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author | Joel Becker <joel.becker@oracle.com> | 2008-12-16 01:13:48 (GMT) |
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committer | Mark Fasheh <mfasheh@suse.com> | 2009-01-05 16:40:34 (GMT) |
commit | e798b3f8a920c82a8e556dd54df97f0d3d0f9144 (patch) | |
tree | 1f9c19ba29f65e44c10d77597a746224e0e72c72 /crypto | |
parent | 9d28cfb73f3abccce001daf2d247b16bf20e2248 (diff) | |
download | linux-e798b3f8a920c82a8e556dd54df97f0d3d0f9144.tar.xz |
ocfs2: Don't hand-code xor in ocfs2_hamming_encode().
When I wrote ocfs2_hamming_encode(), I was following documentation of
the algorithm and didn't have quite the (possibly still imperfect) grasp
of it I do now. As part of this, I literally hand-coded xor. I would
test a bit, and then add that bit via xor to the parity word.
I can, of course, just do a single xor of the parity word and the source
word (the code buffer bit offset). This cuts CPU usage by 53% on a
mostly populated buffer (an inode containing utmp.h inline).
Joel
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'crypto')
0 files changed, 0 insertions, 0 deletions