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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-06 13:54:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-06 13:54:56 -0700
commitf68e556e23d1a4176b563bcb25d8baf2c5313f91 (patch)
tree4c43c375dd0c608ed506953d80ebfedacca37161 /net/phonet
parent23f347ef63aa36b5a001b6791f657cd0e2a04de3 (diff)
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>
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