On Tue, May 02 2017, Christoph Hellwig wrote:

quoted

diff --git a/include/linux/bio.h b/include/linux/bio.h
index d1b04b0e99cf..0975da6bebd9 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h

@@ -373,8 +373,10 @@ static inline struct bio *bio_next_split(struct bio *bio, int sectors,
 	return bio_split(bio, sectors, gfp, bs);
 }
 
-extern struct bio_set *bioset_create(unsigned int, unsigned int);
-extern struct bio_set *bioset_create_nobvec(unsigned int, unsigned int);
+extern struct bio_set *bioset_create(unsigned int, unsigned int, int flags);
+enum {
+	BIOSET_NEED_BVECS = BIT(0),
+};

I really hate the BIT macro as it obsfucates what's going on.

So post a patch to remove it from the tree.
I happen to like it, but I wouldn't fight for it.

Why not just

	BIOSET_NEED_BVECS	= (1 << 0),

which is a lot more intuitive.

Otherwise looks fine to me:

Reviewed-by: Christoph Hellwig <hch@lst.de>

Thanks,
NeilBrown