linux-kernel - [tip: objtool/core] objtool: Avoid iterating !text section symbols

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Date:   Wed, 22 Apr 2020 22:24:30 -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>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: objtool/core] objtool: Avoid iterating !text section symbols

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

Commit-ID:     32cd779457c84c3d0ef34f9b45854f1c876395dc
Gitweb:        https://git.kernel.org/tip/32cd779457c84c3d0ef34f9b45854f1c876395dc
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Mon, 23 Mar 2020 21:11:14 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Wed, 22 Apr 2020 23:10:08 +02:00

objtool: Avoid iterating !text section symbols

validate_functions() iterates all sections their symbols; this is
pointless to do for !text sections as they won't have instructions
anyway.

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/20200416115119.346582716@infradead.org
---
 tools/objtool/check.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 584f221..ef082a3 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2567,8 +2567,12 @@ static int validate_functions(struct objtool_file *file)
 	struct section *sec;
 	int warnings = 0;
 
-	for_each_sec(file, sec)
+	for_each_sec(file, sec) {
+		if (!(sec->sh.sh_flags & SHF_EXECINSTR))
+			continue;
+
 		warnings += validate_section(file, sec);
+	}
 
 	return warnings;
 }