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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-06 13:54:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-06 13:54:56 -0700 |
commit | f68e556e23d1a4176b563bcb25d8baf2c5313f91 (patch) | |
tree | 4c43c375dd0c608ed506953d80ebfedacca37161 /drivers/net/ppp | |
parent | 23f347ef63aa36b5a001b6791f657cd0e2a04de3 (diff) | |
download | linux-f68e556e23d1a4176b563bcb25d8baf2c5313f91.tar.gz linux-f68e556e23d1a4176b563bcb25d8baf2c5313f91.tar.bz2 linux-f68e556e23d1a4176b563bcb25d8baf2c5313f91.zip |
Make the "word-at-a-time" helper functions more commonly usable
I have a new optimized x86 "strncpy_from_user()" that will use these
same helper functions for all the same reasons the name lookup code uses
them. This is preparation for that.
This moves them into an architecture-specific header file. It's
architecture-specific for two reasons:
- some of the functions are likely to want architecture-specific
implementations. Even if the current code happens to be "generic" in
the sense that it should work on any little-endian machine, it's
likely that the "multiply by a big constant and shift" implementation
is less than optimal for an architecture that has a guaranteed fast
bit count instruction, for example.
- I expect that if architectures like sparc want to start playing
around with this, we'll need to abstract out a few more details (in
particular the actual unaligned accesses). So we're likely to have
more architecture-specific stuff if non-x86 architectures start using
this.
(and if it turns out that non-x86 architectures don't start using
this, then having it in an architecture-specific header is still the
right thing to do, of course)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/net/ppp')
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