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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
This commit is contained in:
Pingfan Liu 2020-08-03 13:49:48 +08:00 committed by Ingo Molnar
parent 7d98585860
commit 52416ffcf8
1 changed files with 4 additions and 1 deletions
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5
arch/x86/purgatory/Makefile
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@ -32,7 +32,7 @@ KCOV_INSTRUMENT := n
# make up the standalone purgatory.ro # make up the standalone purgatory.ro
PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 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 += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
PURGATORY_CFLAGS += $(call cc-option,-fno-stack-protector) 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_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE)
CFLAGS_string.o += $(PURGATORY_CFLAGS) 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 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
$(call if_changed,ld) $(call if_changed,ld)