linux-kernel - Re: X-freeze after clflush changes [Was: 2.6.23-rc6-mm1]

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Message-ID: <21d7e9970709191842h3111390cl8f09745bed6bd8f9@mail.gmail.com>
Date:	Thu, 20 Sep 2007 11:42:29 +1000
From:	"Dave Airlie" <airlied@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Jiri Slaby" <jirislaby@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: X-freeze after clflush changes [Was: 2.6.23-rc6-mm1]

> The code is broken anyways. If you free pages without flushing
> them first some other innocent user allocating them will end up
> with possible uncached pages for some time.
>
> Does this simple patch help?
>

I've attached a more complicated patch that does a 2 stage effort to
unmapping and freeing pages. My kernel no longer hangs with this
patch...

Jiri can you confirm?

I'll look at the other issue separately..

Dave.

View attachment "0001-agp-fix-race-condition-between-unmapping-and-freein.patch" of type "text/x-patch" (7796 bytes)