linux-kernel - [PATCH] arm64/mm: Remove add_huge_page

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Date:   Wed,  6 May 2020 16:46:35 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, mark.rutland@....com,
        will@...nel.org, catalin.marinas@....com, shan.gavin@...il.com
Subject: [PATCH] arm64/mm: Remove add_huge_page_size()

The function add_huge_page_size(), wrapper of hugetlb_add_hstate(),
avoids to register duplicated huge page states for same size. However,
the same logic has been included in hugetlb_add_hstate(). So it seems
unnecessary to keep add_huge_page_size() and this just removes it.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/mm/hugetlbpage.c | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index bbeb6a5a6ba6..ed7530413941 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -441,22 +441,14 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma,
 	clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
 }
 
-static void __init add_huge_page_size(unsigned long size)
-{
-	if (size_to_hstate(size))
-		return;
-
-	hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT);
-}
-
 static int __init hugetlbpage_init(void)
 {
 #ifdef CONFIG_ARM64_4K_PAGES
-	add_huge_page_size(PUD_SIZE);
+	hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
 #endif
-	add_huge_page_size(CONT_PMD_SIZE);
-	add_huge_page_size(PMD_SIZE);
-	add_huge_page_size(CONT_PTE_SIZE);
+	hugetlb_add_hstate(CONT_PMD_SHIFT + PMD_SHIFT - PAGE_SHIFT);
+	hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
+	hugetlb_add_hstate(CONT_PTE_SHIFT);
 
 	return 0;
 }
@@ -473,7 +465,7 @@ static __init int setup_hugepagesz(char *opt)
 	case CONT_PMD_SIZE:
 	case PMD_SIZE:
 	case CONT_PTE_SIZE:
-		add_huge_page_size(ps);
+		hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT);
 		return 1;
 	}
 
-- 
2.23.0