[PATCH v12 38/69] optee: remove vma linked list walk

Liam Howlett
2022-07-20T02:22:35Z

From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

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.

Link: https://lkml.kernel.org/r/20220504011345.662299-23-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-39-Liam.Howlett@oracle.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
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 28f87cd8b3ed..290b1bb0e9cd 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -492,15 +492,18 @@ 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)
@@ -516,8 +519,7 @@ 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;
--
2.35.1