[PATCH 2/5] kbuild: allow archs to select build for link dead code/data elimination

Arnd Bergmann arnd at arndb.de
Wed Aug 10 08:29:29 AEST 2016

On Monday, August 8, 2016 8:16:05 PM CEST Andi Kleen wrote:
> > I don't understand what led Andi Kleen to also move .text.hot and
> > .text.unlikely together with .text [2], but this may have
> > been a related issue.
> >
> > [2] https://lkml.org/lkml/2015/7/19/377
> The goal was just to move .hot and .unlikely all together, so that
> they are clustered and use the minimum amount of cache. On x86 doesn't
> matter where they are exactly, as long as each is together.
> If they are not explicitely listed then the linker interleaves
> them with the normal text, which defeats the purpose.

I still don't see it, my reading of your patch is that you did
the opposite, by changing the description that puts all .text.hot
in front of .text, and all .text.unlikely after exit.text into
one that mixes them with .text. What am I missing here?


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