diff mbox series

[v2] purgatory: fix disabling debug info

Message ID 20230326182120.194541-1-hi@alyssa.is (mailing list archive)
State Superseded
Headers show
Series [v2] purgatory: fix disabling debug info | expand

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conchuod/build_rv32_defconfig success Build OK
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conchuod/verify_fixes success Fixes tag looks correct
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Commit Message

Alyssa Ross March 26, 2023, 6:21 p.m. UTC 
Since 32ef9e5054ec, -Wa,-gdwarf-2 is no longer used in KBUILD_AFLAGS.
Instead, it includes -g, the appropriate -gdwarf-* flag, and also the
-Wa versions of both of those if building with Clang and GNU as.  As a
result, debug info was being generated for the purgatory objects, even
though the intention was that it not be.

Fixes: 32ef9e5054ec ("Makefile.debug: re-enable debug info for .S files")
Signed-off-by: Alyssa Ross <hi@alyssa.is>
Cc: stable@vger.kernel.org
---

Difference from v2: replace each AFLAGS_REMOVE_* assignment with a
single aflags-remove-y line, and use foreach to add the -Wa versions,
as suggested by Masahiro Yamada.

 arch/riscv/purgatory/Makefile | 7 +------
 arch/x86/purgatory/Makefile   | 3 +--
 2 files changed, 2 insertions(+), 8 deletions(-)


base-commit: da8e7da11e4ba758caf4c149cc8d8cd555aefe5f

Comments

Masahiro Yamada March 27, 2023, 2:41 a.m. UTC | #1 
On Mon, Mar 27, 2023 at 3:23 AM Alyssa Ross <hi@alyssa.is> wrote:
>
> Since 32ef9e5054ec, -Wa,-gdwarf-2 is no longer used in KBUILD_AFLAGS.
> Instead, it includes -g, the appropriate -gdwarf-* flag, and also the
> -Wa versions of both of those if building with Clang and GNU as.  As a
> result, debug info was being generated for the purgatory objects, even
> though the intention was that it not be.
>
> Fixes: 32ef9e5054ec ("Makefile.debug: re-enable debug info for .S files")
> Signed-off-by: Alyssa Ross <hi@alyssa.is>
> Cc: stable@vger.kernel.org



Thanks, looks good to me.

I can offer to pick this up to my tree later,
but I will wait for Ack from the arch maintainers
and other comments.







> ---
>
> Difference from v2: replace each AFLAGS_REMOVE_* assignment with a
> single aflags-remove-y line, and use foreach to add the -Wa versions,
> as suggested by Masahiro Yamada.
>
>  arch/riscv/purgatory/Makefile | 7 +------
>  arch/x86/purgatory/Makefile   | 3 +--
>  2 files changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile
> index d16bf715a586..5730797a6b40 100644
> --- a/arch/riscv/purgatory/Makefile
> +++ b/arch/riscv/purgatory/Makefile
> @@ -84,12 +84,7 @@ CFLAGS_string.o                      += $(PURGATORY_CFLAGS)
>  CFLAGS_REMOVE_ctype.o          += $(PURGATORY_CFLAGS_REMOVE)
>  CFLAGS_ctype.o                 += $(PURGATORY_CFLAGS)
>
> -AFLAGS_REMOVE_entry.o          += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_memcpy.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_memset.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strcmp.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strlen.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strncmp.o                += -Wa,-gdwarf-2
> +asflags-remove-y               += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
>
>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>                 $(call if_changed,ld)
> diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
> index 17f09dc26381..82fec66d46d2 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -69,8 +69,7 @@ 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
> +asflags-remove-y               += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
>
>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>                 $(call if_changed,ld)
>
> base-commit: da8e7da11e4ba758caf4c149cc8d8cd555aefe5f
> --
> 2.37.1
>
Nick Desaulniers March 27, 2023, 10:12 p.m. UTC | #2 
On Sun, Mar 26, 2023 at 11:23 AM Alyssa Ross <hi@alyssa.is> wrote:
>
> Since 32ef9e5054ec, -Wa,-gdwarf-2 is no longer used in KBUILD_AFLAGS.
> Instead, it includes -g, the appropriate -gdwarf-* flag, and also the
> -Wa versions of both of those if building with Clang and GNU as.  As a
> result, debug info was being generated for the purgatory objects, even
> though the intention was that it not be.

Ah, good catch!

>
> Fixes: 32ef9e5054ec ("Makefile.debug: re-enable debug info for .S files")
> Signed-off-by: Alyssa Ross <hi@alyssa.is>
> Cc: stable@vger.kernel.org
> ---
>
> Difference from v2: replace each AFLAGS_REMOVE_* assignment with a
> single aflags-remove-y line, and use foreach to add the -Wa versions,
> as suggested by Masahiro Yamada.
>
>  arch/riscv/purgatory/Makefile | 7 +------
>  arch/x86/purgatory/Makefile   | 3 +--
>  2 files changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile
> index d16bf715a586..5730797a6b40 100644
> --- a/arch/riscv/purgatory/Makefile
> +++ b/arch/riscv/purgatory/Makefile
> @@ -84,12 +84,7 @@ CFLAGS_string.o                      += $(PURGATORY_CFLAGS)
>  CFLAGS_REMOVE_ctype.o          += $(PURGATORY_CFLAGS_REMOVE)
>  CFLAGS_ctype.o                 += $(PURGATORY_CFLAGS)
>
> -AFLAGS_REMOVE_entry.o          += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_memcpy.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_memset.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strcmp.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strlen.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strncmp.o                += -Wa,-gdwarf-2

Removing the explicit `-Wa,-gdwarf-2` makes sense; nothing ever sets it.

> +asflags-remove-y               += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))

Is it simpler to just append `-g0` to the running list of asflags;
that should also disable the emission of debug info? Or does that not
remove debug info from the assembler?

Either way:
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
and thanks for the patch!

>
>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>                 $(call if_changed,ld)
> diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
> index 17f09dc26381..82fec66d46d2 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -69,8 +69,7 @@ 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
> +asflags-remove-y               += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
>
>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>                 $(call if_changed,ld)
>
> base-commit: da8e7da11e4ba758caf4c149cc8d8cd555aefe5f
> --
> 2.37.1
>
Masahiro Yamada April 7, 2023, 3:14 p.m. UTC | #3 
On Mon, Mar 27, 2023 at 3:23 AM Alyssa Ross <hi@alyssa.is> wrote:
>
> Since 32ef9e5054ec, -Wa,-gdwarf-2 is no longer used in KBUILD_AFLAGS.
> Instead, it includes -g, the appropriate -gdwarf-* flag, and also the
> -Wa versions of both of those if building with Clang and GNU as.  As a
> result, debug info was being generated for the purgatory objects, even
> though the intention was that it not be.
>
> Fixes: 32ef9e5054ec ("Makefile.debug: re-enable debug info for .S files")
> Signed-off-by: Alyssa Ross <hi@alyssa.is>
> Cc: stable@vger.kernel.org
> ---
>
> Difference from v2: replace each AFLAGS_REMOVE_* assignment with a
> single aflags-remove-y line, and use foreach to add the -Wa versions,
> as suggested by Masahiro Yamada.


Applied to linux-kbuild/fixes.
Thanks.


>  arch/riscv/purgatory/Makefile | 7 +------
>  arch/x86/purgatory/Makefile   | 3 +--
>  2 files changed, 2 insertions(+), 8 deletions(-)
>
> diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile
> index d16bf715a586..5730797a6b40 100644
> --- a/arch/riscv/purgatory/Makefile
> +++ b/arch/riscv/purgatory/Makefile
> @@ -84,12 +84,7 @@ CFLAGS_string.o                      += $(PURGATORY_CFLAGS)
>  CFLAGS_REMOVE_ctype.o          += $(PURGATORY_CFLAGS_REMOVE)
>  CFLAGS_ctype.o                 += $(PURGATORY_CFLAGS)
>
> -AFLAGS_REMOVE_entry.o          += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_memcpy.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_memset.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strcmp.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strlen.o         += -Wa,-gdwarf-2
> -AFLAGS_REMOVE_strncmp.o                += -Wa,-gdwarf-2
> +asflags-remove-y               += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
>
>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>                 $(call if_changed,ld)
> diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
> index 17f09dc26381..82fec66d46d2 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -69,8 +69,7 @@ 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
> +asflags-remove-y               += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
>
>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>                 $(call if_changed,ld)
>
> base-commit: da8e7da11e4ba758caf4c149cc8d8cd555aefe5f
> --
> 2.37.1
>
diff mbox series

Patch

diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile
index d16bf715a586..5730797a6b40 100644
--- a/arch/riscv/purgatory/Makefile
+++ b/arch/riscv/purgatory/Makefile
@@ -84,12 +84,7 @@  CFLAGS_string.o			+= $(PURGATORY_CFLAGS)
 CFLAGS_REMOVE_ctype.o		+= $(PURGATORY_CFLAGS_REMOVE)
 CFLAGS_ctype.o			+= $(PURGATORY_CFLAGS)
 
-AFLAGS_REMOVE_entry.o		+= -Wa,-gdwarf-2
-AFLAGS_REMOVE_memcpy.o		+= -Wa,-gdwarf-2
-AFLAGS_REMOVE_memset.o		+= -Wa,-gdwarf-2
-AFLAGS_REMOVE_strcmp.o		+= -Wa,-gdwarf-2
-AFLAGS_REMOVE_strlen.o		+= -Wa,-gdwarf-2
-AFLAGS_REMOVE_strncmp.o		+= -Wa,-gdwarf-2
+asflags-remove-y		+= $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
 
 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
 		$(call if_changed,ld)
diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 17f09dc26381..82fec66d46d2 100644
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -69,8 +69,7 @@  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
+asflags-remove-y		+= $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
 
 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
 		$(call if_changed,ld)