linux-kernel - [PATCH v2 14/19] objtool: Delete cleanup()

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Message-Id: <20200317170910.592855293@infradead.org>
Date:   Tue, 17 Mar 2020 18:02:48 +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 v2 14/19] objtool: Delete cleanup()

Perf shows we spend a measurable amount of time spend cleaning up
right before we exit anyway. Avoid the needsless work and just
terminate.

This reduces objtool on vmlinux.o runtime from 5.4s to 4.8s

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 tools/objtool/check.c |   19 -------------------
 1 file changed, 19 deletions(-)

--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2476,23 +2476,6 @@ static int validate_reachable_instructio
 	return 0;
 }
 
-static void cleanup(struct objtool_file *file)
-{
-	struct instruction *insn, *tmpinsn;
-	struct alternative *alt, *tmpalt;
-
-	list_for_each_entry_safe(insn, tmpinsn, &file->insn_list, list) {
-		list_for_each_entry_safe(alt, tmpalt, &insn->alts, list) {
-			list_del(&alt->list);
-			free(alt);
-		}
-		list_del(&insn->list);
-		hash_del(&insn->hash);
-		free(insn);
-	}
-	elf_close(file->elf);
-}
-
 static struct objtool_file file;
 
 int check(const char *_objname, bool orc)
@@ -2560,8 +2543,6 @@ int check(const char *_objname, bool orc
 	}
 
 out:
-	cleanup(&file);
-
 	if (ret < 0) {
 		/*
 		 *  Fatal error.  The binary is corrupt or otherwise broken in