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| author |  Nick Desaulniers <ndesaulniers@google.com>
| 2022-10-24 20:44:41 +0100 |
|---|---|---|
| committer |  Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
| 2022-11-08 18:36:17 +0000 |
| commit | a2faac39866d0313f3ca59c36a9f4e077faf4f53 (patch) | |
| tree | dc61ac59188ca8484ce96c572abfbd0a574df274 /arch/arm/boot/compressed/Makefile | |
| parent | ARM: 9262/1: remove lazy evaluation in Makefile (diff) | |
| download | linux-a2faac39866d0313f3ca59c36a9f4e077faf4f53.tar.gz linux-a2faac39866d0313f3ca59c36a9f4e077faf4f53.tar.bz2 linux-a2faac39866d0313f3ca59c36a9f4e077faf4f53.zip | |
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/boot/compressed/Makefile')
| -rw-r--r-- | arch/arm/boot/compressed/Makefile | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile index 2cc2af13779e..8c63f0a26f56 100644 --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile @@ -164,4 +164,3 @@ $(obj)/piggy_data: $(obj)/../Image FORCE $(obj)/piggy.o: $(obj)/piggy_data CFLAGS_font.o := -Dstatic= -AFLAGS_hyp-stub.o := -Wa,-march=armv7-a |