linux-kernel - Re: kernel/context_tracking.c:80: warning: Function parameter or member 'state' not described in '__ct_user

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Date:   Tue, 5 Dec 2023 14:15:54 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     paulmck@...nel.org, kernel test robot <lkp@...el.com>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>
Subject: Re: kernel/context_tracking.c:80: warning: Function parameter or
 member 'state' not described in '__ct_user_enter'



On 12/4/23 20:38, Paul E. McKenney wrote:
> On Mon, Dec 04, 2023 at 08:02:33PM +0800, kernel test robot wrote:
>> Hi Frederic,
>>
>> FYI, the error/warning still remains.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   33cc938e65a98f1d29d0a18403dbbee050dcad9a
>> commit: e67198cc05b8ecbb7b8e2d8ef9fb5c8d26821873 context_tracking: Take idle eqs entrypoints over RCU
>> date:   1 year, 5 months ago
>> config: x86_64-buildonly-randconfig-006-20230906 (https://download.01.org/0day-ci/archive/20231204/202312041922.YZCcEPYD-lkp@intel.com/config)
>> compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
>> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231204/202312041922.YZCcEPYD-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/202312041922.YZCcEPYD-lkp@intel.com/
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> kernel/context_tracking.c:80: warning: Function parameter or member 'state' not described in '__ct_user_enter'
>>>> kernel/context_tracking.c:184: warning: Function parameter or member 'state' not described in '__ct_user_exit'
> 
> Does the patch below help?

Yes. Thanks.

Tested-by: Randy Dunlap <rdunlap@...radead.org>
Acked-by: Randy Dunlap <rdunlap@...radead.org>


> 
> 							Thanx, Paul
> 
> ------------------------------------------------------------------------
> 
> commit 9d879548a8cc89e5fdb0d806fc20887d67991c10
> Author: Paul E. McKenney <paulmck@...nel.org>
> Date:   Mon Dec 4 20:34:58 2023 -0800
> 
>     context_tracking: Fix kerneldoc headers for __ct_user_{enter,exit}()
>     
>     Document the "state" parameter of both of these functions.
>     
>     Reported-by: kernel test robot <lkp@...el.com>
>     Closes: https://lore.kernel.org/oe-kbuild-all/202312041922.YZCcEPYD-lkp@intel.com/
>     Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
>     Cc: Frederic Weisbecker <frederic@...nel.org>
> 
> diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
> index 6ef0b35fc28c..70ae70d03823 100644
> --- a/kernel/context_tracking.c
> +++ b/kernel/context_tracking.c
> @@ -458,6 +458,8 @@ static __always_inline void context_tracking_recursion_exit(void)
>   * __ct_user_enter - Inform the context tracking that the CPU is going
>   *		     to enter user or guest space mode.
>   *
> + * @state: userspace context-tracking state to enter.
> + *
>   * This function must be called right before we switch from the kernel
>   * to user or guest space, when it's guaranteed the remaining kernel
>   * instructions to execute won't use any RCU read side critical section
> @@ -595,6 +597,8 @@ NOKPROBE_SYMBOL(user_enter_callable);
>   * __ct_user_exit - Inform the context tracking that the CPU is
>   *		    exiting user or guest mode and entering the kernel.
>   *
> + * @state: userspace context-tracking state being exited from.
> + *
>   * This function must be called after we entered the kernel from user or
>   * guest space before any use of RCU read side critical section. This
>   * potentially include any high level kernel code like syscalls, exceptions,

-- 
~Randy