linux-kernel - [PATCH v3 25/26] objtool: Rearrange validate

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Message-Id: <20200324160925.410651737@infradead.org>
Date:   Tue, 24 Mar 2020 16:31:38 +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 25/26] objtool: Rearrange validate_section()

In preparation of further changes, once again break out the loop body.
No functional changes intended.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 tools/objtool/check.c |   51 ++++++++++++++++++++++++++++----------------------
 1 file changed, 29 insertions(+), 22 deletions(-)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2552,12 +2552,37 @@ static void prepare_insn_rela(struct obj
 	}
 }
 
-static int validate_section(struct objtool_file *file, struct section *sec)
+static int validate_symbol(struct objtool_file *file, struct section *sec,
+			   struct symbol *sym, struct insn_state *state)
 {
-	struct symbol *func;
 	struct instruction *insn;
+	int ret;
+
+	if (!sym->len) {
+		WARN("%s() is missing an ELF size annotation", sym->name);
+		return 1;
+	}
+
+	if (sym->pfunc != sym || sym->alias != sym)
+		return 0;
+
+	insn = find_insn(file, sec, sym->offset);
+	if (!insn || insn->ignore || insn->visited)
+		return 0;
+
+	state->uaccess = sym->uaccess_safe;
+
+	ret = validate_branch(file, insn->func, insn, *state);
+	if (ret && backtrace)
+		BT_FUNC("<=== (sym)", insn);
+	return ret;
+}
+
+static int validate_section(struct objtool_file *file, struct section *sec)
+{
 	struct insn_state state;
-	int ret, warnings = 0;
+	struct symbol *func;
+	int warnings = 0;
 
 	clear_insn_state(&state);
 
@@ -2581,25 +2606,7 @@ static int validate_section(struct objto
 		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;
+		warnings += validate_symbol(file, sec, func, &state);
 	}
 
 	return warnings;