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authorPingfan Liu <kernelfans@gmail.com>2020-08-03 08:49:48 +0300
committerIngo Molnar <mingo@kernel.org>2020-08-07 02:32:00 +0300
commit52416ffcf823ee11aa19792715664ab94757f111 (patch)
tree3c66b1d806bf27a7415a841e65813c6f56131814 /arch/x86/purgatory
parent7d98585860d845e36ee612832a5ff021f201dbaf (diff)
downloadlinux-52416ffcf823ee11aa19792715664ab94757f111.tar.xz
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 <kernelfans@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Steve Wahl <steve.wahl@hpe.com> Acked-by: Dave Young <dyoung@redhat.com> Link: https://lore.kernel.org/r/1596433788-3784-1-git-send-email-kernelfans@gmail.com
Diffstat (limited to 'arch/x86/purgatory')
-rw-r--r--arch/x86/purgatory/Makefile5
1 files changed, 4 insertions, 1 deletions
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)