linux-kernel - Re: still nfs problems [Was: Linux 2.6.37-rc8]

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Message-ID: <AANLkTi=SjMinMp+m726GS1iehj6cQgNy1RqSoUqKhjtv@mail.gmail.com>
Date:	Wed, 5 Jan 2011 15:28:53 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Marc Kleine-Budde <m.kleine-budde@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	Parisc List <linux-parisc@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: still nfs problems [Was: Linux 2.6.37-rc8]

On Wed, Jan 5, 2011 at 3:06 PM, Trond Myklebust
<Trond.Myklebust@...app.com> wrote:
>
> Yes. The fix I sent out was a call to invalidate_kernel_vmap_range(),
> which takes care of invalidating the cache prior to a virtual address
> read.
>
> My question was specifically about the write through the regular kernel
> mapping: according to Russell and my reading of the cachetlb.txt
> documentation, flush_dcache_page() is only guaranteed to have an effect
> on page cache pages.

I don't think that should ever matter. It's not like the hardware can
know whether it's a dcache page or not.

And if the sw implementation cares, it's doing something really odd.
But who knows - there's a lot of crap out there, and people sometimes
do really odd things to work around the brokenness of a VIVT cache
with aliases.

                       Linus
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