Re: [PATCH 0/4] LD_DEAD_CODE_DATA_ELIMINATION fixes and enabling for powerpc

Christophe LEROY
2018-04-20T10:02:39Z

Le 20/04/2018 à 09:34, Nicholas Piggin a écrit :
> A few people have been interested in this again. And I promised
> if it remains dead code it should be removed, so I would like to
> have another try.
>
> I think I got snagged on the modules problem last time and did
> not take the time to work it out, this time I just turned off the
> compile options for modules (the linker option was never set anyway
> so no loss).
>
> This includes some linker script catches and ideas from others, I
> didn't documnt them all, but thanks for looking.

Thanks a lot.

It works well on both my 8xx and 83xx targets. I don't have
CONFIG_MODULE set.

Christophe

>
> I would be interested to help other archs get this working too, if
> anybody needs some help.
>
> Thanks,
> Nick
>
> Nicholas Piggin (4):
> kbuild: Fix asm-generic/vmlinux.lds.h for
> LD_DEAD_CODE_DATA_ELIMINATION
> kbuild: LD_DEAD_CODE_DATA_ELIMINATION no
> -ffunction-sections/-fdata-sections for module build
> kbuild: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selectable if
> enabled
> powerpc: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selected
>
> Makefile | 4 +--
> arch/Kconfig | 15 ----------
> arch/powerpc/Kconfig | 1 +
> arch/powerpc/kernel/vmlinux.lds.S | 22 +++++++-------
> include/asm-generic/vmlinux.lds.h | 49 ++++++++++++++++++-------------
> init/Kconfig | 27 +++++++++++++++++
> 6 files changed, 70 insertions(+), 48 deletions(-)
>