Subject: Re: 2.6.11-rc2-mm1
From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Reply-To: johnpol@2ka.mipt.ru
To: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@osdl.org>,
       greg@kroah.com, linux-kernel@vger.kernel.org
In-Reply-To: <58cb370e050125073464befe4@mail.gmail.com>
References: <20050124021516.5d1ee686.akpm@osdl.org>
	 <20050125125323.GA19055@infradead.org> <1106662284.5257.53.camel@uganda>
	 <20050125142356.GA20206@infradead.org> <1106666690.5257.97.camel@uganda>
	 <58cb370e050125073464befe4@mail.gmail.com>
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Organization: MIPT
Date: Tue, 25 Jan 2005 19:04:47 +0300
Message-Id: <1106669087.5257.100.camel@uganda>
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On Tue, 2005-01-25 at 16:34 +0100, Bartlomiej Zolnierkiewicz wrote:

> > There are no places like
> > lock a
> > lock b
> > unlock a
> > unlock b
> >=20
> > and if they are, then I'm completely wrong.
> >=20
> > What you see is only following:
> >=20
> > place 1:
> > lock a
> > lock b
> > unlock b
> > lock c
> > unlock c
> > unlock a
> >=20
> > place 2:
> > lock b
> > lock a
> > unlock a
> > lock c
> > unlock c
> > unlock b
>=20
> Ugh, now think about that:
>=20
> CPU0     CPU1
> place1:   place2:
> lock a      lock b
> < guess what happens here :-) >
> lock b      lock a
> ...             ...

:) he-he, such place are in add and remove routings, and they can not be
run simultaneously
in different CPUs.

And in other places they should go through the same lock(sdev or chain):
like=20
lock sdev_lock
lock chain
unclok chain=20
lock logic
unlock logic
unlock sdev_lock


lock sdev_lock
lock logic
unlock logic
lock chain
unclok chain=20
unlock sdev_lock

--=20
        Evgeniy Polyakov

Crash is better than data corruption -- Arthur Grabowski

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