linux-kernel - [PATCH v3] tools/objtool: Fix unnecessary jumps

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Date:   Wed, 12 Aug 2020 09:13:39 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v3] tools/objtool: Fix unnecessary jumps

Previously cleanup() function was called under the out label for both
fatal errors (ret < 0) and warnings.  Now that cleanup() function is
removed, the out label is no longer required. Remove it and return
immediately for the fatal errors with ret as return code and 0 for
warnings.

Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
---
 tools/objtool/check.c | 30 ++++++++++--------------------
 1 file changed, 10 insertions(+), 20 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index e034a8f..b9bfcb5 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2799,19 +2799,19 @@ int check(const char *_objname, bool orc)
 
 	ret = decode_sections(&file);
 	if (ret < 0)
-		goto out;
+		return ret;
 	warnings += ret;
 
 	if (list_empty(&file.insn_list))
-		goto out;
+		return ret;
 
 	if (vmlinux && !validate_dup) {
 		ret = validate_vmlinux_functions(&file);
 		if (ret < 0)
-			goto out;
+			return ret;
 
 		warnings += ret;
-		goto out;
+		return 0;
 	}
 
 	if (retpoline) {
@@ -2823,45 +2823,35 @@ int check(const char *_objname, bool orc)
 
 	ret = validate_functions(&file);
 	if (ret < 0)
-		goto out;
+		return ret;
 	warnings += ret;
 
 	ret = validate_unwind_hints(&file, NULL);
 	if (ret < 0)
-		goto out;
+		return ret;
 	warnings += ret;
 
 	if (!warnings) {
 		ret = validate_reachable_instructions(&file);
 		if (ret < 0)
-			goto out;
+			return ret;
 		warnings += ret;
 	}
 
 	if (orc) {
 		ret = create_orc(&file);
 		if (ret < 0)
-			goto out;
+			return ret;
 
 		ret = create_orc_sections(&file);
 		if (ret < 0)
-			goto out;
+			return ret;
 	}
 
 	if (file.elf->changed) {
 		ret = elf_write(file.elf);
 		if (ret < 0)
-			goto out;
-	}
-
-out:
-	if (ret < 0) {
-		/*
-		 *  Fatal error.  The binary is corrupt or otherwise broken in
-		 *  some way, or objtool itself is broken.  Fail the kernel
-		 *  build.
-		 */
-		return ret;
+			return ret;
 	}
 
 	return 0;
-- 
2.1.0