kernel bitreverse function

[Frank Wille <frank%phoenix.owl.de@localhost>]

Hi,

is there already a global function to reverse the bits in a byte?

If not, wouldn't it be useful to put an optimized function (e.g. with
a 256-byte lookup-table, or 16-byte for the two nibbles to save space)
into the kernel, or into libkern?

Some drivers already implement their own reverse functions. And I ask,
because I need one too, for a new I2C driver.

-- 
Frank Wille