lkml.org 
[lkml]   [2012]   [Jul]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [PATCH v4] mm: cma: add a simple kernel module as the helper to test CMA
Date
Hello,

On Wednesday, March 07, 2012 12:38 PM Barry Song wrote:

> From: Barry Song <Baohua.Song@csr.com>
>
> Any write request to /dev/cma_test will let the module to allocate memory from
> CMA, for example:
>
> 1st time
> $ echo 1024 > /dev/cma_test
> will require cma_test to request 1MB(1024KB)
> 2nd time
> $ echo 2048 > /dev/cma_test
> will require cma_test to request 2MB(2048KB)
>
> Any read request to /dev/cma_test will let the module to free the 1st valid
> memory from CMA, for example:
>
> 1st time
> $ cat /dev/cma_test
> will require cma_test to free the 1MB allocated in the first write request
> 2nd time
> $ cat /dev/cma_test
> will require cma_test to free the 2MB allocated in the second write request
>
> Signed-off-by: Barry Song <Baohua.Song@csr.com>
> ---
> tools/cma/Makefile | 13 +++++
> tools/cma/cma_test.c | 140 ++++++++++++++++++++++++++++++++++++++++++++++++++

I'm sorry for such a long delay in processing this patch, but I wanted first to be sure
that the core CMA code gets into mainline, then I got busy with other dma-mapping
related stuff.

IMHO the right place for such code is in drivers/misc instead of tools/cma.

This patch contains a kernel module source code so it should be put with other kernel
modules. tools/ directory is aimed to contain user space code useful for developing and
testing Linux kernel.

Make sure that you also add Greg Kroah-Hartman <gregkh@linuxfoundation.org> on CC:,
he maintains misc drivers.

> (snipped)

Best regards
--
Marek Szyprowski
Samsung Poland R&D Center




\
 
 \ /
  Last update: 2012-07-03 10:01    [W:1.947 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site