On Sun, 11 Nov 2018, Nicolas Boichat wrote:

SLAB_CACHE_DMA32 is only available after explicit kmem_cache_create calls,
no default cache is created for kmalloc. Add a test in check_slab_flags
for this.

This does not define the dma32 kmalloc array. Is that intentional? In that
case you need to fail any request for GFP_DMA32 coming in via kmalloc.