linux-kernel - Re: kernel/kcov.c:635:32: error: 'KCOV_MODE

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Date: Fri, 21 Jun 2024 12:18:44 +0200
From: Aleksandr Nogikh <nogikh@...gle.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Andrew Morton <akpm@...ux-foundation.org>, 
	Linux Memory Management List <linux-mm@...ck.org>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Andrey Konovalov <andreyknvl@...il.com>
Subject: Re: kernel/kcov.c:635:32: error: 'KCOV_MODE_REMOTE' undeclared

On Thu, Jun 20, 2024 at 9:53 AM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   e5b3efbe1ab1793bb49ae07d56d0973267e65112
> commit: 01c8f9806bde438ca1c8cbbc439f0a14a6694f6c kcov: don't lose track of remote references during softirqs
> date:   5 days ago
> config: x86_64-randconfig-014-20240202 (https://download.01.org/0day-ci/archive/20240620/202406201538.SMBucNWT-lkp@intel.com/config)
> compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240620/202406201538.SMBucNWT-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202406201538.SMBucNWT-lkp@intel.com/
>

I was unable to reproduce the problem with the attached config/script.

> All errors (new ones prefixed by >>):
>
>          |                     ^~
>    include/asm-generic/rwonce.h:55:27: note: in definition of macro '__WRITE_ONCE'
>       55 |         *(volatile typeof(x) *)&(x) = (val);                            \
>          |                           ^
>    kernel/kcov.c:363:9: note: in expansion of macro 'WRITE_ONCE'
>      363 |         WRITE_ONCE(t->kcov_mode, KCOV_MODE_DISABLED);
>          |         ^~~~~~~~~~
>    kernel/kcov.c:363:21: error: 'struct task_struct' has no member named 'kcov_mode'
>      363 |         WRITE_ONCE(t->kcov_mode, KCOV_MODE_DISABLED);

It looks as if CONFIG_KCOV is not enabled, but
1) It is enabled in the attached config file.
2) If it's not enabled, the kernel/kcov.c file should not have been
compiled in the first place.

>          |                     ^~
>    include/asm-generic/rwonce.h:55:34: note: in definition of macro '__WRITE_ONCE'
>       55 |         *(volatile typeof(x) *)&(x) = (val);                            \
>          |                                  ^
>    kernel/kcov.c:363:9: note: in expansion of macro 'WRITE_ONCE'
>      363 |         WRITE_ONCE(t->kcov_mode, KCOV_MODE_DISABLED);
>          |         ^~~~~~~~~~
>    kernel/kcov.c:363:34: error: 'KCOV_MODE_DISABLED' undeclared (first use in this function); did you mean 'KCOV_DISABLE'?
>      363 |         WRITE_ONCE(t->kcov_mode, KCOV_MODE_DISABLED);

This looks again as if CONFIG_KCOV is not set (and there follow the
same two conclusions).

-- 
Aleksandr