On 16.03.20 11:21, Baoquan He wrote: > This change makes populate_section_memmap()/depopulate_section_memmap > much simpler. > > Suggested-by: Michal Hocko <mhocko@xxxxxxxxxx> > Signed-off-by: Baoquan He <bhe@xxxxxxxxxx> > Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> > Acked-by: Michal Hocko <mhocko@xxxxxxxx> > --- > v3->v4: > Split the old v3 into two patches, to carve out the using 'nid' > as preferred node to allocate memmap into a separate patch. This > is suggested by Michal, and the carving out is put in patch 2. > > v2->v3: > Remove __GFP_NOWARN and use array_size when calling kvmalloc_node() > per Matthew's comments. > http://lkml.kernel.org/r/20200312141749.GL27711@MiWiFi-R3L-srv > > mm/sparse.c | 27 +++------------------------ > 1 file changed, 3 insertions(+), 24 deletions(-) > > diff --git a/mm/sparse.c b/mm/sparse.c > index e747a238a860..d01d09cc7d99 100644 > --- a/mm/sparse.c > +++ b/mm/sparse.c > @@ -719,35 +719,14 @@ static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) > struct page * __meminit populate_section_memmap(unsigned long pfn, > unsigned long nr_pages, int nid, struct vmem_altmap *altmap) > { > - struct page *page, *ret; > - unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION; > - > - page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size)); > - if (page) > - goto got_map_page; > - > - ret = vmalloc(memmap_size); > - if (ret) > - goto got_map_ptr; > - > - return NULL; > -got_map_page: > - ret = (struct page *)pfn_to_kaddr(page_to_pfn(page)); > -got_map_ptr: > - > - return ret; > + return kvmalloc(array_size(sizeof(struct page), > + PAGES_PER_SECTION), GFP_KERNEL); FWIW, this is what I meant: return kvmalloc(array_size(sizeof(struct page), PAGES_PER_SECTION), GFP_KERNEL); -- Thanks, David / dhildenb
