Re: Build failure in -next due to 'kbuild: allow archs to select link dead code/data elimination'

[Guenter Roeck]

Hi Nicholas,

On 09/12/2016 07:00 PM, Nicholas Piggin wrote:
> On Mon, 12 Sep 2016 15:24:43 -0700
> Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>
> > Hi,
> >
> > your commit 'kbuild: allow archs to select link dead code/data elimination'
> > is causing the following build failure in -next when building score:defconfig.
> >
> > arch/score/kernel/built-in.o: In function `work_resched':
> > arch/score/kernel/entry.o:(.text+0xe84):
> > 	relocation truncated to fit: R_SCORE_PC19 against `schedule'
> >
> > Reverting the commit fixes the problem.
> >
> > Please let me know if I can help tracking down the problem.
> > In case you need a score toochain, you can find the one I use at
> > http://server.roeck-us.net/toolchains/score.tgz.
> >
> > Thanks,
> > Guenter
>
> It's not supposed to have any real effect unless the
> option is selected, but there are a few changes to linker
> script which must be causing it.
>
> There are two changes to vmlinux.lds.h. One is to KEEP a
> few input sections, that *should* be kept anyway. The other
> is to bring in additional sections into their correct output
> section.
>
> Could you try reverting those lines of vmlinux.lds.h that
> change the latter, i.e.:
>
> -		*(.text.hot .text .text.fixup .text.unlikely)		\
> +		*(.text.hot .text .text.fixup .text.unlikely .text.*)	\

This is the culprit. After removing " .text.*" it builds fine.

Guenter