From: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Date: Thu, 6 Jul 2023 16:38:46 +0000 (-0700)
Subject: mm/memory: convert do_shared_fault() to folios
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=6f609b7e37dff1e8b2261e93da8e2e9848d5513c;p=linux.git

mm/memory: convert do_shared_fault() to folios

Saves three implicit calls to compound_head().

Link: https://lkml.kernel.org/r/20230706163847.403202-3-sidhartha.kumar@oracle.com
Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: ZhangPeng <zhangpeng362@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/memory.c b/mm/memory.c
index a88e57d927bd..7bebd6909199 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4602,21 +4602,24 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	vm_fault_t ret, tmp;
+	struct folio *folio;
 
 	ret = __do_fault(vmf);
 	if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
 		return ret;
 
+	folio = page_folio(vmf->page);
+
 	/*
 	 * Check if the backing address space wants to know that the page is
 	 * about to become writable
 	 */
 	if (vma->vm_ops->page_mkwrite) {
-		unlock_page(vmf->page);
+		folio_unlock(folio);
 		tmp = do_page_mkwrite(vmf);
 		if (unlikely(!tmp ||
 				(tmp & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))) {
-			put_page(vmf->page);
+			folio_put(folio);
 			return tmp;
 		}
 	}
@@ -4624,8 +4627,8 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
 	ret |= finish_fault(vmf);
 	if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE |
 					VM_FAULT_RETRY))) {
-		unlock_page(vmf->page);
-		put_page(vmf->page);
+		folio_unlock(folio);
+		folio_put(folio);
 		return ret;
 	}