On Fri, Aug 03, 2018 at 04:05:35PM -0400, Tony Battersby wrote:
> For v3 of the patchset, I was also considering to add a note to the
> kernel-doc comments for dma_pool_create() to use dma_alloc_coherent()
> directly instead of a dma pool if the driver intends to allow userspace
> to mmap() the ret
For v3 of the patchset, I was also considering to add a note to the
kernel-doc comments for dma_pool_create() to use dma_alloc_coherent()
directly instead of a dma pool if the driver intends to allow userspace
to mmap() the returned pages, due to the new use of the _mapcount union
in struct page.
dma_pool_free() scales poorly when the pool contains many pages because
pool_find_page() does a linear scan of all allocated pages. Improve its
scalability by replacing the linear scan with virt_to_page() and storing
dmapool private data directly in 'struct page', thereby eliminating
'struct dma_p
