linux-kernel - Re: [PATCH 01/10] exit/s390: Remove dead reference to do_exit from copy

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Message-ID: <87czm036ez.fsf@email.froward.int.ebiederm.org>
Date:   Mon, 13 Dec 2021 08:50:44 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Heiko Carstens <hca@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexey Gladkov <legion@...nel.org>,
        Kyle Huey <me@...ehuey.com>, Oleg Nesterov <oleg@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>
Subject: Re: [PATCH 01/10] exit/s390: Remove dead reference to do_exit from copy_thread

Heiko Carstens <hca@...ux.ibm.com> writes:

> On Wed, Dec 08, 2021 at 02:25:23PM -0600, Eric W. Biederman wrote:
>> My s390 assembly is not particularly good so I have read the history
>> of the reference to do_exit copy_thread and have been able to
>> verify that do_exit is not used.
>> 
>> The general argument is that s390 has been changed to use the generic
>> kernel_thread and kernel_execve and the generic versions do not call
>> do_exit.  So it is strange to see a do_exit reference sitting there.
>> 
>> The history of the do_exit reference in s390's version of copy_thread
>> seems conclusive that the do_exit reference is something that lingers
>> and should have been removed several years ago.
> ...
>> Remove this dead reference to do_exit to make it clear that s390 is
>> not doing anything with do_exit in copy_thread.
>>
>> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
>> ---
>>  arch/s390/kernel/process.c | 1 -
>>  1 file changed, 1 deletion(-)
>
> Applied to s390 tree. Just in case you want to apply this to your tree too:
> Acked-by: Heiko Carstens <hca@...ux.ibm.com>

Thank you for looking at this and confirming I had read that the code
properly and that the do_exit reference was no longer used.

I will probably take this through my tree as well just so I don't have
that trailing do_exit reference.

At this point I will give things a bit more for people to review or say
something about the other changes and if there is no negative feedback
I think I will just apply the lot.

Eric