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    Subject[PATCH 13/15] x86, cpu: Use LTO for cpu.c with CFI
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    Allow LTO to be used for cpu.c when CONFIG_CFI_CLANG is enabled to avoid
    indirect call failures. CFI requires Clang >= 12, which doesn't have the
    stack protector inlining bug.

    Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
    ---
    arch/x86/power/Makefile | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile
    index 379777572bc9..a0532851fed7 100644
    --- a/arch/x86/power/Makefile
    +++ b/arch/x86/power/Makefile
    @@ -4,9 +4,11 @@
    # itself be stack-protected
    CFLAGS_cpu.o := -fno-stack-protector

    +ifndef CONFIG_CFI_CLANG
    # Clang may incorrectly inline functions with stack protector enabled into
    # __restore_processor_state(): https://bugs.llvm.org/show_bug.cgi?id=47479
    CFLAGS_REMOVE_cpu.o := $(CC_FLAGS_LTO)
    +endif

    obj-$(CONFIG_PM_SLEEP) += cpu.o
    obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o
    --
    2.31.1.368.gbe11c130af-goog
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