linux-kernel - Re: [PATCH] coredump: kill mm->core

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Message-ID: <87tzekrdnm.fsf@saeurebad.de>
Date:	Sun, 20 Jul 2008 13:35:57 +0200
From:	Johannes Weiner <hannes@...urebad.de>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coredump: kill mm->core_done

Hi,

Oleg Nesterov <oleg@...sign.ru> writes:

> On 07/20, Johannes Weiner wrote:
>> 
>> Oleg Nesterov <oleg@...sign.ru> writes:
>> 
>> > --- 26-rc2/kernel/exit.c~5_KILL_CORE_DONE	2008-07-13 19:58:19.000000000 +0400
>> > +++ 26-rc2/kernel/exit.c	2008-07-15 17:06:58.000000000 +0400
>> > @@ -680,7 +680,13 @@ static void exit_mm(struct task_struct *
>> >  		if (atomic_dec_and_test(&core_state->nr_threads))
>> >  			complete(&core_state->startup);
>> >  
>> > -		wait_for_completion(&mm->core_done);
>> > +		for (;;) {
>> > +			set_task_state(tsk, TASK_UNINTERRUPTIBLE);
>> > +			if (!self.task) /* see coredump_finish() */
>> 
>> kernel/exit.c: In function `exit_mm':
>> kernel/exit.c:686: error: `self' undeclared (first use in this function)
>> kernel/exit.c:686: error: (Each undeclared identifier is reported only once
>> kernel/exit.c:686: error: for each function it appears in.)
>> make[1]: *** [kernel/exit.o] Error 1
>
> This is on top of other patches in -mm tree,
>
>          coredump-zap_threads-comments-use-while_each_thread.patch
>          introduce-pf_kthread-flag.patch
>          kill-pf_borrowed_mm-in-favour-of-pf_kthread.patch
>          coredump-zap_threads-must-skip-kernel-threads.patch
>          coredump-elf_core_dump-skip-kernel-threads.patch
>          coredump-turn-mm-core_startup_done-into-the-pointer-to-struct-core_state.patch
>          coredump-move-mm-core_waiters-into-struct-core_state.patch
>          coredump-simplify-core_state-nr_threads-calculation.patch
>          coredump-turn-core_state-nr_threads-into-atomic_t.patch
>          coredump-make-mm-core_state-visible-to-core_dump.patch
>          coredump-construct-the-list-of-coredumping-threads-at-startup-time.patch
>          coredump-elf_core_dump-use-core_state-dumper-list.patch
>          coredump-elf_fdpic_core_dump-use-core_state-dumper-list.patch
>          coredump-kill-mm-core_done.patch

Sorry, I should have given more information.

I was building -mm directly with all these patches applied.  I did not
cherry-pick this exact patch into some other tree.

But I still can not find anything defining `self' in these patches:

$ grep self coredump-*.patch \
	introduce-pf_kthread-flag.patch \
	kill-pf_borrowed_mm-in-favour-of-pf_kthread.patch
coredump-kill-mm-core_done.patch:+                      if (!self.task) /* see coredump_finish() */

cscope finds some other definitions of self in the tree, but nothing
relevant.

	Hannes
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