linux-kernel - [PATCH] objtool, module: discard _

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Message-Id: <863b50ccad9182c0529c63b0ae7bceb3b3fafc69.1488380822.git.jpoimboe@redhat.com>
Date:   Wed,  1 Mar 2017 09:20:03 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>, Jessica Yu <jeyu@...hat.com>
Subject: [PATCH] objtool, module: discard __unreachable section for modules

The __unreachable section is only used at compile time.  It's discarded
for vmlinux but it should also be discarded for modules.

Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 scripts/module-common.lds | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/module-common.lds b/scripts/module-common.lds
index 73a2c7d..936a3c6 100644
--- a/scripts/module-common.lds
+++ b/scripts/module-common.lds
@@ -4,7 +4,10 @@
  * combine them automatically.
  */
 SECTIONS {
-	/DISCARD/ : { *(.discard) }
+	/DISCARD/ : {
+		*(.discard)
+		*(__unreachable)
+	}
 
 	__ksymtab		0 : { *(SORT(___ksymtab+*)) }
 	__ksymtab_gpl		0 : { *(SORT(___ksymtab_gpl+*)) }
-- 
2.7.4