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From: jszhang@marvell.com (Jisheng Zhang)
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 15:13:44 +0800	[thread overview]
Message-ID: <20160721151344.36e29858@xhacker> (raw)

Hi all,

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?

the fix is s/pgprot_noncached/pgprot_device in phys_mem_access_prot().

>From armv8 ARM, this mismatch seems not the so called mismatched memory
attributes?

Thanks,
Jisheng

             reply	other threads:[~2016-07-21  7:13 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-21  7:13 Jisheng Zhang [this message]
2016-07-21 16:03 ` [RFC] arm64: mm: use pgprot_device for device in phys_mem_access_prot Catalin Marinas
2016-07-22  6:58   ` Jisheng Zhang

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