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Message-ID: <20240229204127.2861980-8-sashal@kernel.org>
Date: Thu, 29 Feb 2024 15:41:25 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Mikulas Patocka <mpatocka@...hat.com>,
Mike Snitzer <snitzer@...nel.org>,
Sasha Levin <sashal@...nel.org>,
agk@...hat.com,
dm-devel@...ts.linux.dev
Subject: [PATCH AUTOSEL 5.10 8/8] dm-verity, dm-crypt: align "struct bvec_iter" correctly
From: Mikulas Patocka <mpatocka@...hat.com>
[ Upstream commit 787f1b2800464aa277236a66eb3c279535edd460 ]
"struct bvec_iter" is defined with the __packed attribute, so it is
aligned on a single byte. On X86 (and on other architectures that support
unaligned addresses in hardware), "struct bvec_iter" is accessed using the
8-byte and 4-byte memory instructions, however these instructions are less
efficient if they operate on unaligned addresses.
(on RISC machines that don't have unaligned access in hardware, GCC
generates byte-by-byte accesses that are very inefficient - see [1])
This commit reorders the entries in "struct dm_verity_io" and "struct
convert_context", so that "struct bvec_iter" is aligned on 8 bytes.
[1] https://lore.kernel.org/all/ZcLuWUNRZadJr0tQ@fedora/T/
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/md/dm-crypt.c | 4 ++--
drivers/md/dm-verity.h | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 5d772f322a245..bed685969ad49 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -48,11 +48,11 @@
struct convert_context {
struct completion restart;
struct bio *bio_in;
- struct bio *bio_out;
struct bvec_iter iter_in;
+ struct bio *bio_out;
struct bvec_iter iter_out;
- u64 cc_sector;
atomic_t cc_pending;
+ u64 cc_sector;
union {
struct skcipher_request *req;
struct aead_request *req_aead;
diff --git a/drivers/md/dm-verity.h b/drivers/md/dm-verity.h
index 78d1e51195ada..f61c89c79cf5b 100644
--- a/drivers/md/dm-verity.h
+++ b/drivers/md/dm-verity.h
@@ -74,11 +74,11 @@ struct dm_verity_io {
/* original value of bio->bi_end_io */
bio_end_io_t *orig_bi_end_io;
+ struct bvec_iter iter;
+
sector_t block;
unsigned n_blocks;
- struct bvec_iter iter;
-
struct work_struct work;
/*
--
2.43.0
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