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

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Hi Nicholas,

On 09/12/2016 07:00 PM, Nicholas Piggin wrote:
> On Mon, 12 Sep 2016 15:24:43 -0700
> Guenter Roeck <linux@roeck-us.net> 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

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Build failure in -next due to 'kbuild: allow archs to select link  dead code/data elimination' Guenter Roeck <linux@roeck-us.net> - 2016-09-13 00:30 +0200
  Re: Build failure in -next due to 'kbuild: allow archs to select  link dead code/data elimination' Nicholas Piggin <npiggin@gmail.com> - 2016-09-13 04:10 +0200
    Re: Build failure in -next due to 'kbuild: allow archs to select link  dead code/data elimination' Guenter Roeck <linux@roeck-us.net> - 2016-09-13 05:20 +0200
      Re: Build failure in -next due to 'kbuild: allow archs to select  link dead code/data elimination' Nicholas Piggin <npiggin@gmail.com> - 2016-09-13 06:00 +0200
        Re: Build failure in -next due to 'kbuild: allow archs to select link  dead code/data elimination' Guenter Roeck <linux@roeck-us.net> - 2016-09-13 22:30 +0200
          Re: Build failure in -next due to 'kbuild: allow archs to select  link dead code/data elimination' Nicholas Piggin <npiggin@gmail.com> - 2016-09-14 04:40 +0200
            Re: Build failure in -next due to 'kbuild: allow archs to select  link dead code/data elimination' Guenter Roeck <linux@roeck-us.net> - 2016-09-14 21:50 +0200
              Re: Build failure in -next due to 'kbuild: allow archs to select link  dead code/data elimination' Michal Marek <mmarek@suse.com> - 2016-09-22 14:40 +0200

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