perf test probe_vfs_getname: Skip if no suitable line detected

JIRA: https://issues.redhat.com/browse/RHEL-74228

upstream
========
commit 92b664d
Author: Jakub Brnak <jbrnak@redhat.com>
Date: Mon Mar 24 15:45:23 2025 +0100

description
===========
In some cases when calling function add_probe_vfs_getname, line number
can't be detected by 'perf probe -L getname_flags':

  78         atomic_set(&result->refcnt, 1);

	     // one of the following lines should have line number
	     // but sometimes it does not because of optimization
	     result->uptr = filename;
             result->aname = NULL;

  81         audit_getname(result);

To prevent false failures, skip the affected tests if no suitable line
numbers can be detected.

    Signed-off-by: Jakub Brnak <jbrnak@redhat.com>
    Acked-by: Namhyung Kim <namhyung@kernel.org>
    Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Ian Rogers <irogers@google.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Kan Liang <kan.liang@linux.intel.com>
    Cc: Mark Rutland <mark.rutland@arm.com>
    Cc: Masami Hiramatsu <mhiramat@kernel.org>
    Cc: Michael Petlan <mpetlan@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Tomas Glozar <tglozar@redhat.com>
    Link: https://lore.kernel.org/r/20250324144523.597557-1-jbrnak@redhat.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Signed-off-by: Jakub Brnak <jbrnak@redhat.com>

Author: Jakub Brnak

tools/perf/tests/shell/lib/probe_vfs_getname.sh

@@ -19,8 +19,14 @@ add_probe_vfs_getname() {
 			result_aname_re="[[:space:]]+([[:digit:]]+)[[:space:]]+result->aname = NULL;"
 			line=$(perf probe -L getname_flags 2>&1 | grep -E "$result_aname_re" | sed -r "s/$result_aname_re/\1/")
 		fi
+
+		if [ -z "$line" ] ; then
+			echo "Could not find probeable line"
+			return 2
+		fi
+
 		perf probe -q       "vfs_getname=getname_flags:${line} pathname=result->name:string" || \
-		perf probe $add_probe_verbose "vfs_getname=getname_flags:${line} pathname=filename:ustring"
+		perf probe $add_probe_verbose "vfs_getname=getname_flags:${line} pathname=filename:ustring" || return 1
 	fi
 }
 

tools/perf/tests/shell/probe_vfs_getname.sh

@@ -12,7 +12,13 @@ skip_if_no_perf_probe || exit 2
 # shellcheck source=lib/probe_vfs_getname.sh
 . "$(dirname $0)"/lib/probe_vfs_getname.sh
 
-add_probe_vfs_getname || skip_if_no_debuginfo
+add_probe_vfs_getname
 err=$?
+
+if [ $err -eq 1 ] ; then
+	skip_if_no_debuginfo
+	err=$?
+fi
+
 cleanup_probe_vfs_getname
 exit $err

tools/perf/tests/shell/record+script_probe_vfs_getname.sh

@@ -34,8 +34,14 @@ perf_script_filenames() {
 	grep -E " +touch +[0-9]+ +\[[0-9]+\] +[0-9]+\.[0-9]+: +probe:vfs_getname[_0-9]*: +\([[:xdigit:]]+\) +pathname=\"${file}\""
 }
 
-add_probe_vfs_getname || skip_if_no_debuginfo
+add_probe_vfs_getname
 err=$?
+
+if [ $err -eq 1 ] ; then
+        skip_if_no_debuginfo
+        err=$?
+fi
+
 if [ $err -ne 0 ] ; then
 	exit $err
 fi

tools/perf/tests/shell/trace+probe_vfs_getname.sh

@@ -24,9 +24,14 @@ trace_open_vfs_getname() {
 	grep -E " +[0-9]+\.[0-9]+ +\( +[0-9]+\.[0-9]+ ms\): +touch/[0-9]+ open(at)?\((dfd: +CWD, +)?filename: +\"?${file}\"?, +flags: CREAT\|NOCTTY\|NONBLOCK\|WRONLY, +mode: +IRUGO\|IWUGO\) += +[0-9]+$"
 }
 
-
-add_probe_vfs_getname || skip_if_no_debuginfo
+add_probe_vfs_getname
 err=$?
+
+if [ $err -eq 1 ] ; then
+        skip_if_no_debuginfo
+        err=$?
+fi
+
 if [ $err -ne 0 ] ; then
 	exit $err
 fi