Re: User space memory

2013-03-12 Thread Prabhu nath
On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de wrote: Hi all, I have some problems allocation Memory the right way and use it in my kernel module. I use a char device for reading and writing from/to a pcie dma card. Especially the read function makes me some headache.

Re: User space memory

2013-03-12 Thread Valdis . Kletnieks
On Tue, 12 Mar 2013 18:38:05 +0530, Prabhu nath said: On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de wrote: I use a char device for reading and writing from/to a pcie dma card. Especially the read function makes me some headache. The user allocates some memory with

Re: User space memory

2013-03-12 Thread Christoph Seitz
Am 12.03.2013 14:08, schrieb Prabhu nath: On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de mailto:c.se...@tu-bs.de wrote: Hi all, I have some problems allocation Memory the right way and use it in my kernel module. I use a char device for reading

Re: User space memory

2013-03-12 Thread Valdis . Kletnieks
On Tue, 12 Mar 2013 15:03:53 +0100, Christoph Seitz said: I found out, if I use the force flag with get_user_pages, the pages get faulted, but there has to be a nicer way than using the force flag. Why does there have to be a nicer way? Maybe you already got the nice way. (Hint - why does

Re: User space memory

2013-03-12 Thread Prabhu nath
On Tue, Mar 12, 2013 at 7:59 PM, valdis.kletni...@vt.edu wrote: On Tue, 12 Mar 2013 18:38:05 +0530, Prabhu nath said: On Sun, Mar 10, 2013 at 11:30 PM, Christoph Seitz c.se...@tu-bs.de wrote: I use a char device for reading and writing from/to a pcie dma card. Especially the read

User space memory

2013-03-10 Thread Christoph Seitz
Hi all, I have some problems allocation Memory the right way and use it in my kernel module. I use a char device for reading and writing from/to a pcie dma card. Especially the read function makes me some headache. The user allocates some memory with posix_memalign and call the read function on