp/perf-$PID.map".
> 
> Some of the references doesn't check exactly for same pattern.
> some uses "if (!strncmp(dso_name, "/tmp/perf-", 10))". Fix
> this by using helper function is_perf_pid_map_name which looks
> for proper pattern of form: "/tmp/perf-$PID.map" for these checks.
> 
> Signed-off-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
> ---
>  tools/perf/util/dsos.c    | 2 +-
>  tools/perf/util/srcline.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/dsos.c b/tools/perf/util/dsos.c
> index ab3d0c01dd63..23cd02aa701d 100644
> --- a/tools/perf/util/dsos.c
> +++ b/tools/perf/util/dsos.c
> @@ -275,7 +275,7 @@ static void dso__set_basename(struct dso *dso)
>  	char *base, *lname;
>  	int tid;
>  
> -	if (sscanf(dso__long_name(dso), "/tmp/perf-%d.map", &tid) == 1) {
> +	if (is_perf_pid_map_name(dso__long_name(dso))) {
>  		if (asprintf(&base, "[JIT] tid %d", tid) < 0)
>  			return;
>  	} else {
> diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
> index 9d670d8c1c08..51eb78993fe2 100644
> --- a/tools/perf/util/srcline.c
> +++ b/tools/perf/util/srcline.c
> @@ -39,7 +39,7 @@ static const char *srcline_dso_name(struct dso *dso)
>  	if (dso_name[0] == '[')
>  		return NULL;
>  
> -	if (!strncmp(dso_name, "/tmp/perf-", 10))
> +	if (is_perf_pid_map_name(dso_name))
>  		return NULL;
>  
>  	return dso_name;

Duplicate of [1] but the latest version of the other one looks like it
might have a mistake in it.

For this one I get this compilation error:

util/dsos.c: In function ‘dso__set_basename’:
util/dsos.c:279:21: error: ‘tid’ may be used uninitialized
[-Werror=maybe-uninitialized]
  279 |                 if (asprintf(&base, "[JIT] tid %d", tid) < 0)



[1]:
https://lore.kernel.org/linux-perf-users/20240601125946.1741414-10-ChaitanyaS.Prakash@arm.com/