Patch "kbuild: check CONFIG_AS_IS_LLVM instead of LLVM_IAS" has been added to the 5.10-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    kbuild: check CONFIG_AS_IS_LLVM instead of LLVM_IAS

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kbuild-check-config_as_is_llvm-instead-of-llvm_ias.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From stable-owner@vger.kernel.org Wed Mar 29 02:08:43 2023
From: Nathan Chancellor <nathan@kernel.org>
Date: Tue, 28 Mar 2023 17:08:31 -0700
Subject: kbuild: check CONFIG_AS_IS_LLVM instead of LLVM_IAS
To: gregkh@linuxfoundation.org, sashal@kernel.org
Cc: conor@kernel.org, stable@vger.kernel.org, llvm@lists.linux.dev, Masahiro Yamada <masahiroy@kernel.org>, Nick Desaulniers <ndesaulniers@google.com>, Nathan Chancellor <nathan@kernel.org>
Message-ID: <20230328-riscv-zifencei-zicsr-5-10-v1-3-bccb3e16dc46@kernel.org>

From: Masahiro Yamada <masahiroy@kernel.org>

commit 52cc02b910284d6bddba46cce402044ab775f314 upstream.

LLVM_IAS is the user interface to set the -(no-)integrated-as flag,
and it should be used only for that purpose.

LLVM_IAS is checked in some places to determine the assembler type,
but it is not precise.

For example,

 $ make CC=gcc LLVM_IAS=1

... will use the GNU assembler (i.e. binutils) since LLVM_IAS=1 is
effective only when $(CC) is clang.

Of course, 'CC=gcc LLVM_IAS=1' is an odd combination, but the build
system can be more robust against such insane input.

Commit ba64beb17493a ("kbuild: check the minimum assembler version in
Kconfig") introduced CONFIG_AS_IS_GNU/LLVM, which is more precise
because Kconfig checks the version string from the assembler in use.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
[nathan: Backport to 5.10]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 Makefile            |    2 +-
 arch/riscv/Makefile |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/Makefile
+++ b/Makefile
@@ -851,7 +851,7 @@ else
 DEBUG_CFLAGS	+= -g
 endif
 
-ifeq ($(LLVM_IAS),1)
+ifdef CONFIG_AS_IS_LLVM
 KBUILD_AFLAGS	+= -g
 else
 KBUILD_AFLAGS	+= -Wa,-gdwarf-2
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -40,7 +40,7 @@ ifeq ($(CONFIG_LD_IS_LLD),y)
 ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 150000; echo $$?),0)
 	KBUILD_CFLAGS += -mno-relax
 	KBUILD_AFLAGS += -mno-relax
-ifneq ($(LLVM_IAS),1)
+ifndef CONFIG_AS_IS_LLVM
 	KBUILD_CFLAGS += -Wa,-mno-relax
 	KBUILD_AFLAGS += -Wa,-mno-relax
 endif


Patches currently in stable-queue which might be from stable-owner@vger.kernel.org are

queue-5.10/kbuild-check-the-minimum-assembler-version-in-kconfig.patch
queue-5.10/cgroup-cpuset-make-cpuset_fork-handle-clone_into_cgroup-properly.patch
queue-5.10/kbuild-check-config_as_is_llvm-instead-of-llvm_ias.patch
queue-5.10/riscv-handle-zicsr-zifencei-issues-between-clang-and-binutils.patch
queue-5.10/kbuild-switch-to-f-variants-of-integrated-assembler-flag.patch
queue-5.10/cgroup-cpuset-add-cpuset_can_fork-and-cpuset_cancel_fork-methods.patch
queue-5.10/cgroup-cpuset-change-references-of-cpuset_mutex-to-cpuset_rwsem.patch
queue-5.10/cgroup-cpuset-skip-spread-flags-update-on-v2.patch