From: Nathan Chancellor <nathan@kernel.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>, Tom Rix <trix@redhat.com>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
llvm@lists.linux.dev, x86@kernel.org,
Dmitrii Bundin <dmitrii.bundin.a@gmail.com>,
Fangrui Song <maskray@google.com>,
Alexey Alexandrov <aalexand@google.com>,
Bill Wendling <morbo@google.com>,
Greg Thelen <gthelen@google.com>,
Arvind Sankar <nivedita@alum.mit.edu>
Subject: Re: [PATCH v2 1/5] x86/boot/compressed: prefer cc-option for CFLAGS additions
Date: Wed, 31 Aug 2022 12:41:47 -0700 [thread overview]
Message-ID: <Yw+5e0lpJsZS3eWD@dev-arch.thelio-3990X> (raw)
In-Reply-To: <20220831184408.2778264-2-ndesaulniers@google.com>
On Wed, Aug 31, 2022 at 11:44:04AM -0700, Nick Desaulniers wrote:
> We have an issue where as-option is testing new options with accumulated
> CFLAGS. This makes it so that we can't use as-option to update AFLAGS
> since many CFLAGS aren't valid AFLAGS. This is being fixed in a follow
> up patch. Before doing so, move the assembler test for
> -Wa,-mrelax-relocations=no from using as-option to cc-option.
I think the first couple of sentences might sound clearer without the
"we". Maybe something like the following?
"as-option tests new options using KBUILD_CFLAGS, which causes problems
when using as-option to update KBUILD_AFLAGS because many compiler
options are not valid assembler options."
> Cc: Arvind Sankar <nivedita@alum.mit.edu>
> Cc: x86@kernel.org
> Link: https://lore.kernel.org/llvm/CAK7LNATcHt7GcXZ=jMszyH=+M_LC9Qr6yeAGRCBbE6xriLxtUQ@mail.gmail.com/
> Suggested-by: Masahiro Yamada <masahiroy@kernel.org>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Regardless of the commit message:
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Additionally, I did verify that '-Wa,-mrelax-relocations=no' still shows
up in arch/x86/boot/compressed so:
Tested-by: Nathan Chancellor <nathan@kernel.org>
> ---
> Changes v1 -> v2:
> * Split off of v1 [1/3].
> * Use cc-option to update CFLAGS, as per Masahiro.
> * Add Masahiro's Suggested-by, Cc Arvind.
>
> arch/x86/boot/compressed/Makefile | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
> index 35ce1a64068b..85934204d905 100644
> --- a/arch/x86/boot/compressed/Makefile
> +++ b/arch/x86/boot/compressed/Makefile
> @@ -49,7 +49,7 @@ KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
> KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
> KBUILD_CFLAGS += -D__DISABLE_EXPORTS
> # Disable relocation relaxation in case the link is not PIE.
> -KBUILD_CFLAGS += $(call as-option,-Wa$(comma)-mrelax-relocations=no)
> +KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
> KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h
>
> # sev.c indirectly inludes inat-table.h which is generated during
> --
> 2.37.2.672.g94769d06f0-goog
>
next prev parent reply other threads:[~2022-08-31 19:41 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-31 18:44 [PATCH v2 0/5] fix debug info for asm and DEBUG_INFO_SPLIT Nick Desaulniers
2022-08-31 18:44 ` [PATCH v2 1/5] x86/boot/compressed: prefer cc-option for CFLAGS additions Nick Desaulniers
2022-08-31 19:41 ` Nathan Chancellor [this message]
2022-08-31 18:44 ` [PATCH v2 2/5] Makefile.compiler: Use KBUILD_AFLAGS for as-option Nick Desaulniers
2022-08-31 19:53 ` Nathan Chancellor
2022-09-05 9:09 ` Masahiro Yamada
2022-09-06 16:08 ` Nathan Chancellor
2022-09-07 4:14 ` Masahiro Yamada
2022-09-07 3:12 ` Nick Desaulniers
2022-09-07 4:27 ` Masahiro Yamada
2022-08-31 18:44 ` [PATCH v2 3/5] Makefile.compiler: replace cc-ifversion with compiler-specific macros Nick Desaulniers
2022-08-31 20:08 ` Nathan Chancellor
2022-09-05 6:44 ` Masahiro Yamada
2022-08-31 18:44 ` [PATCH v2 4/5] Makefile.debug: re-enable debug info for .S files Nick Desaulniers
2022-08-31 20:22 ` Nathan Chancellor
2022-09-05 7:49 ` Masahiro Yamada
2022-09-07 4:27 ` Nick Desaulniers
2022-08-31 18:44 ` [PATCH v2 5/5] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT Nick Desaulniers
2022-08-31 20:23 ` Nathan Chancellor
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