[PATCH v2 2/2] dma-buf: heaps: Clear CMA highages using helper

[Linus Walleij <linusw@kernel.org>]

Currently the CMA allocator clears highmem pages using
kmap()->clear_page()->kunmap(), but there is a helper
static inline in <linux/highmem.h> that does the same for
us so use clear_highpage() instead of open coding this.

Suggested-by: T.J. Mercier <tjmercier@google.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>
---
 drivers/dma-buf/heaps/cma_heap.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c
index f0bacf25ed9d..92865786cfc9 100644
--- a/drivers/dma-buf/heaps/cma_heap.c
+++ b/drivers/dma-buf/heaps/cma_heap.c
@@ -329,10 +329,7 @@ static struct dma_buf *cma_heap_allocate(struct dma_heap *heap,
 		struct page *page = cma_pages;
 
 		while (nr_clear_pages > 0) {
-			void *vaddr = kmap_local_page(page);
-
-			clear_page(vaddr);
-			kunmap_local(vaddr);
+			clear_highpage(page);
 			/*
 			 * Avoid wasting time zeroing memory if the process
 			 * has been killed by SIGKILL.

-- 
2.53.0