On Fri 23-11-18 13:23:41, Vlastimil Babka wrote:

On 11/22/18 9:23 AM, Christoph Hellwig wrote:

[...]

quoted

But I do agree with the sentiment of not wanting to spread GFP_DMA32
futher into the slab allocator.

I don't see a problem with GFP_DMA32 for custom caches. Generic
kmalloc() would be worse, since it would have to create a new array of
kmalloc caches. But that's already ruled out due to the alignment.

Yes that makes quite a lot of sense to me. We do not really need a
generic support. Just make sure that if somebody creates a GFP_DMA32
restricted cache then allow allocating restricted memory from that.

Is there any fundamental reason that this wouldn't be possible?
-- 
Michal Hocko
SUSE Labs