linux-kernel - [PATCH 5.10 563/593] mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX

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Date:   Mon, 12 Jul 2021 08:12:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaohe Lin <linmiaohe@...wei.com>,
        Yang Shi <shy828301@...il.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Song Liu <songliubraving@...com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Rik van Riel <riel@...riel.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 563/593] mm/huge_memory.c: remove dedicated macro HPAGE_CACHE_INDEX_MASK

From: Miaohe Lin <linmiaohe@...wei.com>

[ Upstream commit b2bd53f18bb7f7cfc91b3bb527d7809376700a8e ]

Patch series "Cleanup and fixup for huge_memory:, v3.

This series contains cleanups to remove dedicated macro and remove
unnecessary tlb_remove_page_size() for huge zero pmd.  Also this adds
missing read-only THP checking for transparent_hugepage_enabled() and
avoids discarding hugepage if other processes are mapping it.  More
details can be found in the respective changelogs.

Thi patch (of 5):

Rewrite the pgoff checking logic to remove macro HPAGE_CACHE_INDEX_MASK
which is only used here to simplify the code.

Link: https://lkml.kernel.org/r/20210511134857.1581273-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20210511134857.1581273-2-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Yang Shi <shy828301@...il.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
Reviewed-by: David Hildenbrand <david@...hat.com>
Cc: Zi Yan <ziy@...dia.com>
Cc: William Kucharski <william.kucharski@...cle.com>
Cc: Matthew Wilcox <willy@...radead.org>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>
Cc: Ralph Campbell <rcampbell@...dia.com>
Cc: Song Liu <songliubraving@...com>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Rik van Riel <riel@...riel.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Alexey Dobriyan <adobriyan@...il.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/linux/huge_mm.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 10c7a80a0394..bf37fbdaa59d 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -161,15 +161,13 @@ static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma)
 
 bool transparent_hugepage_enabled(struct vm_area_struct *vma);
 
-#define HPAGE_CACHE_INDEX_MASK (HPAGE_PMD_NR - 1)
-
 static inline bool transhuge_vma_suitable(struct vm_area_struct *vma,
 		unsigned long haddr)
 {
 	/* Don't have to check pgoff for anonymous vma */
 	if (!vma_is_anonymous(vma)) {
-		if (((vma->vm_start >> PAGE_SHIFT) & HPAGE_CACHE_INDEX_MASK) !=
-			(vma->vm_pgoff & HPAGE_CACHE_INDEX_MASK))
+		if (!IS_ALIGNED((vma->vm_start >> PAGE_SHIFT) - vma->vm_pgoff,
+				HPAGE_PMD_NR))
 			return false;
 	}
 
-- 
2.30.2