2013/7/29 Vinod Koul <vinod.k...@intel.com>: > On Thu, Jul 25, 2013 at 10:22:50AM +0800, Xiang Wang wrote: > > Btw its generally a good idea to remove the parts not required for further > discussion > >> Would you please explain a little more about why we should use >> GFP_NOWAIT here? This memory is not dedicated for DMA controller. Do >> we have special reasons to use GFP_NOWAIT? Thanks! > There are few reasons > - the dma requests can be triggered from atomic context > - so for above you can argue to use the GFP_ATOMIC and the guideline for dma > drivers [1] was discussed briefly > > ~Vinod > [1]: http://lkml.indiana.edu/hypermail/linux/kernel/0911.1/02316.html > > -- Hi, Vinod Thanks for your explanation. But want to double confirm with you that the memory alloc in my patch is in probe function, still need to use GFP_NOWAIT? Thanks!
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