kernel_optimize_test/arch/mips/vdso
Nathan Chancellor 72cf3b3df4
MIPS: vdso: Wrap -mexplicit-relocs in cc-option
Clang does not support this option and errors out:

clang-11: error: unknown argument: '-mexplicit-relocs'

Clang does not appear to need this flag like GCC does because the jalr
check that was added in commit 976c23af3e ("mips: vdso: add build
time check that no 'jalr t9' calls left") passes just fine with

$ make ARCH=mips CC=clang CROSS_COMPILE=mipsel-linux-gnu- malta_defconfig arch/mips/vdso/

even before commit d3f703c435 ("mips: vdso: fix 'jalr t9' crash in
vdso code").

-mrelax-pic-calls has been supported since clang 9, which is the
earliest version that could build a working MIPS kernel, and it is the
default for clang so just leave it be.

Fixes: d3f703c435 ("mips: vdso: fix 'jalr t9' crash in vdso code")
Link: https://github.com/ClangBuiltLinux/linux/issues/890
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: clang-built-linux@googlegroups.com
2020-02-19 10:30:10 -08:00
..
.gitignore MIPS: Initial implementation of a VDSO 2015-11-11 08:36:36 +01:00
config-n32-o32-env.c mips: compat: vdso: Use legacy syscalls as fallback 2019-09-03 15:35:23 +01:00
elf.S mips: Add support for generic vDSO 2019-07-25 21:45:05 -07:00
genvdso.c mips/vdso: Support mremap() for vDSO 2020-01-15 10:44:14 -08:00
genvdso.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
Makefile MIPS: vdso: Wrap -mexplicit-relocs in cc-option 2020-02-19 10:30:10 -08:00
sigreturn.S mips: Add support for generic vDSO 2019-07-25 21:45:05 -07:00
vdso.lds.S mips: Add clock_gettime64 entry point 2019-07-25 21:45:52 -07:00
vgettimeofday.c mips: Fix gettimeofday() in the vdso library 2019-12-02 10:50:37 -08:00