From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 15 Oct 2021 22:55:05 +0000 (-0600)
Subject: block: align blkdev_dio inlined bio to a cacheline
X-Git-Tag: v6.6.17~8868^2~79
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=6155631a0c3b7ca795a0edb44894e58dc3e3d798;p=platform%2Fkernel%2Flinux-rpi.git

block: align blkdev_dio inlined bio to a cacheline

We get all sorts of unreliable and funky results since the bio is
designed to align on a cacheline, which it does not when inlined like
this.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/block/fops.c b/block/fops.c
index 2c43e49..21d25ee 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -137,7 +137,7 @@ struct blkdev_dio {
 	size_t			size;
 	atomic_t		ref;
 	unsigned int		flags;
-	struct bio		bio;
+	struct bio		bio ____cacheline_aligned_in_smp;
 };
 
 static struct bio_set blkdev_dio_pool;