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Commit ef2aab86 authored by Pingfan Liu's avatar Pingfan Liu Committed by Greg Kroah-Hartman
Browse files

x86/purgatory: Don't generate debug info for purgatory.ro 



commit 52416ffcf823ee11aa19792715664ab94757f111 upstream.

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: default avatarPingfan Liu <kernelfans@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Reviewed-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Reviewed-by: default avatarSteve Wahl <steve.wahl@hpe.com>
Acked-by: default avatarDave Young <dyoung@redhat.com>
Link: https://lore.kernel.org/r/1596433788-3784-1-git-send-email-kernelfans@gmail.com


[Alyssa: fixed for LLVM_IAS=1 by adding -g to AFLAGS_REMOVE_*]
Signed-off-by: default avatarAlyssa Ross <hi@alyssa.is>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c22aefae

arch/x86/purgatory/Makefile

+4 −1
Original line number Diff line number Diff line
@@ -27,7 +27,7 @@ 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



# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
@@ -58,6 +58,9 @@ CFLAGS_sha256.o += $(PURGATORY_CFLAGS) 
CFLAGS_REMOVE_string.o		+= $(PURGATORY_CFLAGS_REMOVE)

CFLAGS_string.o			+= $(PURGATORY_CFLAGS)



AFLAGS_REMOVE_setup-x86_$(BITS).o	+= -g -Wa,-gdwarf-2

AFLAGS_REMOVE_entry64.o			+= -g -Wa,-gdwarf-2



$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE

		$(call if_changed,ld)