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 9/8WxJBe 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 3/30/23 6:40 AM, Peng Zhang wrote: > From: ZhangPeng > > Call vma_alloc_folio() directly instead of alloc_page_vma(). Add an > assertion that this is a single-page folio and removes several calls to > compound_head(). > > Signed-off-by: ZhangPeng > --- > mm/userfaultfd.c | 25 +++++++++++++------------ > 1 file changed, 13 insertions(+), 12 deletions(-) > > diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c > index 7f1b5f8b712c..efa9e1d681ee 100644 > --- a/mm/userfaultfd.c > +++ b/mm/userfaultfd.c > @@ -137,15 +137,15 @@ static int mfill_atomic_pte_copy(pmd_t *dst_pmd, > { > void *page_kaddr; > int ret; > - struct page *page; > + struct folio *folio; > > if (!*pagep) { > ret = -ENOMEM; > - page = alloc_page_vma(GFP_HIGHUSER_MOVABLE, dst_vma, dst_addr); > - if (!page) > + folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, dst_vma, dst_addr, false); > + if (!folio) > goto out; > > - page_kaddr = kmap_local_page(page); > + page_kaddr = kmap_local_folio(folio, 0); Should this variable name be kept as page_kaddr or should it be changed to something like folio_kaddr? kmap_local_folio() returns page_address(), so maybe page_kaddr is better. > /* > * The read mmap_lock is held here. Despite the > * mmap_lock being read recursive a deadlock is still > @@ -171,36 +171,37 @@ static int mfill_atomic_pte_copy(pmd_t *dst_pmd, > /* fallback to copy_from_user outside mmap_lock */ > if (unlikely(ret)) { > ret = -ENOENT; > - *pagep = page; > + *pagep = &folio->page; > /* don't free the page */ > goto out; > } > > - flush_dcache_page(page); > + flush_dcache_folio(folio); > } else { > - page = *pagep; > + folio = page_folio(*pagep); > + VM_BUG_ON_FOLIO(folio_test_large(folio), folio); > *pagep = NULL; > } > > /* > - * The memory barrier inside __SetPageUptodate makes sure that > + * The memory barrier inside __folio_mark_uptodate makes sure that > * preceding stores to the page contents become visible before > * the set_pte_at() write. > */ > - __SetPageUptodate(page); > + __folio_mark_uptodate(folio); > > ret = -ENOMEM; > - if (mem_cgroup_charge(page_folio(page), dst_vma->vm_mm, GFP_KERNEL)) > + if (mem_cgroup_charge(folio, dst_vma->vm_mm, GFP_KERNEL)) > goto out_release; > > ret = mfill_atomic_install_pte(dst_pmd, dst_vma, dst_addr, > - page, true, flags); > + &folio->page, true, flags); > if (ret) > goto out_release; > out: > return ret; > out_release: > - put_page(page); > + folio_put(folio); > goto out; > } Thanks, Reviewed-by: Sidhartha Kumar >