From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCHv2 1/2] ARM: dma-mapping: add support for CMA regions placed in highmem zone
Date: Mon, 4 Feb 2013 15:11:32 +0000 [thread overview]
Message-ID: <20130204151132.GF17786@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <xa1ta9rkb0od.fsf@mina86.com>
On Mon, Feb 04, 2013 at 03:42:26PM +0100, Michal Nazarewicz wrote:
> > On Mon, Feb 04, 2013 at 03:24:51PM +0100, Michal Nazarewicz wrote:
> >> Perhaps it should use lowmem_page_address() then?
>
> On Mon, Feb 04 2013, Russell King - ARM Linux wrote:
> > It's well defined that page_address() will be non-NULL for lowmem pages.
> > There is nothing wrong with the above.
>
> It would save on a branch and a function call though.
Depending on the size of struct page, if we care that much, we can probably
enable WANT_PAGE_VIRTUAL which'll make it even cheaper as it's just a
dereference.
next prev parent reply other threads:[~2013-02-04 15:11 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-16 15:31 [PATCH 0/2] ARM: dma-mapping: add highmem support for coherent allocation Marek Szyprowski
2013-01-16 15:31 ` [PATCH 1/2] ARM: dma-mapping: add support for CMA regions placed in highmem zone Marek Szyprowski
2013-02-04 13:23 ` [PATCHv2 " Marek Szyprowski
2013-02-04 13:51 ` Michal Nazarewicz
2013-02-04 14:10 ` Russell King - ARM Linux
2013-02-04 14:24 ` Michal Nazarewicz
2013-02-04 14:34 ` Russell King - ARM Linux
2013-02-04 14:42 ` Michal Nazarewicz
2013-02-04 15:11 ` Russell King - ARM Linux [this message]
2013-02-04 14:41 ` Michal Nazarewicz
2013-02-07 14:59 ` [PATCHv3 " Marek Szyprowski
2013-01-16 15:31 ` [PATCH 2/2] ARM: dma-mapping: use himem for DMA buffers for IOMMU-mapped devices Marek Szyprowski
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