[RFC PATCH 35/37] pipe_zero(): we don't need no stinkin' kmap_atomic()...

[Al Viro]

	FWIW, memcpy_to_page() itself almost certainly ought to
use kmap_local_page()...

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
 lib/iov_iter.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 56d2606a47e4..7471fb181643 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -908,7 +908,9 @@ static size_t pipe_zero(size_t bytes, struct iov_iter *i)
 
 	do {
 		size_t chunk = min_t(size_t, n, PAGE_SIZE - off);
-		memzero_page(pipe->bufs[i_head & p_mask].page, off, chunk);
+		char *p = kmap_local_page(pipe->bufs[i_head & p_mask].page);
+		memset(p + off, 0, chunk);
+		kunmap_local(p);
 		i->head = i_head;
 		i->iov_offset = off + chunk;
 		n -= chunk;
-- 
2.11.0