random: statically compute poolbitshift, poolbytes, poolbits

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Use a macro to statically compute poolbitshift (will be used in a
subsequent patch), poolbytes, and poolbits.  On virtually all
architectures the cost of a memory load with an offset is the same as
the one of a memory load.

It is still possible for this to generate worse code since the C
compiler doesn't know the fixed relationship between these fields, but
that is somewhat unlikely.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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H. Peter Anvin 2013-09-10 23:16:17 -04:00 • committed by Theodore Ts'o

parent 85a1f77716

commit 9ed17b70b4

1 changed files with 19 additions and 20 deletions

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39

drivers/char/random.c

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