On Wednesday, August 3, 2016 2:44:29 PM CEST Segher Boessenkool wrote:

Hi Arnd,

On Wed, Aug 03, 2016 at 08:52:48PM +0200, Arnd Bergmann wrote:

quoted

From my first look, it seems that all of lib/*.o is now getting linked
into vmlinux, while we traditionally leave out everything from lib/
that is not referenced.

I also see a noticeable overhead in link time, the numbers are for
a cache-hot rebuild after a successful allyesconfig build, using a
24-way Opteron@2.5Ghz, just relinking vmlinux:

$ time make skj30 vmlinux # before
real	2m8.092s
user	3m41.008s
sys	0m48.172s

$ time make skj30 vmlinux # after
real	4m10.189s
user	5m43.804s
sys	0m52.988s

Is it better when using rcT instead of rcsT?

It seems to be noticeably better for the clean rebuild case, though
not as good as the original:

real	3m34.015s
user	5m7.104s
sys	0m49.172s

I've also tried now with my own patch applied as well (linking
each drivers/*/built-in.o into vmlinux rather than having them
linked into drivers/built-in.o first), but that makes no
difference.

	Arnd