1 files changed, 19 insertions, 0 deletions

diff --git a/block/blk-core.c b/block/blk-core.c
index 71da5111120c..718897e6d37f 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2358,6 +2358,25 @@ void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
                 rq->rq_disk = bio->bi_bdev->bd_disk;
 }
 
+#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
+/**
+ * rq_flush_dcache_pages - Helper function to flush all pages in a request
+ * @rq: the request to be flushed
+ *
+ * Description:
+ *     Flush all pages in @rq.
+ */
+void rq_flush_dcache_pages(struct request *rq)
+{
+        struct req_iterator iter;
+        struct bio_vec *bvec;
+
+        rq_for_each_segment(bvec, rq, iter)
+                flush_dcache_page(bvec->bv_page);
+}
+EXPORT_SYMBOL_GPL(rq_flush_dcache_pages);
+#endif
+
 /**
  * blk_lld_busy - Check if underlying low-level drivers of a device are busy
  * @q : the queue of the device being checked