On 11/9/2015 8:48 AM, Timur Tabi wrote:
Sinan Kaya wrote:
And why kmalloc anyway? Why not leave it on the stack?
char src[] = "hello world";
?
I need to call dma_map_single on this address to convert it to a DMA
address. That's why.
And you can't do that with an object that's on the stack?
no, pasting from here.
https://www.kernel.org/doc/Documentation/DMA-API-HOWTO.txt
under 'What memory is DMA'able?'
This rule also means that you may use neither kernel image addresses
(items in data/text/bss segments), nor module image addresses, nor
stack addresses for DMA.
--
Sinan Kaya
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project
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