linux-kernel - [RFC PATCH v3 06/12] objtool: Read special sections with alts only when specific options are selected

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Message-Id: <20220624183238.388144-7-sv@linux.ibm.com>
Date:   Sat, 25 Jun 2022 00:02:32 +0530
From:   Sathvika Vasireddy <sv@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     jpoimboe@...hat.com, peterz@...radead.org,
        linux-kernel@...r.kernel.org, aik@...abs.ru, mpe@...erman.id.au,
        christophe.leroy@...roup.eu, mingo@...hat.com, rostedt@...dmis.org,
        naveen.n.rao@...ux.vnet.ibm.com, sv@...ux.ibm.com, mbenes@...e.cz,
        benh@...nel.crashing.org, paulus@...ba.org
Subject: [RFC PATCH v3 06/12] objtool: Read special sections with alts only when specific options are selected

This patch reads special sections which have alternate
instructions, only when stackval or orc or uaccess or
noinstr options are passed to objtool.

Signed-off-by: Sathvika Vasireddy <sv@...ux.ibm.com>
---
 tools/objtool/check.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 7f0dc504dd92..98e869721bc4 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -2261,9 +2261,11 @@ static int decode_sections(struct objtool_file *file)
 	 * Must be before add_jump_destinations(), which depends on 'func'
 	 * being set for alternatives, to enable proper sibling call detection.
 	 */
-	ret = add_special_section_alts(file);
-	if (ret)
-		return ret;
+	if (opts.stackval || opts.orc || opts.uaccess || opts.noinstr) {
+		ret = add_special_section_alts(file);
+		if (ret)
+			return ret;
+	}
 
 	ret = add_jump_destinations(file);
 	if (ret)
-- 
2.25.1