pipe_zero(): we don't need no stinkin' kmap_atomic()...
FWIW, memcpy_to_page() itself almost certainly ought to
use kmap_local_page()...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 3b442d2..a827991 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -897,7 +897,9 @@ 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;
