linux-kernel - [PATCH 06/10] mm/hugetlb: remove redundant huge_pte_alloc() in hugetlb

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Date:   Fri,  7 Aug 2020 17:12:47 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     mike.kravetz@...cle.com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: [PATCH 06/10] mm/hugetlb: remove redundant huge_pte_alloc() in hugetlb_fault()

Before proper processing, huge_pte_alloc() would be called
un-conditionally. It is not necessary to do this when ptep is NULL.

Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
---
 mm/hugetlb.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f5f04e89000d..fb09e5a83c39 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4534,10 +4534,6 @@ vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 		} else if (unlikely(is_hugetlb_entry_hwpoisoned(entry)))
 			return VM_FAULT_HWPOISON_LARGE |
 				VM_FAULT_SET_HINDEX(hstate_index(h));
-	} else {
-		ptep = huge_pte_alloc(mm, haddr, huge_page_size(h));
-		if (!ptep)
-			return VM_FAULT_OOM;
 	}
 
 	/*
-- 
2.20.1 (Apple Git-117)