diff options
author | Nick Desaulniers <ndesaulniers@google.com> | 2022-10-24 22:44:41 +0300 |
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committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-11-08 21:36:17 +0300 |
commit | a2faac39866d0313f3ca59c36a9f4e077faf4f53 (patch) | |
tree | dc61ac59188ca8484ce96c572abfbd0a574df274 /arch/arm/common/Makefile | |
parent | 5aa4860eb50f3700e3175759f608bcfb68d0d6ae (diff) | |
download | linux-a2faac39866d0313f3ca59c36a9f4e077faf4f53.tar.xz |
ARM: 9263/1: use .arch directives instead of assembler command line flags
Similar to commit a6c30873ee4a ("ARM: 8989/1: use .fpu assembler
directives instead of assembler arguments").
GCC and GNU binutils support setting the "sub arch" via -march=,
-Wa,-march, target function attribute, and .arch assembler directive.
Clang was missing support for -Wa,-march=, but this was implemented in
clang-13.
The behavior of both GCC and Clang is to
prefer -Wa,-march= over -march= for assembler and assembler-with-cpp
sources, but Clang will warn about the -march= being unused.
clang: warning: argument unused during compilation: '-march=armv6k'
[-Wunused-command-line-argument]
Since most assembler is non-conditionally assembled with one sub arch
(modulo arch/arm/delay-loop.S which conditionally is assembled as armv4
based on CONFIG_ARCH_RPC, and arch/arm/mach-at91/pm-suspend.S which is
conditionally assembled as armv7-a based on CONFIG_CPU_V7), prefer the
.arch assembler directive.
Add a few more instances found in compile testing as found by Arnd and
Nathan.
Link: https://github.com/llvm/llvm-project/commit/1d51c699b9e2ebc5bcfdbe85c74cc871426333d4
Link: https://bugs.llvm.org/show_bug.cgi?id=48894
Link: https://github.com/ClangBuiltLinux/linux/issues/1195
Link: https://github.com/ClangBuiltLinux/linux/issues/1315
Suggested-by: Arnd Bergmann <arnd@arndb.de>
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm/common/Makefile')
-rw-r--r-- | arch/arm/common/Makefile | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile index 7bae8cbaafe7..9733381074e0 100644 --- a/arch/arm/common/Makefile +++ b/arch/arm/common/Makefile @@ -13,7 +13,5 @@ obj-$(CONFIG_SHARP_SCOOP) += scoop.o obj-$(CONFIG_CPU_V7) += secure_cntvoff.o obj-$(CONFIG_MCPM) += mcpm_head.o mcpm_entry.o mcpm_platsmp.o vlock.o CFLAGS_REMOVE_mcpm_entry.o = -pg -AFLAGS_mcpm_head.o := -march=armv7-a -AFLAGS_vlock.o := -march=armv7-a obj-$(CONFIG_BL_SWITCHER) += bL_switcher.o obj-$(CONFIG_BL_SWITCHER_DUMMY_IF) += bL_switcher_dummy_if.o |