linux-kernel - [PATCH v4 38/63] objtool: Simplify special symbol handling in elf_update

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Message-ID: <dc0b1388e7a0a25a86c2a2238e216e63066829b2.1758067943.git.jpoimboe@kernel.org>
Date: Wed, 17 Sep 2025 09:03:46 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>,
	Miroslav Benes <mbenes@...e.cz>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	live-patching@...r.kernel.org,
	Song Liu <song@...nel.org>,
	laokz <laokz@...mail.com>,
	Jiri Kosina <jikos@...nel.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Weinan Liu <wnliu@...gle.com>,
	Fazla Mehrab <a.mehrab@...edance.com>,
	Chen Zhongjin <chenzhongjin@...wei.com>,
	Puranjay Mohan <puranjay@...nel.org>,
	Dylan Hatch <dylanbhatch@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v4 38/63] objtool: Simplify special symbol handling in elf_update_symbol()

!sym->sec isn't actually a thing: even STT_UNDEF and other special
symbol types belong to NULL section 0.

Simplify the initialization of 'shndx' accordingly.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 tools/objtool/elf.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 775d017b1b79b..c35726a47c07c 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -637,7 +637,7 @@ static int elf_update_sym_relocs(struct elf *elf, struct symbol *sym)
 static int elf_update_symbol(struct elf *elf, struct section *symtab,
 			     struct section *symtab_shndx, struct symbol *sym)
 {
-	Elf32_Word shndx = sym->sec ? sym->sec->idx : SHN_UNDEF;
+	Elf32_Word shndx;
 	Elf_Data *symtab_data = NULL, *shndx_data = NULL;
 	Elf64_Xword entsize = symtab->sh.sh_entsize;
 	int max_idx, idx = sym->idx;
@@ -645,8 +645,7 @@ static int elf_update_symbol(struct elf *elf, struct section *symtab,
 	bool is_special_shndx = sym->sym.st_shndx >= SHN_LORESERVE &&
 				sym->sym.st_shndx != SHN_XINDEX;
 
-	if (is_special_shndx)
-		shndx = sym->sym.st_shndx;
+	shndx = is_special_shndx ? sym->sym.st_shndx : sym->sec->idx;
 
 	s = elf_getscn(elf->elf, symtab->idx);
 	if (!s) {
-- 
2.50.0