linux-kernel - [PATCH 1/4] mm/memory: convert do_page

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Message-ID: <20230703055850.227169-1-sidhartha.kumar@oracle.com>
Date:   Sun,  2 Jul 2023 22:58:47 -0700
From:   Sidhartha Kumar <sidhartha.kumar@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     akpm@...ux-foundation.org, willy@...radead.org,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH 1/4] mm/memory: convert do_page_mkwrite() to use folios

Saves one implicit call to compound_head();

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
---
 mm/memory.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 21fab27272092..098fac2f5efc0 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2932,7 +2932,7 @@ static gfp_t __get_fault_gfp_mask(struct vm_area_struct *vma)
 static vm_fault_t do_page_mkwrite(struct vm_fault *vmf)
 {
 	vm_fault_t ret;
-	struct page *page = vmf->page;
+	struct folio *folio = page_folio(vmf->page);
 	unsigned int old_flags = vmf->flags;
 
 	vmf->flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
@@ -2947,14 +2947,14 @@ static vm_fault_t do_page_mkwrite(struct vm_fault *vmf)
 	if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE)))
 		return ret;
 	if (unlikely(!(ret & VM_FAULT_LOCKED))) {
-		lock_page(page);
-		if (!page->mapping) {
-			unlock_page(page);
+		folio_lock(folio);
+		if (!folio_mapping(folio)) {
+			folio_unlock(folio);
 			return 0; /* retry */
 		}
 		ret |= VM_FAULT_LOCKED;
 	} else
-		VM_BUG_ON_PAGE(!PageLocked(page), page);
+		VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
 	return ret;
 }
 
-- 
2.41.0