linux-kernel - Re: [PATCH 05/10] exit: Stop exporting do

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Message-ID: <87zgo94xpn.fsf@email.froward.int.ebiederm.org>
Date:   Wed, 05 Jan 2022 16:36:04 -0600
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Al Viro <viro@...iv.linux.org.uk>
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>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 05/10] exit: Stop exporting do_exit

Al Viro <viro@...iv.linux.org.uk> writes:

> On Wed, Dec 08, 2021 at 02:25:27PM -0600, Eric W. Biederman wrote:
>> Now that there are no more modular uses of do_exit remove the EXPORT_SYMBOL.
>> 
>> Suggested-by: Christoph Hellwig <hch@...radead.org>
>> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
>> ---
>>  kernel/exit.c | 1 -
>>  1 file changed, 1 deletion(-)
>> 
>> diff --git a/kernel/exit.c b/kernel/exit.c
>> index f975cd8a2ed8..57afac845a0a 100644
>> --- a/kernel/exit.c
>> +++ b/kernel/exit.c
>> @@ -843,7 +843,6 @@ void __noreturn do_exit(long code)
>>  	lockdep_free_task(tsk);
>>  	do_task_dead();
>>  }
>> -EXPORT_SYMBOL_GPL(do_exit);
>
> "Now" in the commit message is misleading, AFAICS - there's no such users
> in the mainline right now (and yes, that one could be moved all the way
> up).

Yes.  I should have said.  Now there are few enough users of do_exit
that I can inspect the code and see there are no more modular users.

Or words to that effect.

Because honestly my make_task_dead change got rid of most of the callers
of do_exit.

Eric