[Nouveau] [Bug 93458] page allocation failure: order:5, mode:0x240c0c0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93458

--- Comment #6 from Matt Whitlock <freedesktop at mattwhitlock.name> ---
(In reply to Matt Whitlock from comment #5)
> I would venture a guess that the memory allocated for a GPU FIFO buffer
> needs to be physically continuous, as it will be used for DMA

I take it back. Looking into the source code, the allocation is happening in
nvkm_ramht_new(…), which is allocating a struct nvkm_ramht containing a
variably-sized array of struct nvkm_ramht_data elements. As these elements, in
turn, contain pointers, it seems very unlikely that they'd be DMA'd, so
presumably the struct nvkm_ramht doesn't need to be physically contiguous and
could safely be allocated by vzalloc(…).

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