linux-kernel - [PATCH v3 4/4] mm/memory: convert do_read

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Date:   Thu,  6 Jul 2023 09:38:47 -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,
        zhangpeng362@...wei.com,
        Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH v3 4/4] mm/memory: convert do_read_fault() to use folios

Saves one implicit call to compound_head()

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
v3:
	- move folio initialization after finish_fault()
v2
	 - move folio initialization after __do_fault()
 mm/memory.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index a59b10e534c07..64e1eb840dec7 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4541,6 +4541,7 @@ static inline bool should_fault_around(struct vm_fault *vmf)
 static vm_fault_t do_read_fault(struct vm_fault *vmf)
 {
 	vm_fault_t ret = 0;
+	struct folio *folio;
 
 	/*
 	 * Let's call ->map_pages() first and use ->fault() as fallback
@@ -4558,9 +4559,10 @@ static vm_fault_t do_read_fault(struct vm_fault *vmf)
 		return ret;
 
 	ret |= finish_fault(vmf);
-	unlock_page(vmf->page);
+	folio = page_folio(vmf->page);
+	folio_unlock(folio);
 	if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
-		put_page(vmf->page);
+		folio_put(folio);
 	return ret;
 }
 
-- 
2.41.0