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ARM: mach-bcm: disable ftrace in SMC invocation routines 

The SMC calling convention uses R7 as an argument register, which
conflicts with its use as a frame pointer when building in Thumb2 mode.
Given that Clang with ftrace does not permit frame pointers to be
disabled, let's omit this compilation unit from ftrace instrumentation.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
This commit is contained in:
Ard Biesheuvel 2022-02-01 11:56:44 +01:00
parent 1f640552d9
commit 64dff07b1c
1 changed files with 1 additions and 0 deletions
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arch/arm/mach-bcm/Makefile
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@ -40,6 +40,7 @@ obj-$(CONFIG_ARCH_BCM_MOBILE_L2_CACHE) += kona_l2_cache.o
# Support for secure monitor traps
obj-$(CONFIG_ARCH_BCM_MOBILE_SMC) += bcm_kona_smc.o
CFLAGS_REMOVE_bcm_kona_smc.o += $(CC_FLAGS_FTRACE)
# BCM2835
ifeq ($(CONFIG_ARCH_BCM2835),y)