diff mbox series

purgatory: fix disabling debug info

Message ID	20230326153412.63128-1-hi@alyssa.is
State	New
Headers	Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Feedback-ID: i12284293:Fastmail From: Alyssa Ross <hi@alyssa.is> To: Masahiro Yamada <masahiroy@kernel.org> Cc: Nick Cao <nickcao@nichi.co>, linux-kbuild@vger.kernel.org, Nick Desaulniers <ndesaulniers@google.com>, Nathan Chancellor <nathan@kernel.org>, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, linux-riscv@lists.infradead.org, Tom Rix <trix@redhat.com>, Albert Ou <aou@eecs.berkeley.edu>, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, Alyssa Ross <hi@alyssa.is>, stable@vger.kernel.org Subject: [PATCH] purgatory: fix disabling debug info Date: Sun, 26 Mar 2023 15:34:12 +0000 Message-Id: <20230326153412.63128-1-hi@alyssa.is> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	purgatory: fix disabling debug info \| purgatory: fix disabling debug info

Commit Message

Alyssa Ross March 26, 2023, 3:34 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
---
 arch/riscv/purgatory/Makefile | 12 ++++++------
 arch/x86/purgatory/Makefile   |  4 ++--
 2 files changed, 8 insertions(+), 8 deletions(-)


base-commit: da8e7da11e4ba758caf4c149cc8d8cd555aefe5f

Comments

Masahiro Yamada March 26, 2023, 4:34 p.m. UTC | #1

On Mon, Mar 27, 2023 at 12:35 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
> ---
>  arch/riscv/purgatory/Makefile | 12 ++++++------
>  arch/x86/purgatory/Makefile   |  4 ++--
>  2 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile
> index d16bf715a586..97001798fa19 100644
> --- a/arch/riscv/purgatory/Makefile
> +++ b/arch/riscv/purgatory/Makefile
> @@ -84,12 +84,12 @@ 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
> +AFLAGS_REMOVE_entry.o          += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_memcpy.o         += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_memset.o         += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_strcmp.o         += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_strlen.o         += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_strncmp.o                += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5


You can merge these into a single line:

 asflags-remove-y += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5


Or, a slightly shorter but tricky way is:

 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..f1b1ef6c4cbf 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -69,8 +69,8 @@ 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
> +AFLAGS_REMOVE_setup-x86_$(BITS).o      += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_entry64.o                        += -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5


Ditto.


Thanks.



>  $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>                 $(call if_changed,ld)
>
> base-commit: da8e7da11e4ba758caf4c149cc8d8cd555aefe5f
> --
> 2.37.1
>

Nick Cao March 26, 2023, 4:48 p.m. UTC | #2

With this patch applied on top of 
https://github.com/NickCao/linux/tree/f258de7fdb1e69492f8962da5d34646da49685db, 
the built kernel image no longer contains reference to the source 
directory (which is not allowed in the Nixpkgs kernel building 
infrastructure).

Tested-by: Nick Cao <nickcao@nichi.co>

On 3/26/23 23:34, Alyssa Ross 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
> ---
>   arch/riscv/purgatory/Makefile | 12 ++++++------
>   arch/x86/purgatory/Makefile   |  4 ++--
>   2 files changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile
> index d16bf715a586..97001798fa19 100644
> --- a/arch/riscv/purgatory/Makefile
> +++ b/arch/riscv/purgatory/Makefile
> @@ -84,12 +84,12 @@ 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
> +AFLAGS_REMOVE_entry.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_memcpy.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_memset.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_strcmp.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_strlen.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_strncmp.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
>   
>   $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>   		$(call if_changed,ld)
> diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
> index 17f09dc26381..f1b1ef6c4cbf 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -69,8 +69,8 @@ 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
> +AFLAGS_REMOVE_setup-x86_$(BITS).o	+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
> +AFLAGS_REMOVE_entry64.o			+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
>   
>   $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
>   		$(call if_changed,ld)
> 
> base-commit: da8e7da11e4ba758caf4c149cc8d8cd555aefe5f

diff mbox series

Patch

diff --git a/arch/riscv/purgatory/Makefile b/arch/riscv/purgatory/Makefile
index d16bf715a586..97001798fa19 100644
--- a/arch/riscv/purgatory/Makefile
+++ b/arch/riscv/purgatory/Makefile
@@ -84,12 +84,12 @@  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
+AFLAGS_REMOVE_entry.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
+AFLAGS_REMOVE_memcpy.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
+AFLAGS_REMOVE_memset.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
+AFLAGS_REMOVE_strcmp.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
+AFLAGS_REMOVE_strlen.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
+AFLAGS_REMOVE_strncmp.o		+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
 
 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
 		$(call if_changed,ld)
diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 17f09dc26381..f1b1ef6c4cbf 100644
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -69,8 +69,8 @@  CFLAGS_sha256.o			+= $(PURGATORY_CFLAGS)
 CFLAGS_REMOVE_string.o		+= $(PURGATORY_CFLAGS_REMOVE)
 CFLAGS_string.o			+= $(PURGATORY_CFLAGS)
 
-AFLAGS_REMOVE_setup-x86_$(BITS).o	+= -Wa,-gdwarf-2
-AFLAGS_REMOVE_entry64.o			+= -Wa,-gdwarf-2
+AFLAGS_REMOVE_setup-x86_$(BITS).o	+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
+AFLAGS_REMOVE_entry64.o			+= -g -gdwarf-4 -gdwarf-5 -Wa,-g -Wa,-gdwarf4 -Wa,-gdwarf-5
 
 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
 		$(call if_changed,ld)