linux-kernel - [PATCH v2 32/61] drivers/tee/optee: Use maple tree iterators for __check_mem

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Message-ID: <20210817154651.1570984-33-Liam.Howlett@oracle.com>
Date:   Tue, 17 Aug 2021 15:47:22 +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 v2 32/61] drivers/tee/optee: Use maple tree iterators for
 __check_mem_type()

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 drivers/tee/optee/call.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index 945f03da0223..071ff5d9c059 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -582,11 +582,18 @@ static bool is_normal_memory(pgprot_t p)
 
 static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
 {
-	while (vma && is_normal_memory(vma->vm_page_prot)) {
-		if (vma->vm_end >= end)
-			return 0;
-		vma = vma->vm_next;
+	MA_STATE(mas, &vma->vm_mm->mm_mt, vma->vm_start, vma->vm_start);
+
+
+	rcu_read_lock();
+	mas_for_each(&mas, vma, end) {
+		if (!is_normal_memory(vma->vm_page_prot))
+		    break;
 	}
+	rcu_read_unlock();
+
+	if (!vma)
+		return 0;
 
 	return -EINVAL;
 }
-- 
2.30.2