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

Nicholas Piggin
2018-04-20T07:34:27Z

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.

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(-)

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2.17.0