Re: [RFC PATCH] usb: host: xhci: allow __GFP_FS in dma allocation

[Christoph Hellwig]

On Mon, May 20, 2019 at 11:09:25AM +0200, Oliver Neukum wrote:
> we actually do. It is just higher up in the calling path:

Perfect!

> So, do we need to audit the mem_flags again?
> What are we supposed to use? GFP_KERNEL?

GFP_KERNEL if you can block, GFP_ATOMIC if you can't for a good reason,
that is the allocation is from irq context or under a spinlock.  If you
think you have a case where you think you don't want to block, but it
is not because of the above reasons we need to have a chat about the
details.