linux-kernel - [PATCH 4/6] objtool: Return canonical symbol when aliases exist in symbol finding helpers

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Message-ID: <450470a4897706af77453ad333e18af5ebab653c.1763671318.git.jpoimboe@kernel.org>
Date: Thu, 20 Nov 2025 12:52:18 -0800
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Rong Xu <xur@...gle.com>,
	Han Shen <shenhan@...gle.com>,
	Sriraman Tallam <tmsriram@...gle.com>,
	Krzysztof Pszeniczny <kpszeniczny@...gle.com>
Subject: [PATCH 4/6] objtool: Return canonical symbol when aliases exist in symbol finding helpers

When symbol alias ambiguity exists in the symbol finding helper
functions, return the canonical sym->alias, as that's the one which gets
used by validate_branch() and elsewhere.

This doesn't fix any known issues, just makes the symbol alias behavior
more robust.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 tools/objtool/elf.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 4f15643ad70c..7e2c0ae6b41a 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -172,11 +172,11 @@ static struct symbol *find_symbol_by_index(struct elf *elf, unsigned int idx)
 struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset)
 {
 	struct rb_root_cached *tree = (struct rb_root_cached *)&sec->symbol_tree;
-	struct symbol *iter;
+	struct symbol *sym;
 
-	__sym_for_each(iter, tree, offset, offset) {
-		if (iter->offset == offset && !is_sec_sym(iter))
-			return iter;
+	__sym_for_each(sym, tree, offset, offset) {
+		if (sym->offset == offset && !is_sec_sym(sym))
+			return sym->alias;
 	}
 
 	return NULL;
@@ -185,11 +185,11 @@ struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset)
 struct symbol *find_func_by_offset(struct section *sec, unsigned long offset)
 {
 	struct rb_root_cached *tree = (struct rb_root_cached *)&sec->symbol_tree;
-	struct symbol *iter;
+	struct symbol *func;
 
-	__sym_for_each(iter, tree, offset, offset) {
-		if (iter->offset == offset && is_func_sym(iter))
-			return iter;
+	__sym_for_each(func, tree, offset, offset) {
+		if (func->offset == offset && is_func_sym(func))
+			return func->alias;
 	}
 
 	return NULL;
@@ -220,7 +220,7 @@ struct symbol *find_symbol_containing(const struct section *sec, unsigned long o
 		}
 	}
 
-	return sym;
+	return sym ? sym->alias : NULL;
 }
 
 /*
@@ -266,11 +266,11 @@ int find_symbol_hole_containing(const struct section *sec, unsigned long offset)
 struct symbol *find_func_containing(struct section *sec, unsigned long offset)
 {
 	struct rb_root_cached *tree = (struct rb_root_cached *)&sec->symbol_tree;
-	struct symbol *iter;
+	struct symbol *func;
 
-	__sym_for_each(iter, tree, offset, offset) {
-		if (is_func_sym(iter))
-			return iter;
+	__sym_for_each(func, tree, offset, offset) {
+		if (is_func_sym(func))
+			return func->alias;
 	}
 
 	return NULL;
-- 
2.51.1