From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: David Laight <David.Laight@ACULAB.COM>,
"'Christophe Leroy'" <christophe.leroy@csgroup.eu>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
Stan Johnson <userm57@yahoo.com>,
Finn Thain <fthain@linux-m68k.org>
Subject: Re: [PATCH] powerpc: warn on emulation of dcbz instruction
Date: Fri, 17 Sep 2021 22:33:46 +1000 [thread overview]
Message-ID: <55941ad30ce5515e6955565e3fa155f6caa2a896.camel@kernel.crashing.org> (raw)
In-Reply-To: <2fc6953808854149965e60f340eca94b@AcuMS.aculab.com>
On Thu, 2021-09-16 at 14:36 +0000, David Laight wrote:
> > Does userspace accesses non-cached memory directly ?
>
>
> It probably can if a driver mmaps PCI space directly into user space.
>
> That certainly works on x86-64.
The posterchild for that is Xorg
Cheers,
Ben.
prev parent reply other threads:[~2021-09-17 12:39 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-15 14:31 [PATCH] powerpc: warn on emulation of dcbz instruction Christophe Leroy
2021-09-16 7:15 ` Benjamin Herrenschmidt
2021-09-16 7:16 ` Benjamin Herrenschmidt
2021-09-16 7:23 ` Christophe Leroy
2021-09-16 14:36 ` David Laight
2021-09-17 12:33 ` Benjamin Herrenschmidt [this message]
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