From 4672129127eed0d16ab1b4b70b4e49014e49e8bb Mon Sep 17 00:00:00 2001
From: Viktor Malik <vmalik@redhat.com>
Date: Wed, 1 Mar 2023 09:53:55 +0100
Subject: [PATCH] libbpf: Cleanup linker_append_elf_relos
Clang Static Analyser (scan-build) reports some unused symbols and dead
assignments in the linker_append_elf_relos function. Clean these up.
Signed-off-by: Viktor Malik <vmalik@redhat.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/c5c8fe9f411b69afada8399d23bb048ef2a70535.1677658777.git.vmalik@redhat.com
---
tools/lib/bpf/linker.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
index 4ac02c28e152a..d7069780984a3 100644
--- a/tools/lib/bpf/linker.c
+++ b/tools/lib/bpf/linker.c
@@ -1997,7 +1997,6 @@ add_sym:
static int linker_append_elf_relos(struct bpf_linker *linker, struct src_obj *obj)
{
struct src_sec *src_symtab = &obj->secs[obj->symtab_sec_idx];
- struct dst_sec *dst_symtab;
int i, err;
for (i = 1; i < obj->sec_cnt; i++) {
@@ -2030,9 +2029,6 @@ static int linker_append_elf_relos(struct bpf_linker *linker, struct src_obj *ob
return -1;
}
- /* add_dst_sec() above could have invalidated linker->secs */
- dst_symtab = &linker->secs[linker->symtab_sec_idx];
-
/* shdr->sh_link points to SYMTAB */
dst_sec->shdr->sh_link = linker->symtab_sec_idx;
@@ -2049,16 +2045,13 @@ static int linker_append_elf_relos(struct bpf_linker *linker, struct src_obj *ob
dst_rel = dst_sec->raw_data + src_sec->dst_off;
n = src_sec->shdr->sh_size / src_sec->shdr->sh_entsize;
for (j = 0; j < n; j++, src_rel++, dst_rel++) {
- size_t src_sym_idx = ELF64_R_SYM(src_rel->r_info);
- size_t sym_type = ELF64_R_TYPE(src_rel->r_info);
- Elf64_Sym *src_sym, *dst_sym;
- size_t dst_sym_idx;
+ size_t src_sym_idx, dst_sym_idx, sym_type;
+ Elf64_Sym *src_sym;
src_sym_idx = ELF64_R_SYM(src_rel->r_info);
src_sym = src_symtab->data->d_buf + sizeof(*src_sym) * src_sym_idx;
dst_sym_idx = obj->sym_map[src_sym_idx];
- dst_sym = dst_symtab->raw_data + sizeof(*dst_sym) * dst_sym_idx;
dst_rel->r_offset += src_linked_sec->dst_off;
sym_type = ELF64_R_TYPE(src_rel->r_info);
dst_rel->r_info = ELF64_R_INFO(dst_sym_idx, sym_type);
--
2.30.2