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Fri, 31 Mar 2023 17:41:51 +0800 From: Peng Zhang To: , , , , , CC: , , , , ZhangPeng Subject: [PATCH v5 4/6] userfaultfd: convert mfill_atomic_hugetlb() to use a folio Date: Fri, 31 Mar 2023 17:39:35 +0800 Message-ID: <20230331093937.945725-5-zhangpeng362@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230331093937.945725-1-zhangpeng362@huawei.com> References: <20230331093937.945725-1-zhangpeng362@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To kwepemm600020.china.huawei.com (7.193.23.147) X-CFilter-Loop: Reflected X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 3D58AA0006 X-Stat-Signature: qwec5jakqquc463fwfpobxoiefqkosk3 X-Rspam-User: X-HE-Tag: 1680255714-231813 X-HE-Meta: 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 g5ndDGgs pzMqkWU3WvnPRw+i7oEsiGfBfgDalEuRqsL0yiTSwcJRtK12SH4yJsYKtsNapmTnJB2Z4nFIlvcE52zxeTr0j75bgoblJcAVxP+MsI/cvrboUS2oCN0LPV9m76u5qWjabfcInbCOmit3SWBC84zVelaPO8iHv9w81sKwxUau913/uuKFJdyUb7yjq4fq6ARQZeJCBewWvr70tpz6cs0ZxKnT2iaKP3Vv8MlMUosNsGjjuV7l417VTqIufjZiNJaw8/6zR6sDL5sSstLx8276L4772SvxbPHP+btXgCV6UaOGbx+w63XpwzKZYKA== 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: From: ZhangPeng Convert hugetlb_mfill_atomic_pte() to take in a folio pointer instead of a page pointer. Convert mfill_atomic_hugetlb() to use a folio. Signed-off-by: ZhangPeng Reviewed-by: Sidhartha Kumar Reviewed-by: Mike Kravetz --- include/linux/hugetlb.h | 4 ++-- mm/hugetlb.c | 26 +++++++++++++------------- mm/userfaultfd.c | 16 ++++++++-------- 3 files changed, 23 insertions(+), 23 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 2a758bcd6719..28703fe22386 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -163,7 +163,7 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte, unsigned long dst_addr, unsigned long src_addr, uffd_flags_t flags, - struct page **pagep); + struct folio **foliop); #endif /* CONFIG_USERFAULTFD */ bool hugetlb_reserve_pages(struct inode *inode, long from, long to, struct vm_area_struct *vma, @@ -397,7 +397,7 @@ static inline int hugetlb_mfill_atomic_pte(pte_t *dst_pte, unsigned long dst_addr, unsigned long src_addr, uffd_flags_t flags, - struct page **pagep) + struct folio **foliop) { BUG(); return 0; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index aade1b513474..c88f856ec2e2 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -6178,7 +6178,7 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte, unsigned long dst_addr, unsigned long src_addr, uffd_flags_t flags, - struct page **pagep) + struct folio **foliop) { struct mm_struct *dst_mm = dst_vma->vm_mm; bool is_continue = uffd_flags_mode_is(flags, MFILL_ATOMIC_CONTINUE); @@ -6201,8 +6201,8 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte, if (IS_ERR(folio)) goto out; folio_in_pagecache = true; - } else if (!*pagep) { - /* If a page already exists, then it's UFFDIO_COPY for + } else if (!*foliop) { + /* If a folio already exists, then it's UFFDIO_COPY for * a non-missing case. Return -EEXIST. */ if (vm_shared && @@ -6237,33 +6237,33 @@ int hugetlb_mfill_atomic_pte(pte_t *dst_pte, ret = -ENOMEM; goto out; } - *pagep = &folio->page; - /* Set the outparam pagep and return to the caller to + *foliop = folio; + /* Set the outparam foliop and return to the caller to * copy the contents outside the lock. Don't free the - * page. + * folio. */ goto out; } } else { if (vm_shared && hugetlbfs_pagecache_present(h, dst_vma, dst_addr)) { - put_page(*pagep); + folio_put(*foliop); ret = -EEXIST; - *pagep = NULL; + *foliop = NULL; goto out; } folio = alloc_hugetlb_folio(dst_vma, dst_addr, 0); if (IS_ERR(folio)) { - put_page(*pagep); + folio_put(*foliop); ret = -ENOMEM; - *pagep = NULL; + *foliop = NULL; goto out; } - copy_user_huge_page(&folio->page, *pagep, dst_addr, dst_vma, + copy_user_huge_page(&folio->page, &(*foliop)->page, dst_addr, dst_vma, pages_per_huge_page(h)); - put_page(*pagep); - *pagep = NULL; + folio_put(*foliop); + *foliop = NULL; } /* diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 78fed9003cf7..f9ebaa079a6a 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -322,7 +322,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb( pte_t *dst_pte; unsigned long src_addr, dst_addr; long copied; - struct page *page; + struct folio *folio; unsigned long vma_hpagesize; pgoff_t idx; u32 hash; @@ -342,7 +342,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb( src_addr = src_start; dst_addr = dst_start; copied = 0; - page = NULL; + folio = NULL; vma_hpagesize = vma_kernel_pagesize(dst_vma); /* @@ -411,7 +411,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb( } err = hugetlb_mfill_atomic_pte(dst_pte, dst_vma, dst_addr, - src_addr, flags, &page); + src_addr, flags, &folio); hugetlb_vma_unlock_read(dst_vma); mutex_unlock(&hugetlb_fault_mutex_table[hash]); @@ -420,9 +420,9 @@ static __always_inline ssize_t mfill_atomic_hugetlb( if (unlikely(err == -ENOENT)) { mmap_read_unlock(dst_mm); - BUG_ON(!page); + BUG_ON(!folio); - err = copy_folio_from_user(page_folio(page), + err = copy_folio_from_user(folio, (const void __user *)src_addr, true); if (unlikely(err)) { err = -EFAULT; @@ -433,7 +433,7 @@ static __always_inline ssize_t mfill_atomic_hugetlb( dst_vma = NULL; goto retry; } else - BUG_ON(page); + BUG_ON(folio); if (!err) { dst_addr += vma_hpagesize; @@ -450,8 +450,8 @@ static __always_inline ssize_t mfill_atomic_hugetlb( out_unlock: mmap_read_unlock(dst_mm); out: - if (page) - put_page(page); + if (folio) + folio_put(folio); BUG_ON(copied < 0); BUG_ON(err > 0); BUG_ON(!copied && !err);