You probably saw that if you change one config option, even if
linux/autoconf.h (which is included by everything) changes, the kernel is
smart enough not to recompile everything.  But with UML this no more holds.
Why?  Because, as you see in this patch, fixdep avoids making anything depend
onto linux/autoconf.h *explicitly*, but nobody taught him to do the same for
arch/um/include/uml-config.h.  So apply this patch.  Do not say "I don't want
to change the generic Kbuild for one arch": this cannot hurt.  It's a bugfix
for us, a no-op for others.

Note: with this patch, fixdep will still add a dependency from a file
containing UML_CONFIG_BYE onto CONFIG_BYE.  Since someone could think that
fixdep should grep for [^A-Z_]CONFIG_ rather than simply for CONFIG_, I've
added a comment that ask *not to fix* this "bug".
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>