linux-kernel - [PATCH 07/10] block: Add missing flush_dcache

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Date:   Tue,  8 May 2018 21:33:55 -0400
From:   Kent Overstreet <kent.overstreet@...il.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-mm@...ck.org, Jens Axboe <axboe@...nel.dk>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Kent Overstreet <kent.overstreet@...il.com>
Subject: [PATCH 07/10] block: Add missing flush_dcache_page() call

Since a bio can point to userspace pages (e.g. direct IO), this is
generally necessary.

Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
---
 block/bio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/bio.c b/block/bio.c
index c58544d4bc..ce8e259f9a 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -994,6 +994,8 @@ void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter,
 		kunmap_atomic(dst_p);
 		kunmap_atomic(src_p);
 
+		flush_dcache_page(dst_bv.bv_page);
+
 		bio_advance_iter(src, src_iter, bytes);
 		bio_advance_iter(dst, dst_iter, bytes);
 	}
-- 
2.17.0