linux-kernel - [tip:sched/core] objtool: Add do_task

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Message-ID: <tip-c1fad9ef7ed14aad464972e6444e7a3bd5670f26@git.kernel.org>
Date:   Thu, 22 Sep 2016 22:33:43 -0700
From:   tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, peterz@...radead.org, jpoimboe@...hat.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        mingo@...nel.org, fengguang.wu@...el.com,
        linux-kernel@...r.kernel.org
Subject: [tip:sched/core] objtool: Add do_task_dead() to global noreturn
 list

Commit-ID:  c1fad9ef7ed14aad464972e6444e7a3bd5670f26
Gitweb:     http://git.kernel.org/tip/c1fad9ef7ed14aad464972e6444e7a3bd5670f26
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Thu, 22 Sep 2016 16:21:25 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 23 Sep 2016 07:28:05 +0200

objtool: Add do_task_dead() to global noreturn list

objtool reports the following new warning:

  kernel/exit.o: warning: objtool: do_exit() falls through to next function complete_and_exit()

The warning is caused by do_exit()'s new call to do_task_dead(), which
is a new "noreturn" function which objtool doesn't know about yet,
introduced by:

  9af6528ee9b6 ("sched/core: Optimize __schedule()")

( objtool has to know all the global noreturn functions so it can follow
  the control flow of any functions which call them.  Unfortunately they
  need to be hard-coded because there's no automated way to detect them. )

Reported-by: kbuild test robot <fengguang.wu@...el.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: kbuild-all@...org
Cc: tipbuild@...or.com
Link: http://lkml.kernel.org/r/20160922212125.zbuewckqll4yur25@treble
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/objtool/builtin-check.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index bd09d0e..143b6cd 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -175,6 +175,7 @@ static int __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"__stack_chk_fail",
 		"panic",
 		"do_exit",
+		"do_task_dead",
 		"__module_put_and_exit",
 		"complete_and_exit",
 		"kvm_spurious_fault",