linux-kernel - Re: [PATCH v3 3/3] selftests: pidfd: add tests for PIDFD_SELF

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Message-ID: <a6f56949-7db2-4587-a3c7-3c583cba2fe4@linuxfoundation.org>
Date: Thu, 17 Oct 2024 13:37:06 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 John Hubbard <jhubbard@...dia.com>
Cc: Christian Brauner <christian@...uner.io>, Shuah Khan <shuah@...nel.org>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>,
 Suren Baghdasaryan <surenb@...gle.com>, Vlastimil Babka <vbabka@...e.cz>,
 pedro.falcato@...il.com, linux-kselftest@...r.kernel.org,
 linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
 linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
 Oliver Sang <oliver.sang@...el.com>, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3 3/3] selftests: pidfd: add tests for PIDFD_SELF_*

On 10/17/24 11:38, Lorenzo Stoakes wrote:
> On Thu, Oct 17, 2024 at 10:37:00AM -0700, John Hubbard wrote:
>> On 10/17/24 10:28 AM, Lorenzo Stoakes wrote:
>>> On Thu, Oct 17, 2024 at 10:17:54AM -0700, John Hubbard wrote:
>>>> On 10/17/24 5:06 AM, Lorenzo Stoakes wrote:
>> ...
>>>>> 	#ifndef __TOOLS_LINUX_PIDFD_H
>>>>> 	#define __TOOLS_LINUX_PIDFD_H
>>>>>
>>>>> 	/*
>>>>> 	 * Some systems have issues with the linux/fcntl.h import in linux/pidfd.h, so
>>>>> 	 * work around this by setting the header guard.
>>>>> 	 */
>>>>> 	#define _LINUX_FCNTL_H
>>>>> 	#include "../../../include/uapi/linux/pidfd.h"
>>>>> 	#undef _LINUX_FCNTL_H
>>>>>
>>>>> 	#endif /* __TOOLS_LINUX_PIDFD_H */
>>>>>
>>>>>
>>>>> Then the test code needs only to update the pidfd.h file to #include
>>>>> <linux/pidfd.h> and add a simple $(TOOLS_INCLUDES) to the CFLAGS += line in
>>>>> the pidfd self tests Makefile and we should be all good.
>>>>

I like this solution. I should have read this message first before
handling the others.

>>>> Yes.
>>>>
>>>>>
>>>>> That way we always import everything in this header correctly, we directly
>>>>> document this issue, we include the header as you would in userland and we
>>>>> should cover off all the issues?
>>>>
>>>> Very nice!
>>>
>>> Thanks!
>>>
>>> I saw from your other thread the idea was to take snapshots and to run scripts
>>> to compare etc. but I suppose putting this into the known-stub directory
>>
>> Actually, I'm not running scripts, because the only time things need to
>> change is when new selftests require a new include, or when something
>> changes that selftests depend on.
>>
>>> tools/include/linux rather than tools/include/uapi/linux would avoid a conflict
>>> here.
>>
>> This is the first time I've actually looked at tools/include/linux. That
>> sounds about right, though.
>>
>>>
>>> Or would you say the wrapper should regardless be in the uapi/linux directory?
>>>
>>
>> No, not if there is already a better location, as you pointed out.
> 
> OK perfect, I have a patch series ready to go with this (and addressing
> Christian's comments).
> 
> Shuah - if you are open to this approach then we should be good to go!

I am caught up with the discussion now. I am good with this change.

Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah