linux-kernel - [PATCH] mm: remove redundant clear page when CONFIG_INIT_ON_ALLOC_DEFAULT

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Date:   Mon, 11 Sep 2023 18:49:06 +0800
From:   "zhaoyang.huang" <zhaoyang.huang@...soc.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        Zhaoyang Huang <huangzhaoyang@...il.com>, <ke.wang@...soc.com>
Subject: [PATCH] mm: remove redundant clear page when CONFIG_INIT_ON_ALLOC_DEFAULT_ON configured

From: Zhaoyang Huang <zhaoyang.huang@...soc.com>

There will be redundant clear page within vma_alloc_zeroed_movable_folio
when CONFIG_INIT_ON_ALLOC_DEFAULT_ON is on. Remove it by judging related
configs.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...soc.com>
---
 include/linux/highmem.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 99c474de800d..3926f8414729 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -227,7 +227,7 @@ struct folio *vma_alloc_zeroed_movable_folio(struct vm_area_struct *vma,
 	struct folio *folio;
 
 	folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, vma, vaddr, false);
-	if (folio)
+	if (folio && !want_init_on_alloc(GFP_HIGHUSER_MOVABLE))
 		clear_user_highpage(&folio->page, vaddr);
 
 	return folio;
-- 
2.25.1