Re: Testing of function/data-sections on linux-2.6.35-rc4

Denys Vlasenko
2010-07-26T01:31:43Z

Hi Sam,

On Friday 23 July 2010 22:35, Sam Ravnborg wrote:
> >
> > Then, in order to also garbage-collect the sections, I added
> >
> > LDFLAGS_vmlinux += --gc-sections
> >
> > in top-level Makefile.
> >
> > This requires the additional patch (linux-2.6.35-rc4-fsgs.patch)
> > which adds KEEP(section) directives to kernel linker stripts.
> > Otherwise, linker will discard some crucial sections.
> >
>
> Changelog does not address why you need:
>
> -Map $@.ldmap
>
> and what effect they have.

I didn't plan to push the last step (--gc-sections) to mainline yet.
Thus the patch has debugging stuff in it.

> And it is obvious that some archs should consolidate a little more from
> asm-generic/vmlinux.lds.h.
> But that said this patch looks much better than the initial versions posted.
>
> How do you determine which sections needs the KEEP()?
> Worth documenting for future when we add new sections.

No problem, I will be adding comments at every KEEP() why it's needed.

--
vda