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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>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
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CC:     Song Liu <songliubraving@fb.com>,
        Davidlohr Bueso <dave@stgolabs.net>,
        "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 60/94] drivers/misc/cxl: Use maple tree iterators for
 cxl_prefault_vma()
Thread-Topic: [PATCH 60/94] drivers/misc/cxl: Use maple tree iterators for
 cxl_prefault_vma()
Thread-Index: AQHXPEQ7f7mwLlwXLk6SPq2C7tnu0A==
Date:   Wed, 28 Apr 2021 15:36:18 +0000
Message-ID: <20210428153542.2814175-61-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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Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 drivers/misc/cxl/fault.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index 60c829113299..60a33b953ef4 100644
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -313,6 +313,7 @@ static void cxl_prefault_vma(struct cxl_context *ctx)
 	struct vm_area_struct *vma;
 	int rc;
 	struct mm_struct *mm;
+	MA_STATE(mas, NULL, 0, 0);
=20
 	mm =3D get_mem_context(ctx);
 	if (mm =3D=3D NULL) {
@@ -321,8 +322,10 @@ static void cxl_prefault_vma(struct cxl_context *ctx)
 		return;
 	}
=20
+	mas.tree =3D &mm->mm_mt;
 	mmap_read_lock(mm);
-	for (vma =3D mm->mmap; vma; vma =3D vma->vm_next) {
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		for (ea =3D vma->vm_start; ea < vma->vm_end;
 				ea =3D next_segment(ea, slb.vsid)) {
 			rc =3D copro_calculate_slb(mm, ea, &slb);
@@ -336,6 +339,7 @@ static void cxl_prefault_vma(struct cxl_context *ctx)
 			last_esid =3D slb.esid;
 		}
 	}
+	rcu_read_unlock();
 	mmap_read_unlock(mm);
=20
 	mmput(mm);
--=20
2.30.2