From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 15 Oct 2021 16:55:05 -0600
Subject: [PATCH] block: align blkdev_dio inlined bio to a cacheline
Git-commit: 6155631a0c3b7ca795a0edb44894e58dc3e3d798
Patch-mainline: v5.16-rc1
References: jsc#PED-1183
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
block/fops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/fops.c b/block/fops.c
index 2c43e493e37c..21d25ee0e4bf 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;
--
2.35.3