Re: [PATCH 1 of 3] Introduce __memcpy_toio32

[Roland Dreier <rdreier@cisco.com>]

 > > You're adding this symbol and exporting it even if the arch will
 > > supply its own version.  So this is pure kernel .text bloat...

 > I don't know what you'd prefer, so let me enumerate a few alternatives,
 > and you can either tell me which you'd prefer, or point out something
 > I've missed that would be even better.  I'm entirely flexible on this.
 > 
 >       * Use the __HAVE_ARCH_* mechanism that include/asm-*/string.h
 >         uses.  Caveat: Linus has lately come out as hating this style.
 >         It makes for the smallest patch, though.
 >       * Define the generic code in lib/, and have each arch that really
 >         uses it export it.
 >       * Put generic code in include/asm-generic/algo-memcpy_toio32.h,
 >         and have each arch that needs it #include it somewhere and use
 >         it.

The middle alternative seems the cleanest, although I'm not sure where
the export really belongs.

I don't think I could really say the right way to do this without
thinking some more -- but I am positive that exporting a function that
will never ever be called is something we should work hard to avoid.

 - R.