linux-kernel - [PATCH 60/94] drivers/misc/cxl: Use maple tree iterators for cxl_prefault

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Date:   Wed, 28 Apr 2021 15:36:18 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH 60/94] drivers/misc/cxl: Use maple tree iterators for
 cxl_prefault_vma()

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.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);
 
 	mm = get_mem_context(ctx);
 	if (mm == NULL) {
@@ -321,8 +322,10 @@ static void cxl_prefault_vma(struct cxl_context *ctx)
 		return;
 	}
 
+	mas.tree = &mm->mm_mt;
 	mmap_read_lock(mm);
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
+	rcu_read_lock();
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		for (ea = vma->vm_start; ea < vma->vm_end;
 				ea = next_segment(ea, slb.vsid)) {
 			rc = copro_calculate_slb(mm, ea, &slb);
@@ -336,6 +339,7 @@ static void cxl_prefault_vma(struct cxl_context *ctx)
 			last_esid = slb.esid;
 		}
 	}
+	rcu_read_unlock();
 	mmap_read_unlock(mm);
 
 	mmput(mm);
-- 
2.30.2