default readv/writev functions

[David Woodhouse]

joern at wohnheim.fh-wedel.de said:
>  How about the STMicro flashes with built-in ecc checks? Write less
> than 8 bytes per vector element and you're dead. Other than that, you
> are right. A central version is better for almost all chips.

The intention is that drivers can set their own readv/writev methods to 
point at these default functions, _if_ they want to. Chips which can't use 
these functions can still provide their own.

Think of it like generic_file_read etc. for file systems. You use them if 
you don't have special requirements -- otherwise you write your own.

--
dwmw2