linux-kernel - [PATCH] ARM: Drop '-mthumb' from AFLAGS

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Message-Id: <20221114225719.1657174-1-nathan@kernel.org>
Date:   Mon, 14 Nov 2022 15:57:20 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Russell King <linux@...linux.org.uk>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Ard Biesheuvel <ardb@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, patches@...ts.linux.dev,
        Nathan Chancellor <nathan@...nel.org>,
        "kernelci.org bot" <bot@...nelci.org>
Subject: [PATCH] ARM: Drop '-mthumb' from AFLAGS_ISA

When building with CONFIG_THUMB2_KERNEL=y + a version of clang from
Debian, the following warning occurs frequently:

  <built-in>:383:9: warning: '__thumb2__' macro redefined [-Wmacro-redefined]
  #define __thumb2__ 2
          ^
  <built-in>:353:9: note: previous definition is here
  #define __thumb2__ 1
          ^
  1 warning generated.

Debian carries a downstream patch that changes the default CPU of the
arm-linux-gnueabihf target from 'arm1176jzf-s' (v6) to 'cortex-a7' (v7).
As a result, '-mthumb' defines both '__thumb__' and '__thumb2__'. The
define of '__thumb2__' via the command line was purposefully added to
catch a situation like this.

In a similar vein as commit 26b12e084bce ("ARM: 9264/1: only use
-mtp=cp15 for the compiler"), do not add '-mthumb' to AFLAGS_ISA, as it
is already passed to the assembler via '-Wa,-mthumb' and '__thumb2__' is
already defined for preprocessing.

Fixes: 1d2e9b67b001 ("ARM: 9265/1: pass -march= only to compiler")
Link: htps://salsa.debian.org/pkg-llvm-team/llvm-toolchain/-/blob/17354b030ac4252ff6c5e9d01f4eba28bd406b2d/debian/patches/930008-arm.diff
Reported-by: "kernelci.org bot" <bot@...nelci.org>
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 arch/arm/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 357f0d9b8607..d1ebb746ff40 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -131,8 +131,9 @@ endif
 AFLAGS_NOWARN	:=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W)
 
 ifeq ($(CONFIG_THUMB2_KERNEL),y)
-CFLAGS_ISA	:=-mthumb -Wa,-mimplicit-it=always $(AFLAGS_NOWARN)
+CFLAGS_ISA	:=-Wa,-mimplicit-it=always $(AFLAGS_NOWARN)
 AFLAGS_ISA	:=$(CFLAGS_ISA) -Wa$(comma)-mthumb -D__thumb2__=2
+CFLAGS_ISA	+=-mthumb
 else
 CFLAGS_ISA	:=$(call cc-option,-marm,) $(AFLAGS_NOWARN)
 AFLAGS_ISA	:=$(CFLAGS_ISA)

base-commit: 0c52591d22e99759da3793f19249bbf45ad742bd
-- 
2.38.1