From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 30 Apr 2021 22:39:25 +0000 (-0400)
Subject: pipe_zero(): we don't need no stinkin' kmap_atomic()...
X-Git-Tag: accepted/tizen/unified/20230118.172025~6913^2~2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=893839fd57330ce226d4ee1b16fd5221a27fb6ec;p=platform%2Fkernel%2Flinux-rpi.git

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;