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2972bb14e4
commit 2a6c7c367d upstream.
x0 is not callee-saved in the PCS. So there is no need to specify
-fcall-used-x0.
Clang doesn't currently support -fcall-used flags. This patch will help
building the kernel with clang.
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Tri Vo <trong@android.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
20 lines
999 B
Makefile
20 lines
999 B
Makefile
lib-y := bitops.o clear_user.o delay.o copy_from_user.o \
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copy_to_user.o copy_in_user.o copy_page.o \
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clear_page.o memchr.o memcpy.o memmove.o memset.o \
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memcmp.o strcmp.o strncmp.o strlen.o strnlen.o \
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strchr.o strrchr.o
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# Tell the compiler to treat all general purpose registers (with the
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# exception of the IP registers, which are already handled by the caller
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# in case of a PLT) as callee-saved, which allows for efficient runtime
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# patching of the bl instruction in the caller with an atomic instruction
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# when supported by the CPU. Result and argument registers are handled
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# correctly, based on the function prototype.
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lib-$(CONFIG_ARM64_LSE_ATOMICS) += atomic_ll_sc.o
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CFLAGS_atomic_ll_sc.o := -ffixed-x1 -ffixed-x2 \
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-ffixed-x3 -ffixed-x4 -ffixed-x5 -ffixed-x6 \
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-ffixed-x7 -fcall-saved-x8 -fcall-saved-x9 \
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-fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12 \
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-fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15 \
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-fcall-saved-x18
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