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

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Message-ID: <87ljzwr8vv.fsf@saeurebad.de>
Date:	Sun, 20 Jul 2008 15:19:00 +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:
>> 
>> > 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:
>
> Because it was merged into -mm before the previous 4 patches by mistake,
> sorry.
>
> Just drop this one:
>
> 	http://userweb.kernel.org/~akpm/mmotm/broken-out/coredump-kill-mm-core_done.patch

Alright, thanks!

	Hannes
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