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From:   Liam Howlett <liam.howlett@oracle.com>
To:     "maple-tree@lists.infradead.org" <maple-tree@lists.infradead.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
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CC:     Song Liu <songliubraving@fb.com>,
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        "Paul E . McKenney" <paulmck@kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
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        Rik van Riel <riel@surriel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Michel Lespinasse <walken.cr@gmail.com>,
        Liam Howlett <liam.howlett@oracle.com>
Subject: [PATCH 56/94] arch/powerpc: Remove mmap linked list from
 mm/book3s64/subpage_prot
Thread-Topic: [PATCH 56/94] arch/powerpc: Remove mmap linked list from
 mm/book3s64/subpage_prot
Thread-Index: AQHXPEQ6df2igs9S70CVUGfBaKBTxA==
Date:   Wed, 28 Apr 2021 15:36:16 +0000
Message-ID: <20210428153542.2814175-57-Liam.Howlett@Oracle.com>
References: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
In-Reply-To: <20210428153542.2814175-1-Liam.Howlett@Oracle.com>
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Start using the maple tree

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 arch/powerpc/mm/book3s64/subpage_prot.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/subpage_prot.c b/arch/powerpc/mm/book=
3s64/subpage_prot.c
index 60c6ea16a972..51722199408e 100644
--- a/arch/powerpc/mm/book3s64/subpage_prot.c
+++ b/arch/powerpc/mm/book3s64/subpage_prot.c
@@ -149,25 +149,18 @@ static void subpage_mark_vma_nohuge(struct mm_struct =
*mm, unsigned long addr,
 				    unsigned long len)
 {
 	struct vm_area_struct *vma;
+	MA_STATE(mas, &mm->mm_mt, addr, addr);
=20
 	/*
 	 * We don't try too hard, we just mark all the vma in that range
 	 * VM_NOHUGEPAGE and split them.
 	 */
-	vma =3D find_vma(mm, addr);
-	/*
-	 * If the range is in unmapped range, just return
-	 */
-	if (vma && ((addr + len) <=3D vma->vm_start))
-		return;
-
-	while (vma) {
-		if (vma->vm_start >=3D (addr + len))
-			break;
+	rcu_read_lock();
+	mas_for_each(&mas, vma, addr + len) {
 		vma->vm_flags |=3D VM_NOHUGEPAGE;
 		walk_page_vma(vma, &subpage_walk_ops, NULL);
-		vma =3D vma->vm_next;
 	}
+	rcu_read_unlock();
 }
 #else
 static void subpage_mark_vma_nohuge(struct mm_struct *mm, unsigned long ad=
dr,
--=20
2.30.2