[RFC PATCH 32/37] copy_page_to_iter(): don't bother with kmap_atomic() for bvec/kvec cases

[Al Viro]

kmap_local_page() is enough there.  Moreover, we can use _copy_to_iter()
for actual copying in those cases - no useful extra checks on the
address we are copying from in that call.

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
 lib/iov_iter.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 9ecbf59c3378..4fcd0cc44e47 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -832,9 +832,9 @@ static size_t __copy_page_to_iter(struct page *page, size_t offset, size_t bytes
 	if (likely(iter_is_iovec(i)))
 		return copy_page_to_iter_iovec(page, offset, bytes, i);
 	if (iov_iter_is_bvec(i) || iov_iter_is_kvec(i) || iov_iter_is_xarray(i)) {
-		void *kaddr = kmap_atomic(page);
-		size_t wanted = copy_to_iter(kaddr + offset, bytes, i);
-		kunmap_atomic(kaddr);
+		void *kaddr = kmap_local_page(page);
+		size_t wanted = _copy_to_iter(kaddr + offset, bytes, i);
+		kunmap_local(kaddr);
 		return wanted;
 	}
 	if (iov_iter_is_pipe(i))
-- 
2.11.0