From: Eder Zulian Date: Tue, 22 Oct 2024 17:23:27 +0000 (+0200) Subject: resolve_btfids: Fix compiler warnings X-Git-Tag: v6.13-rc1~136^2~44^2~2 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2c3d022abe6c3165109393b75a127b06c2c70063;p=thirdparty%2Fkernel%2Fstable.git resolve_btfids: Fix compiler warnings Initialize 'set' and 'set8' pointers to NULL in sets_patch to prevent possible compiler warnings which are issued for various optimization levels, but do not happen when compiling with current default compilation options. For example, when compiling resolve_btfids with $ make "HOSTCFLAGS=-O2 -Wall" -C tools/bpf/resolve_btfids/ clean all Clang version 17.0.6 and GCC 13.3.1 issue following -Wmaybe-uninitialized warnings for variables 'set8' and 'set': In function ‘sets_patch’, inlined from ‘symbols_patch’ at main.c:748:6, inlined from ‘main’ at main.c:823:6: main.c:163:9: warning: ‘set8’ may be used uninitialized [-Wmaybe-uninitialized] 163 | eprintf(1, verbose, pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:729:17: note: in expansion of macro ‘pr_debug’ 729 | pr_debug("sorting addr %5lu: cnt %6d [%s]\n", | ^~~~~~~~ main.c: In function ‘main’: main.c:682:37: note: ‘set8’ was declared here 682 | struct btf_id_set8 *set8; | ^~~~ In function ‘sets_patch’, inlined from ‘symbols_patch’ at main.c:748:6, inlined from ‘main’ at main.c:823:6: main.c:163:9: warning: ‘set’ may be used uninitialized [-Wmaybe-uninitialized] 163 | eprintf(1, verbose, pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:729:17: note: in expansion of macro ‘pr_debug’ 729 | pr_debug("sorting addr %5lu: cnt %6d [%s]\n", | ^~~~~~~~ main.c: In function ‘main’: main.c:683:36: note: ‘set’ was declared here 683 | struct btf_id_set *set; | ^~~ Signed-off-by: Eder Zulian Signed-off-by: Andrii Nakryiko Acked-by: Jiri Olsa Link: https://lore.kernel.org/bpf/20241022172329.3871958-2-ezulian@redhat.com --- diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c index d54aaa0619df9..bd9f960bce3d5 100644 --- a/tools/bpf/resolve_btfids/main.c +++ b/tools/bpf/resolve_btfids/main.c @@ -679,8 +679,8 @@ static int sets_patch(struct object *obj) next = rb_first(&obj->sets); while (next) { - struct btf_id_set8 *set8; - struct btf_id_set *set; + struct btf_id_set8 *set8 = NULL; + struct btf_id_set *set = NULL; unsigned long addr, off; struct btf_id *id;