From: Andrew Morton <akpm@linux-foundation.org>
To: Brian Starkey <brian.starkey@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Dan Williams <dan.j.williams@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 4/4] drivers: dma-coherent: use memset_io for DMA_MEMORY_IO mappings
Date: Mon, 29 Feb 2016 15:17:49 -0800 [thread overview]
Message-ID: <20160229151749.a972ae993adffb667140548d@linux-foundation.org> (raw)
In-Reply-To: <7942c970d1071643f3763de6eaf6d55a3945a069.1456225103.git.brian.starkey@arm.com>
On Mon, 29 Feb 2016 16:09:24 +0000 Brian Starkey <brian.starkey@arm.com> wrote:
> Use memset_io() for DMA_MEMORY_IO mappings which are mapped as I/O
> memory, and regular memset() for DMA_MEMORY_MAP mappings.
>
> This fixes the below alignment fault on arm64 for DMA_MEMORY_IO
> mappings, where memset() uses the DC ZVA instruction which is
> invalid on device memory.
What's the urgency of this fix? "Hair on fire needed in stable asap"
or "Nice to have in there for 4.6" or what?
next prev parent reply other threads:[~2016-02-29 23:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 16:09 [PATCH v2 0/4] Fix kernel panic in dma-coherent allocations Brian Starkey
2016-02-29 16:09 ` [PATCH v2 1/4] memremap: don't modify flags Brian Starkey
2016-02-29 16:09 ` [PATCH v2 2/4] memremap: add MEMREMAP_WC flag Brian Starkey
2016-02-29 16:09 ` [PATCH v2 3/4] drivers: dma-coherent: use MEMREMAP_WC for DMA_MEMORY_MAP Brian Starkey
2016-02-29 16:09 ` [PATCH v2 4/4] drivers: dma-coherent: use memset_io for DMA_MEMORY_IO mappings Brian Starkey
2016-02-29 23:17 ` Andrew Morton [this message]
2016-03-01 9:03 ` Brian Starkey
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