linux-kernel - [PATCH v4 3/4] ARM: only use -mtp=cp15 for the compiler

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Message-ID: <20221014201354.3190007-4-ndesaulniers@google.com>
Date:   Fri, 14 Oct 2022 13:13:53 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Russell King <rmk+kernel@...linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>, Ard Biesheuvel <ardb@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH v4 3/4] ARM: only use -mtp=cp15 for the compiler

Avoids an error from the assembler for CONFIG_THUMB2 kernels:

clang-15: error: hardware TLS register is not supported for the thumbv4t
sub-architecture

This flag only makes sense to pass to the compiler, not the assembler.

Perhaps CFLAGS_ABI can be renamed to CPPFLAGS_ABI to reflect that they
will be passed to both the compiler and assembler for sources that
require pre-processing.

Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 arch/arm/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 8dd943b50b7d..ee888070b2ff 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -111,7 +111,7 @@ CFLAGS_ABI	+= -meabi gnu
 endif
 
 ifeq ($(CONFIG_CURRENT_POINTER_IN_TPIDRURO),y)
-CFLAGS_ABI	+= -mtp=cp15
+KBUILD_CFLAGS	+= -mtp=cp15
 endif
 
 # Accept old syntax despite ".syntax unified"
-- 
2.38.0.413.g74048e4d9e-goog