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| author | Mikulas Patocka <[email protected]> | 2024-02-20 18:11:51 +0000 |
|---|---|---|
| committer | Mike Snitzer <[email protected]> | 2024-02-20 18:34:32 +0000 |
| commit | 787f1b2800464aa277236a66eb3c279535edd460 (patch) | |
| tree | 03a370dd0d630c2285e52ef27bd9e85b18bf5f3a /net/switchdev/switchdev.c | |
| parent | dm-crypt: recheck the integrity tag after a failure (diff) | |
| download | kernel-787f1b2800464aa277236a66eb3c279535edd460.tar.gz kernel-787f1b2800464aa277236a66eb3c279535edd460.zip | |
dm-verity, dm-crypt: align "struct bvec_iter" correctly
"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 <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
Diffstat (limited to 'net/switchdev/switchdev.c')
0 files changed, 0 insertions, 0 deletions