linux-kernel - Re: [PATCH v5 2/5] pidfd: add PIDFD_SELF_* sentinels to refer to own thread/process

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Message-ID: <828674d9-e862-4438-86b6-61977f4cf3b5@nvidia.com>
Date: Fri, 25 Oct 2024 10:41:21 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Pedro Falcato <pedro.falcato@...il.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.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>,
 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>
Subject: Re: [PATCH v5 2/5] pidfd: add PIDFD_SELF_* sentinels to refer to own
 thread/process

On 10/25/24 5:50 AM, Pedro Falcato wrote:
> On Fri, Oct 25, 2024 at 10:41 AM Lorenzo Stoakes
> <lorenzo.stoakes@...cle.com> wrote:
...
>> +static inline int pidfd_is_self_sentinel(pid_t pid)
>> +{
>> +       return pid == PIDFD_SELF_THREAD || pid == PIDFD_SELF_THREAD_GROUP;
>> +}
> 
> Do we want this in the uapi header? Even if this is useful, it might
> come with several drawbacks such as breaking scripts that parse kernel
> headers (and a quick git grep suggests we do have static inlines in
> headers, but in rather obscure ones) and breaking C89:
> 

Let's please not say "C89" anymore, we've moved on! :)

The notes in [1], which is now nearly 2.5 years old, discuss the move to
C11, and specifically how to handle the inline keyword.

I think it's quite clear at this point, that we should not hold up new
work, based on concerns about handling the inline keyword, nor about
C89.

[1] commit e8c07082a810 ("Kbuild: move to -std=gnu11")

thanks,
-- 
John Hubbard

 > <source>:8:8: error: unknown type name 'inline'
 >      8 | static inline int pidfd_is_self_sentinel(pid_t pid)
 >
 > :)
 >