linux-kernel - [PATCH v2 15/62] objtool: Add empty symbols to the symbol tree again

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Message-ID: <a47646ab877c2a48dc930ca02ea0a52fe4745fa3.1746821544.git.jpoimboe@kernel.org>
Date: Fri,  9 May 2025 13:16:39 -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>
Subject: [PATCH v2 15/62] objtool: Add empty symbols to the symbol tree again

The following commit

  5da6aea375cd ("objtool: Fix find_{symbol,func}_containing()")

fixed the issue where overlapping symbols weren't getting sorted
properly in the symbol tree.  Therefore the workaround to skip adding
empty symbols from the following commit

  a2e38dffcd93 ("objtool: Don't add empty symbols to the rbtree")

is no longer needed.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 tools/objtool/elf.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 19e249f4783c..a8a78b55d3ec 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -96,7 +96,8 @@ static inline unsigned long __sym_last(struct symbol *s)
 }
 
 INTERVAL_TREE_DEFINE(struct symbol, node, unsigned long, __subtree_last,
-		     __sym_start, __sym_last, static, __sym)
+		     __sym_start, __sym_last, static inline __maybe_unused,
+		     __sym)
 
 #define __sym_for_each(_iter, _tree, _start, _end)			\
 	for (_iter = __sym_iter_first((_tree), (_start), (_end));	\
@@ -440,13 +441,6 @@ static void elf_add_symbol(struct elf *elf, struct symbol *sym)
 	list_add(&sym->list, entry);
 	elf_hash_add(symbol, &sym->hash, sym->idx);
 	elf_hash_add(symbol_name, &sym->name_hash, str_hash(sym->name));
-
-	/*
-	 * Don't store empty STT_NOTYPE symbols in the rbtree.  They
-	 * can exist within a function, confusing the sorting.
-	 */
-	if (!sym->len)
-		__sym_remove(sym, &sym->sec->symbol_tree);
 }
 
 static int read_symbols(struct elf *elf)
-- 
2.49.0