linux-kernel - [PATCH v3 17/26] objtool: Re-arrange validate

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Date:   Tue, 24 Mar 2020 16:31:30 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     tglx@...utronix.de, jpoimboe@...hat.com
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, peterz@...radead.org,
        mhiramat@...nel.org, mbenes@...e.cz, brgerst@...il.com
Subject: [PATCH v3 17/26] objtool: Re-arrange validate_functions()

In preparation to adding a vmlinux.o specific pass, rearrange some
code. No functional changes intended.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 tools/objtool/check.c |   60 ++++++++++++++++++++++++++++----------------------
 1 file changed, 34 insertions(+), 26 deletions(-)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2413,9 +2413,8 @@ static bool ignore_unreachable_insn(stru
 	return false;
 }
 
-static int validate_functions(struct objtool_file *file)
+static int validate_section(struct objtool_file *file, struct section *sec)
 {
-	struct section *sec;
 	struct symbol *func;
 	struct instruction *insn;
 	struct insn_state state;
@@ -2428,35 +2427,44 @@ static int validate_functions(struct obj
 	       CFI_NUM_REGS * sizeof(struct cfi_reg));
 	state.stack_size = initial_func_cfi.cfa.offset;
 
-	for_each_sec(file, sec) {
-		list_for_each_entry(func, &sec->symbol_list, list) {
-			if (func->type != STT_FUNC)
-				continue;
-
-			if (!func->len) {
-				WARN("%s() is missing an ELF size annotation",
-				     func->name);
-				warnings++;
-			}
-
-			if (func->pfunc != func || func->alias != func)
-				continue;
-
-			insn = find_insn(file, sec, func->offset);
-			if (!insn || insn->ignore || insn->visited)
-				continue;
-
-			state.uaccess = func->uaccess_safe;
-
-			ret = validate_branch(file, func, insn, state);
-			if (ret && backtrace)
-				BT_FUNC("<=== (func)", insn);
-			warnings += ret;
+	list_for_each_entry(func, &sec->symbol_list, list) {
+		if (func->type != STT_FUNC)
+			continue;
+
+		if (!func->len) {
+			WARN("%s() is missing an ELF size annotation",
+					func->name);
+			warnings++;
 		}
+
+		if (func->pfunc != func || func->alias != func)
+			continue;
+
+		insn = find_insn(file, sec, func->offset);
+		if (!insn || insn->ignore || insn->visited)
+			continue;
+
+		state.uaccess = func->uaccess_safe;
+
+		ret = validate_branch(file, func, insn, state);
+		if (ret && backtrace)
+			BT_FUNC("<=== (func)", insn);
+		warnings += ret;
 	}
 
 	return warnings;
 }
+
+static int validate_functions(struct objtool_file *file)
+{
+	struct section *sec;
+	int warnings = 0;
+
+	for_each_sec(file, sec)
+		warnings += validate_section(file, sec);
+
+	return warnings;
+}
 
 static int validate_reachable_instructions(struct objtool_file *file)
 {