linux-kernel - [tip: objtool/core] objtool: Rearrange validate

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Date:   Thu, 23 Apr 2020 07:49:34 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: objtool/core] objtool: Rearrange validate_section()

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     4b5e2e7ffef87ae864f3f4546ee5753556e7550b
Gitweb:        https://git.kernel.org/tip/4b5e2e7ffef87ae864f3f4546ee5753556e7550b
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 23 Mar 2020 21:17:50 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Wed, 22 Apr 2020 10:53:51 +02:00

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>
Reviewed-by: Miroslav Benes <mbenes@...e.cz>
Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lkml.kernel.org/r/20200416115119.405863817@infradead.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/objtool/check.c | 51 +++++++++++++++++++++++-------------------
 1 file changed, 29 insertions(+), 22 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index e201aa1..f49bf83 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2486,12 +2486,37 @@ static bool ignore_unreachable_insn(struct instruction *insn)
 	return false;
 }
 
-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;
 
 	/*
 	 * We need the full vmlinux for noinstr validation, otherwise we can
@@ -2505,31 +2530,13 @@ static int validate_section(struct objtool_file *file, struct section *sec)
 		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;
-
 		clear_insn_state(&state);
 		state.cfi.cfa = initial_func_cfi.cfa;
 		memcpy(&state.cfi.regs, &initial_func_cfi.regs,
 		       CFI_NUM_REGS * sizeof(struct cfi_reg));
 		state.cfi.stack_size = initial_func_cfi.cfa.offset;
 
-		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;