linux-kernel - Re: [PATCH AUTOSEL 5.4 025/350] objtool: add kunit_try_catch

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Date:   Tue, 10 Dec 2019 13:25:54 -0800
From:   Brendan Higgins <brendanhiggins@...gle.com>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org, kbuild test robot <lkp@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH AUTOSEL 5.4 025/350] objtool: add kunit_try_catch_throw to
 the noreturn list

On Tue, Dec 10, 2019 at 1:04 PM Sasha Levin <sashal@...nel.org> wrote:
>
> From: Brendan Higgins <brendanhiggins@...gle.com>
>
> [ Upstream commit 33adf80f5b52e3f7c55ad66ffcaaff93c6888aaa ]
>
> Fix the following warning seen on GCC 7.3:
>   kunit/test-test.o: warning: objtool: kunit_test_unsuccessful_try() falls through to next function kunit_test_catch()
>
> kunit_try_catch_throw is a function added in the following patch in this
> series; it allows KUnit, a unit testing framework for the kernel, to
> bail out of a broken test. As a consequence, it is a new __noreturn
> function that objtool thinks is broken (as seen above). So fix this
> warning by adding kunit_try_catch_throw to objtool's noreturn list.
>
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
> Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Link: https://www.spinics.net/lists/linux-kbuild/msg21708.html
> Cc: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

I don't think this change should be backported. This patch is to
ignore an erroneous warning introduced by KUnit; it serves no purpose
prior to the KUnit patches being merged.

> ---
>  tools/objtool/check.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/tools/objtool/check.c b/tools/objtool/check.c
> index 044c9a3cb2472..543c068096b12 100644
> --- a/tools/objtool/check.c
> +++ b/tools/objtool/check.c
> @@ -144,6 +144,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
>                 "usercopy_abort",
>                 "machine_real_restart",
>                 "rewind_stack_do_exit",
> +               "kunit_try_catch_throw",
>         };
>
>         if (!func)
> --
> 2.20.1
>