On Fri, Feb 11, 2022 at 3:34 AM Joao Martins <joao.m.martins@xxxxxxxxxx> wrote: > > In support of using compound pages for devmap mappings, plumb the pgmap > down to the vmemmap_populate implementation. Note that while altmap is > retrievable from pgmap the memory hotplug code passes altmap without > pgmap[*], so both need to be independently plumbed. > > So in addition to @altmap, pass @pgmap to sparse section populate > functions namely: > > sparse_add_section > section_activate > populate_section_memmap > __populate_section_memmap > > Passing @pgmap allows __populate_section_memmap() to both fetch the > vmemmap_shift in which memmap metadata is created for and also to let > sparse-vmemmap fetch pgmap ranges to co-relate to a given section and pick > whether to just reuse tail pages from past onlined sections. > > While at it, fix the kdoc for @altmap for sparse_add_section(). > > [*] https://lore.kernel.org/linux-mm/20210319092635.6214-1-osalvador@xxxxxxx/ > > Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx> > Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx> Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx> Thanks.
