Re: change kmalloc into vmalloc for large memory allocations
From: "'gregkh@linuxfoundation.org'" <gregkh@linuxfoundation.org>
Date: 2014-02-28 16:33:04
Also in:
alsa-devel, linux-arm-kernel, linux-arm-msm, linux-input, netfilter-devel
Possibly related (same subject, not in this thread)
- 2014-03-03 · Re: change kmalloc into vmalloc for large memory allocations · Wang, Yalin <hidden>
- 2014-02-28 · Re: change kmalloc into vmalloc for large memory allocations · Takashi Iwai <hidden>
- 2014-02-28 · Re: change kmalloc into vmalloc for large memory allocations · Steven Rostedt <rostedt@goodmis.org>
On Fri, Feb 28, 2014 at 05:20:08PM +0800, Wang, Yalin wrote:
Hi Yeah, Dma buffer must be allocated by kmalloc, But the modules I list should can all be changed to use vmalloc, because the buffer is only used by software, Not by any hardware .
Are you sure about that? The USB gadget driver needs DMA memory from what I can tell, have you tried your change out on a system that does not allow the USB controller to access non-DMA memory? And I agree with Steve, just fix the individual drivers, don't do a "hidden" change of where the memory is allocated from, that's not a good idea and will cause problems later. greg k-h