[PATCH 0/7] ARM: hacks for link-time optimization

From: Arnd Bergmann
Date: Tue Feb 20 2018 - 17:00:28 EST


Hi Nico, all,

I was playing with ARM link-time optimization handling earlier this
month, and eventually got it to build cleanly with randconfig kernels,
but ended up with a lot of ugly hacks to actually pull it off.

Here are the ones that I don't think we actually want to merge,
but it may be helpful to have these for reference for the next
person that tries to make it work.

Arnd

Arnd Bergmann (7):
ARM: disallow combining XIP and LTO
ARM: LTO: avoid THUMB2_KERNEL+LTO
[HACK] pass endianess flag to LTO linker
ARM: io-acorn: fix LTO linking without CONFIG_PRINTK
ARM: fix __inflate_kernel_data stack warning for LTO
ARM: mark assembler-referenced symbols as __visible
efi: disable LTO for EFI stub

arch/arm/Kconfig | 4 +++-
arch/arm/Makefile | 2 ++
arch/arm/kernel/Makefile | 3 ---
arch/arm/kernel/head-inflate-data.c | 3 ++-
arch/arm/kernel/process.c | 2 +-
arch/arm/kernel/suspend.c | 2 ++
arch/arm/kernel/unwind.c | 1 +
arch/arm/lib/io-acorn.S | 4 ++++
arch/arm/probes/kprobes/core.c | 2 +-
arch/arm/probes/kprobes/test-core.c | 11 ++++++-----
arch/arm/vdso/vgettimeofday.c | 2 ++
drivers/bus/arm-cci.c | 6 +++---
drivers/firmware/efi/libstub/Makefile | 4 +++-
drivers/soc/bcm/brcmstb/pm/pm-arm.c | 2 +-
lib/clz_ctz.c | 20 ++++++++++----------
15 files changed, 41 insertions(+), 27 deletions(-)

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2.9.0