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-rw-r--r--include/linux/blk_types.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 436f43f87da9..1e1ef210ae91 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -89,7 +89,7 @@ struct bio {
struct bio_vec bi_inline_vecs[0];
};
-#define BIO_OP_SHIFT (8 * sizeof(unsigned int) - REQ_OP_BITS)
+#define BIO_OP_SHIFT (8 * FIELD_SIZEOF(struct bio, bi_opf) - REQ_OP_BITS)
#define bio_op(bio) ((bio)->bi_opf >> BIO_OP_SHIFT)
#define bio_set_op_attrs(bio, op, op_flags) do { \