WSL2-Linux-Kernel/arch/arm/common
Nick Desaulniers a2faac3986 ARM: 9263/1: use .arch directives instead of assembler command line flags
Similar to commit a6c30873ee ("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: 1d51c699b9
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>
2022-11-08 18:36:17 +00:00
..
Kconfig ARM/dma-mapping: remove dmabounce 2022-07-07 18:18:56 +02:00
Makefile ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
bL_switcher.c sched,bL_switcher: Convert to sched_set_fifo*() 2020-06-15 14:10:20 +02:00
bL_switcher_dummy_if.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
firmware.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
krait-l2-accessors.c ARM: Add Krait L2 register accessor functions 2018-10-17 13:14:33 -07:00
locomo.c ARM: pxa: split up mach/hardware.h 2022-04-19 16:27:05 +02:00
mcpm_entry.c docs: arm: convert docs to ReST and rename to *.rst 2019-07-15 09:20:24 -03:00
mcpm_head.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
mcpm_platsmp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
sa1111.c ARM: sa1100/assabet: move dmabounce hack to ohci driver 2022-07-07 18:18:47 +02:00
scoop.c ARM: 9123/1: scoop: Drop if with an always false condition 2021-10-19 10:30:54 +01:00
secure_cntvoff.S ARM: smp: Add initialization of CNTVOFF 2018-05-08 14:50:42 +02:00
sharpsl_param.c ARM: sharpsl_param: work around -Wstringop-overread warning 2021-10-05 15:44:56 +02:00
vlock.S ARM: 9263/1: use .arch directives instead of assembler command line flags 2022-11-08 18:36:17 +00:00
vlock.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00