From 52416ffcf823ee11aa19792715664ab94757f111 Mon Sep 17 00:00:00 2001 From: Pingfan Liu Date: Mon, 3 Aug 2020 13:49:48 +0800 Subject: [PATCH] x86/purgatory: Don't generate debug info for purgatory.ro Purgatory.ro is a standalone binary that is not linked against the rest of the kernel. Its image is copied into an array that is linked to the kernel, and from there kexec relocates it wherever it desires. Unlike the debug info for vmlinux, which can be used for analyzing crash such info is useless in purgatory.ro. And discarding them can save about 200K space. Original: 259080 kexec-purgatory.o Stripped debug info: 29152 kexec-purgatory.o Signed-off-by: Pingfan Liu Signed-off-by: Ingo Molnar Reviewed-by: Nick Desaulniers Reviewed-by: Steve Wahl Acked-by: Dave Young Link: https://lore.kernel.org/r/1596433788-3784-1-git-send-email-kernelfans@gmail.com --- arch/x86/purgatory/Makefile | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile index 088bd764e0b7..d24b43a4451a 100644 --- a/arch/x86/purgatory/Makefile +++ b/arch/x86/purgatory/Makefile @@ -32,7 +32,7 @@ KCOV_INSTRUMENT := n # make up the standalone purgatory.ro PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel -PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss +PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING PURGATORY_CFLAGS += $(call cc-option,-fno-stack-protector) @@ -64,6 +64,9 @@ CFLAGS_sha256.o += $(PURGATORY_CFLAGS) CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE) CFLAGS_string.o += $(PURGATORY_CFLAGS) +AFLAGS_REMOVE_setup-x86_$(BITS).o += -Wa,-gdwarf-2 +AFLAGS_REMOVE_entry64.o += -Wa,-gdwarf-2 + $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE $(call if_changed,ld)