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From:   Kefeng Wang <wangkefeng.wang@huawei.com>
To:     <akpm@linux-foundation.org>, <willy@infradead.org>,
        <linux-mm@kvack.org>
CC:     <linux-kernel@vger.kernel.org>,
        Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: [PATCH -next 1/7] mm: huge_memory: make __do_huge_pmd_anonymous_page() to take a folio
Date:   Thu, 12 Jan 2023 16:30:00 +0800
Message-ID: <20230112083006.163393-2-wangkefeng.wang@huawei.com>
In-Reply-To: <20230112083006.163393-1-wangkefeng.wang@huawei.com>
References: <20230112083006.163393-1-wangkefeng.wang@huawei.com>
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Let's __do_huge_pmd_anonymous_page() take a folio and convert related
functions to use folios.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
---
 mm/huge_memory.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index c13b1f67d14e..cb23b24e2eb8 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -650,22 +650,23 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
 EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
 
 static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
-			struct page *page, gfp_t gfp)
+			struct folio *folio, gfp_t gfp)
 {
 	struct vm_area_struct *vma = vmf->vma;
+	struct page *page = &folio->page;
 	pgtable_t pgtable;
 	unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
 	vm_fault_t ret = 0;
 
-	VM_BUG_ON_PAGE(!PageCompound(page), page);
+	VM_BUG_ON_FOLIO(!folio_test_large(folio), folio);
 
-	if (mem_cgroup_charge(page_folio(page), vma->vm_mm, gfp)) {
-		put_page(page);
+	if (mem_cgroup_charge(folio, vma->vm_mm, gfp)) {
+		folio_put(folio);
 		count_vm_event(THP_FAULT_FALLBACK);
 		count_vm_event(THP_FAULT_FALLBACK_CHARGE);
 		return VM_FAULT_FALLBACK;
 	}
-	cgroup_throttle_swaprate(page, gfp);
+	folio_throttle_swaprate(folio, gfp);
 
 	pgtable = pte_alloc_one(vma->vm_mm);
 	if (unlikely(!pgtable)) {
@@ -675,11 +676,11 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
 
 	clear_huge_page(page, vmf->address, HPAGE_PMD_NR);
 	/*
-	 * The memory barrier inside __SetPageUptodate makes sure that
+	 * The memory barrier inside __folio_mark_uptodate makes sure that
 	 * clear_huge_page writes become visible before the set_pmd_at()
 	 * write.
 	 */
-	__SetPageUptodate(page);
+	__folio_mark_uptodate(folio);
 
 	vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
 	if (unlikely(!pmd_none(*vmf->pmd))) {
@@ -694,7 +695,7 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
 		/* Deliver the page fault to userland */
 		if (userfaultfd_missing(vma)) {
 			spin_unlock(vmf->ptl);
-			put_page(page);
+			folio_put(folio);
 			pte_free(vma->vm_mm, pgtable);
 			ret = handle_userfault(vmf, VM_UFFD_MISSING);
 			VM_BUG_ON(ret & VM_FAULT_FALLBACK);
@@ -704,7 +705,7 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
 		entry = mk_huge_pmd(page, vma->vm_page_prot);
 		entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
 		page_add_new_anon_rmap(page, vma, haddr);
-		lru_cache_add_inactive_or_unevictable(page, vma);
+		folio_add_lru_vma(folio, vma);
 		pgtable_trans_huge_deposit(vma->vm_mm, vmf->pmd, pgtable);
 		set_pmd_at(vma->vm_mm, haddr, vmf->pmd, entry);
 		update_mmu_cache_pmd(vma, vmf->address, vmf->pmd);
@@ -721,7 +722,7 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
 release:
 	if (pgtable)
 		pte_free(vma->vm_mm, pgtable);
-	put_page(page);
+	folio_put(folio);
 	return ret;
 
 }
@@ -834,7 +835,7 @@ vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf)
 		count_vm_event(THP_FAULT_FALLBACK);
 		return VM_FAULT_FALLBACK;
 	}
-	return __do_huge_pmd_anonymous_page(vmf, &folio->page, gfp);
+	return __do_huge_pmd_anonymous_page(vmf, folio, gfp);
 }
 
 static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
-- 
2.35.3