[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20090117174224.GA1409@ucw.cz>
Date: Sat, 17 Jan 2009 18:42:25 +0100
From: Pavel Machek <pavel@...e.cz>
To: Suresh Siddha <suresh.b.siddha@...el.com>
Cc: "H. Peter Anvin" <hpa@...or.com>, "mingo@...e.hu" <mingo@...e.hu>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"tvignaud@...driva.com" <tvignaud@...driva.com>
Subject: Re: [patch] x86, pat: fix reserve_memtype() for legacy 1MB range
On Fri 2009-01-09 14:48:04, Suresh Siddha wrote:
> On Fri, Jan 09, 2009 at 02:39:31PM -0800, H. Peter Anvin wrote:
> > Suresh Siddha wrote:
> > >
> > > Here X is trying to map first 8KB of memory using /dev/mem. Existing
> > > code treats first 0-4KB of memory as non-RAM and 4KB-8KB as RAM. Recent
> > > code changes don't allow to map memory with different attributes
> > > at the same time.
> > >
> >
> > Why was 0-4 KB marked as non-RAM? It is most definitely RAM, and should
> > be WB.
>
> While in reality it is RAM, we have CONFIG_STRICT_DEVMEM which doesn't allow
> apps to map RAM pages using /dev/mem. And to allow app's to map the
> legacy 0-4KB bios data page, we consider it as non-RAM.
Fix config_strict_devmem? Ram is ram, and we should not li for
strict_devmem benefit...
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists