[PATCH 2/3] dm-flakey: fix a bug with 32-bit highmem systems

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The function page_address does not work with 32-bit systems with high
memory. Use bvec_kmap_local/kunmap_local instead.

Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx

---
 drivers/md/dm-flakey.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: bcachefs/drivers/md/dm-flakey.c
===================================================================
--- bcachefs.orig/drivers/md/dm-flakey.c	2023-01-22 16:58:40.000000000 +0100
+++ bcachefs/drivers/md/dm-flakey.c	2023-01-22 17:13:53.000000000 +0100
@@ -307,8 +307,9 @@ static void corrupt_bio_data(struct bio
 			struct page *page = bio_iter_page(bio, iter);
 			if (unlikely(page == ZERO_PAGE(0)))
 				break;
-			segment = (page_address(page) + bio_iter_offset(bio, iter));
+			segment = bvec_kmap_local(&bvec);
 			segment[corrupt_bio_byte] = fc->corrupt_bio_value;
+			kunmap_local(segment);
 			DMDEBUG("Corrupting data bio=%p by writing %u to byte %u "
 				"(rw=%c bi_opf=%u bi_sector=%llu size=%u)\n",
 				bio, fc->corrupt_bio_value, fc->corrupt_bio_byte,
--
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