linux-kernel - [PATCH 6/6] mm: memory: use folio_prealloc() in do_anonymous

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Message-ID: <20231107135216.415926-7-wangkefeng.wang@huawei.com>
Date:   Tue, 7 Nov 2023 21:52:16 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 6/6] mm: memory: use folio_prealloc() in do_anonymous_page()

Use folio_prealloc() to simplify code a bit.

Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 mm/memory.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 1a7dc19bd35d..e4deab750a51 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4167,14 +4167,10 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
 
 	/* Allocate our own private page. */
 	if (unlikely(anon_vma_prepare(vma)))
-		goto oom;
-	folio = vma_alloc_zeroed_movable_folio(vma, vmf->address);
+		return VM_FAULT_OOM;
+	folio = folio_prealloc(vma->vm_mm, vma, vmf->address, true);
 	if (!folio)
-		goto oom;
-
-	if (mem_cgroup_charge(folio, vma->vm_mm, GFP_KERNEL))
-		goto oom_free_page;
-	folio_throttle_swaprate(folio, GFP_KERNEL);
+		return VM_FAULT_OOM;
 
 	/*
 	 * The memory barrier inside __folio_mark_uptodate makes sure that
@@ -4225,10 +4221,6 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
 release:
 	folio_put(folio);
 	goto unlock;
-oom_free_page:
-	folio_put(folio);
-oom:
-	return VM_FAULT_OOM;
 }
 
 /*
-- 
2.27.0