linux-kernel - Re: [PATCH v3 5/8] objtool: Check local label about sibling call

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Message-ID: <20231020093031.GB31411@noisy.programming.kicks-ass.net>
Date:   Fri, 20 Oct 2023 11:30:31 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v3 5/8] objtool: Check local label about sibling call

On Fri, Oct 20, 2023 at 10:26:58AM +0800, Tiezhu Yang wrote:

> +		if (reloc && reloc->sym->type == STT_NOTYPE &&
> +		    strncmp(reloc->sym->name, ".L", 2) == 0)

> +			if (reloc->sym->type == STT_NOTYPE &&
> +			    strncmp(reloc->sym->name, ".L", 2) == 0) {

Would not something like the below be better?

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index e308d1ba664e..a57d293c834d 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2506,6 +2506,9 @@ static int classify_symbols(struct objtool_file *file)
 	struct symbol *func;
 
 	for_each_sym(file, func) {
+		if (func->type == STT_NOTYPE && strstarts(func->name, ".L"))
+			func->local_label = true;
+
 		if (func->bind != STB_GLOBAL)
 			continue;
 
diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h
index 9f71e988eca4..2b8a69de4db8 100644
--- a/tools/objtool/include/objtool/elf.h
+++ b/tools/objtool/include/objtool/elf.h
@@ -67,6 +67,7 @@ struct symbol {
 	u8 profiling_func    : 1;
 	u8 warned	     : 1;
 	u8 embedded_insn     : 1;
+	u8 local_label       : 1;
 	struct list_head pv_target;
 	struct reloc *relocs;
 };