[PATCH v1 06/18] perf tools: Use const for variables receiving str{str,r?chr}() returns

[Shreenidhi Shedi]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

commit 45718bce7daf39c618188b70a52644bb5a2f968a upstream

Newer glibc versions return const char for str{str,chr}() where the
haystack/s is const so to avoid warnings like these on fedora 44 change
some variables to const:

  36     8.17 fedora:44                     : FAIL gcc version 15.2.1 20251111 (Red Hat 15.2.1-4) (GCC)
    libbpf.c: In function 'kallsyms_cb':
    libbpf.c:8489:13: error: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
     8489 |         res = strstr(sym_name, ".llvm.");

Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20251211221756.96294-4-acme@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Shreenidhi Shedi <yesshedi@xxxxxxxxx>
---
 tools/perf/jvmti/libjvmti.c | 2 +-
 tools/perf/util/evlist.c    | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/jvmti/libjvmti.c b/tools/perf/jvmti/libjvmti.c
index fcca275e5bf9..d6b04d0fd35a 100644
--- a/tools/perf/jvmti/libjvmti.c
+++ b/tools/perf/jvmti/libjvmti.c
@@ -142,7 +142,7 @@ copy_class_filename(const char * class_sign, const char * file_name, char * resu
 	*/
 	if (*class_sign == 'L') {
 		int j, i = 0;
-		char *p = strrchr(class_sign, '/');
+		const char *p = strrchr(class_sign, '/');
 		if (p) {
 			/* drop the 'L' prefix and copy up to the final '/' */
 			for (i = 0; i < (p - class_sign); i++)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 41bbe6f85b0d..391a694ae2af 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1885,7 +1885,8 @@ static int evlist__parse_control_fifo(const char *str, int *ctl_fd, int *ctl_fd_
 
 int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close)
 {
-	char *comma = NULL, *endptr = NULL;
+	const char *comma = NULL;
+	char *endptr = NULL;
 
 	*ctl_fd_close = false;
 
-- 
2.54.0