linux-kernel - Re: [paulmck-rcu:dev.2021.12.02a 30/43] kernel/kcsan/selftest.c:172:34: error: implicit declaration of function 'clear_bit_unlock_is_negative

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Date:   Mon, 6 Dec 2021 07:44:49 +0100
From:   Marco Elver <elver@...gle.com>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: Re: [paulmck-rcu:dev.2021.12.02a 30/43] kernel/kcsan/selftest.c:172:34:
 error: implicit declaration of function 'clear_bit_unlock_is_negative_byte'

On Sun, 5 Dec 2021 at 00:09, kernel test robot <lkp@...el.com> wrote:
[...]
>    kernel/kcsan/selftest.c: In function 'test_barrier':
> >> kernel/kcsan/selftest.c:172:34: error: implicit declaration of function 'clear_bit_unlock_is_negative_byte' [-Werror=implicit-function-declaration]
>      172 |         KCSAN_CHECK_READ_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var));
>          |                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    kernel/kcsan/selftest.c:136:17: note: in definition of macro '__KCSAN_CHECK_BARRIER'
>      136 |                 barrier;                                                                        \
>          |                 ^~~~~~~
>    kernel/kcsan/selftest.c:172:9: note: in expansion of macro 'KCSAN_CHECK_READ_BARRIER'
>      172 |         KCSAN_CHECK_READ_BARRIER(clear_bit_unlock_is_negative_byte(0, &test_var));
>          |         ^~~~~~~~~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors

Fixed by: https://lore.kernel.org/all/20211206064151.3337384-2-elver@google.com/

Thanks,
-- Marco