Messages in this thread | | | From | Marek Szyprowski <> | Subject | RE: [PATCH v4] mm: cma: add a simple kernel module as the helper to test CMA | Date | Tue, 03 Jul 2012 09:20:29 +0200 |
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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
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