From: catalin.marinas@arm.com (Catalin Marinas)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] arm64: mm: use pgprot_device for device in phys_mem_access_prot
Date: Thu, 21 Jul 2016 17:03:00 +0100 [thread overview]
Message-ID: <20160721160300.GF16666@e104818-lin.cambridge.arm.com> (raw)
In-Reply-To: <20160721151344.36e29858@xhacker>
On Thu, Jul 21, 2016 at 03:13:44PM +0800, Jisheng Zhang wrote:
> Normally, in arm64, kernel driver maps register space as device nGnRE. But
> if we access the register space via. /dev/mem, then the mapping is
> device nGnRnE, is there a mismatch here?
Possibly, but the behaviour is not undefined. The nGnRnE may lose the nE
behaviour (which is a hint anyway, it may not be honoured).
/dev/mem is a pretty bad idea in general.
--
Catalin
next prev parent reply other threads:[~2016-07-21 16:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-21 7:13 [RFC] arm64: mm: use pgprot_device for device in phys_mem_access_prot Jisheng Zhang
2016-07-21 16:03 ` Catalin Marinas [this message]
2016-07-22 6:58 ` Jisheng Zhang
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