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

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Message-ID: <20080720123724.GA264@tv-sign.ru>
Date:	Sun, 20 Jul 2008 16:37:24 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Johannes Weiner <hannes@...urebad.de>
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

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

Oleg.

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