From cc09cb134124a42fbe3bdcebefdc54e286d8f3e5 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Tue, 15 Dec 2020 22:55:54 -0500 Subject: mm/page_alloc: Add folio allocation functions The __folio_alloc(), __folio_alloc_node() and folio_alloc() functions are mostly for type safety, but they also ensure that the page allocator allocates a compound page and initialises the deferred list if the page is large enough to have one. Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Acked-by: Vlastimil Babka --- mm/mempolicy.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'mm/mempolicy.c') diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 1592b081c58e..251df91ddc80 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2202,6 +2202,16 @@ struct page *alloc_pages(gfp_t gfp, unsigned order) } EXPORT_SYMBOL(alloc_pages); +struct folio *folio_alloc(gfp_t gfp, unsigned order) +{ + struct page *page = alloc_pages(gfp | __GFP_COMP, order); + + if (page && order > 1) + prep_transhuge_page(page); + return (struct folio *)page; +} +EXPORT_SYMBOL(folio_alloc); + int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) { struct mempolicy *pol = mpol_dup(vma_policy(src)); -- cgit v1.2.3-70-g09d2