Re: [PATCHv2] x86/purgatory: don't generate debug info for purgatory.ro
On 08/03/20 at 01:49pm, Pingfan Liu wrote: > 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 > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: Borislav Petkov > Cc: "H. Peter Anvin" > Cc: Hans de Goede > Cc: Nick Desaulniers > Cc: Arvind Sankar > Cc: Steve Wahl > Cc: linux-kernel@vger.kernel.org > Cc: ke...@lists.infradead.org > To: x...@kernel.org > --- > 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 088bd76..d24b43a 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) > > -- > 2.7.5 > > > ___ > kexec mailing list > ke...@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec > Hi Pingfan, Looks good, thanks for the patch. Acked-by: Dave Young Thanks Dave
Re: [PATCHv2] x86/purgatory: don't generate debug info for purgatory.ro
Reviewed-by: Steve Wahl On Mon, Aug 03, 2020 at 01:49:48PM +0800, Pingfan Liu wrote: > 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 > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: Borislav Petkov > Cc: "H. Peter Anvin" > Cc: Hans de Goede > Cc: Nick Desaulniers > Cc: Arvind Sankar > Cc: Steve Wahl > Cc: linux-kernel@vger.kernel.org > Cc: ke...@lists.infradead.org > To: x...@kernel.org > --- > 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 088bd76..d24b43a 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) > > -- > 2.7.5 >
Re: [PATCHv2] x86/purgatory: don't generate debug info for purgatory.ro
On Sun, Aug 2, 2020 at 10:50 PM Pingfan Liu wrote: > > 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 > Cc: Thomas Gleixner > Cc: Ingo Molnar > Cc: Borislav Petkov > Cc: "H. Peter Anvin" > Cc: Hans de Goede > Cc: Nick Desaulniers > Cc: Arvind Sankar > Cc: Steve Wahl > Cc: linux-kernel@vger.kernel.org > Cc: ke...@lists.infradead.org > To: x...@kernel.org Reviewed-by: Nick Desaulniers > --- Thanks for the patch! One thing that can be handy for reviewers (but isn't strictly necessary) is to put a comment about what changed since the previous version below the above^ `---` line. By putting comments "below the fold" you can pass along information to the reviewers that won't wind up in `git log` when committed. Not strictly necessary, and less so for smaller patches, but hope this helps. (No need for a v3 over that). > 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 088bd76..d24b43a 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) > > -- > 2.7.5 > -- Thanks, ~Nick Desaulniers
[PATCHv2] 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 Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Hans de Goede Cc: Nick Desaulniers Cc: Arvind Sankar Cc: Steve Wahl Cc: linux-kernel@vger.kernel.org Cc: ke...@lists.infradead.org To: x...@kernel.org --- 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 088bd76..d24b43a 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) -- 2.7.5
