From: gregkh@linuxfoundation•org (Greg Kroah-Hartman)
To: linux-arm-kernel@lists•infradead.org
Subject: [RESEND2 PATCH 1/3] memremap: add MEMREMAP_WC flag
Date: Mon, 8 Feb 2016 10:30:06 -0800 [thread overview]
Message-ID: <20160208183006.GA8429@kroah.com> (raw)
In-Reply-To: <9085d37fa97a762a46b9d58719c085368682c64f.1454950917.git.brian.starkey@arm.com>
On Mon, Feb 08, 2016 at 05:30:50PM +0000, Brian Starkey wrote:
> Add a flag to memremap() for writecombine mappings. Mappings satisfied
> by this flag will not be cached, however writes may be delayed or
> combined into more efficient bursts. This is most suitable for
> buffers written sequentially by the CPU for use by other DMA devices.
>
> Signed-off-by: Brian Starkey <brian.starkey@arm•com>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm•com>
> ---
> include/linux/io.h | 1 +
> kernel/memremap.c | 15 +++++++++++++--
> 2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/io.h b/include/linux/io.h
> index 32403b5..e2c8419 100644
> --- a/include/linux/io.h
> +++ b/include/linux/io.h
> @@ -135,6 +135,7 @@ enum {
> /* See memremap() kernel-doc for usage description... */
> MEMREMAP_WB = 1 << 0,
> MEMREMAP_WT = 1 << 1,
> + MEMREMAP_WC = 1 << 2,
You didn't update the documentation :(
next prev parent reply other threads:[~2016-02-08 18:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-08 17:30 [RESEND2 PATCH 0/3] Fix kernel panic in dma-coherent Brian Starkey
2016-02-08 17:30 ` [RESEND2 PATCH 1/3] memremap: add MEMREMAP_WC flag Brian Starkey
2016-02-08 18:30 ` Greg Kroah-Hartman [this message]
2016-02-09 9:15 ` Brian Starkey
2016-02-16 11:14 ` Brian Starkey
2016-02-17 0:43 ` Greg Kroah-Hartman
2016-02-17 10:07 ` Brian Starkey
2016-02-08 20:03 ` Andrew Morton
2016-02-09 10:23 ` Brian Starkey
2016-02-17 11:53 ` Brian Starkey
2016-02-17 19:02 ` Andrew Morton
2016-02-08 17:30 ` [RESEND2 PATCH 2/3] drivers: dma-coherent: use MEMREMAP_WC for DMA_MEMORY_MAP Brian Starkey
2016-02-08 17:30 ` [RESEND2 PATCH 3/3] drivers: dma-coherent: use memset_io for DMA_MEMORY_IO mappings Brian Starkey
2016-02-08 17:50 ` [RESEND2 PATCH 0/3] Fix kernel panic in dma-coherent Mark Rutland
2016-02-08 17:59 ` Robin Murphy
2016-02-08 18:04 ` Mark Rutland
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