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Commit 1873e870 authored by Andi Kleen's avatar Andi Kleen Committed by H. Peter Anvin
Browse files

debug: Add CONFIG_READABLE_ASM 



Add a config option to disable various gcc compiler optimizations that
make assembler listings much harder to read. This is everything that reorders
code significantly or creates partial functions.

This is mainly to keep kernel hackers sane.

Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1332960678-11879-2-git-send-email-andi@firstfloor.org


Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 35372a7d

Makefile

+10 −0
Original line number Diff line number Diff line
@@ -564,6 +564,16 @@ else 
KBUILD_CFLAGS	+= -O2

endif



ifdef CONFIG_READABLE_ASM

# Disable optimizations that make assembler listings hard to read.

# reorder blocks reorders the control in the function

# ipa clone creates specialized cloned functions

# partial inlining inlines only parts of functions

KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \

                 $(call cc-option,-fno-ipa-cp-clone,) \

                 $(call cc-option,-fno-partial-inlining)

endif



include $(srctree)/arch/$(SRCARCH)/Makefile



ifneq ($(CONFIG_FRAME_WARN),0)

lib/Kconfig.debug

+9 −0
Original line number Diff line number Diff line
@@ -70,6 +70,15 @@ config STRIP_ASM_SYMS 
	  that look like '.Lxxx') so they don't pollute the output of

	  get_wchan() and suchlike.



config READABLE_ASM

        bool "Generate readable assembler code"

        depends on DEBUG_KERNEL

        help

          Disable some compiler optimizations that tend to generate human unreadable

          assembler output. This may make the kernel slightly slower, but it helps

          to keep kernel developers who have to stare a lot at assembler listings

          sane.



config UNUSED_SYMBOLS

	bool "Enable unused/obsolete exported symbols"

	default y if X86