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arm64: Turn "broken gas inst" into real config option

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Use the new 'as-instr' Kconfig macro to define CONFIG_BROKEN_GAS_INST
directly, making it available everywhere.

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
[will: Drop redundant 'y if' logic]
Signed-off-by: Will Deacon <will@kernel.org>
Change-Id: I43a4abb60279170342c7bb20be3576f7cfc3aad5
This commit is contained in:
Vladimir Murzin 2020-01-15 14:18:25 +00:00 • committed by Michael Bestas
commit 521f3c3992
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GPG key ID: CC95044519BE6669
2 changed files with 6 additions and 8 deletions
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3
arch/arm64/Kconfig
View file

@ -318,6 +318,9 @@ config ARCH_SUPPORTS_UPROBES
config ARCH_PROC_KCORE_TEXT
def_bool y
config BROKEN_GAS_INST
def_bool !$(as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n)
config KASAN_SHADOW_OFFSET
hex
depends on KASAN

11
arch/arm64/Makefile
View file

@ -42,12 +42,8 @@ cc_has_k_constraint := $(call try-run,echo \
return 0; \
}' | $(CC) -S -x c -o "$$TMP" -,,-DCONFIG_CC_HAS_K_CONSTRAINT=1)
ifeq ($(CONFIG_ARM64), y)
brokengasinst := $(call as-instr,1:\n.inst 0\n.rept . - 1b\n\nnop\n.endr\n,,-DCONFIG_BROKEN_GAS_INST=1)
ifneq ($(brokengasinst),)
ifeq ($(CONFIG_BROKEN_GAS_INST),y)
$(warning Detected assembler with broken .inst; disassembly will be unreliable)
endif
endif
ifdef CONFIG_CC_IS_CLANG
@ -56,11 +52,10 @@ else
KBUILD_CFLAGS += -mgeneral-regs-only
endif
KBUILD_CFLAGS += $(brokengasinst) \
$(compat_vdso) $(cc_has_k_constraint)
KBUILD_CFLAGS += $(compat_vdso) $(cc_has_k_constraint)
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS += $(call cc-disable-warning, psabi)
KBUILD_AFLAGS += $(brokengasinst) $(compat_vdso)
KBUILD_AFLAGS += $(compat_vdso)
KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)