[PATCH v5 28/29] x86, cpu: disable LTO for cpu.c
From: Sami Tolvanen <samitolvanen@google.com>
Date: 2020-10-09 16:15:16
Also in:
linux-arch, linux-kbuild, linux-pci, lkml
Subsystem:
hibernation (aka software suspend, aka swsusp), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
"Rafael J. Wysocki", Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Clang incorrectly inlines functions with differing stack protector attributes, which breaks __restore_processor_state() that relies on stack protector being disabled. This change disables LTO for cpu.c to work aroung the bug. Link: https://bugs.llvm.org/show_bug.cgi?id=47479 Suggested-by: Nick Desaulniers <redacted> Signed-off-by: Sami Tolvanen <samitolvanen@google.com> --- arch/x86/power/Makefile | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile
index 6907b523e856..5f711a441623 100644
--- a/arch/x86/power/Makefile
+++ b/arch/x86/power/Makefile@@ -5,5 +5,9 @@ OBJECT_FILES_NON_STANDARD_hibernate_asm_$(BITS).o := y # itself be stack-protected CFLAGS_cpu.o := -fno-stack-protector +# 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 := $(CC_FLAGS_LTO) + obj-$(CONFIG_PM_SLEEP) += cpu.o obj-$(CONFIG_HIBERNATION) += hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o
--
2.28.0.1011.ga647a8990f-goog
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