linux-kernel - [PATCH v7 39/70] optee: Remove vma linked list walk

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Date:   Mon, 4 Apr 2022 14:35:48 +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>
Subject: [PATCH v7 39/70] optee: Remove vma linked list walk

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

Use the VMA iterator instead.  Change the calling convention of
__check_mem_type() to pass in the mm instead of the first vma in the
range.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
---
 drivers/tee/optee/call.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index bd49ec934060..d8115dcae6e7 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -342,15 +342,18 @@ static bool is_normal_memory(pgprot_t p)
 #endif
 }
 
-static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
+static int __check_mem_type(struct mm_struct *mm, unsigned long start,
+				unsigned long end)
 {
-	while (vma && is_normal_memory(vma->vm_page_prot)) {
-		if (vma->vm_end >= end)
-			return 0;
-		vma = vma->vm_next;
+	struct vm_area_struct *vma;
+	VMA_ITERATOR(vmi, mm, start);
+
+	for_each_vma_range(vmi, vma, end) {
+		if (!is_normal_memory(vma->vm_page_prot))
+			return -EINVAL;
 	}
 
-	return -EINVAL;
+	return 0;
 }
 
 int optee_check_mem_type(unsigned long start, size_t num_pages)
@@ -366,8 +369,7 @@ int optee_check_mem_type(unsigned long start, size_t num_pages)
 		return 0;
 
 	mmap_read_lock(mm);
-	rc = __check_mem_type(find_vma(mm, start),
-			      start + num_pages * PAGE_SIZE);
+	rc = __check_mem_type(mm, start, start + num_pages * PAGE_SIZE);
 	mmap_read_unlock(mm);
 
 	return rc;
-- 
2.34.1