Commit-ID: 3acf4be235280f14d838581a750532219d67facc Gitweb: https://git.kernel.org/tip/3acf4be235280f14d838581a750532219d67facc Author: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> AuthorDate: Wed, 26 Jun 2019 12:36:32 +0100 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Wed, 26 Jun 2019 14:26:55 +0200 arm64: vdso: Fix compilation with clang older than 8 clang versions older than 8 do not support -mcmodel=tiny. Add a check to the vDSO Makefile for arm64 to remove the flag when these versions of the compiler are detected. Reported-by: Qian Cai <cai@xxxxxx> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Tested-by: Qian Cai <cai@xxxxxx> Cc: linux-arch@xxxxxxxxxxxxxxx Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx Cc: linux-mips@xxxxxxxxxxxxxxx Cc: linux-kselftest@xxxxxxxxxxxxxxx Cc: catalin.marinas@xxxxxxx Cc: will.deacon@xxxxxxx Cc: arnd@xxxxxxxx Cc: linux@xxxxxxxxxxxxxxx Cc: ralf@xxxxxxxxxxxxxx Cc: paul.burton@xxxxxxxx Cc: daniel.lezcano@xxxxxxxxxx Cc: salyzyn@xxxxxxxxxxx Cc: pcc@xxxxxxxxxx Cc: shuah@xxxxxxxxxx Cc: 0x7f454c46@xxxxxxxxx Cc: linux@xxxxxxxxxxxxxxxxxx Cc: huw@xxxxxxxxxxxxxxx Cc: sthotton@xxxxxxxxxxx Cc: andre.przywara@xxxxxxx Cc: luto@xxxxxxxxxx Link: https://lkml.kernel.org/r/20190626113632.9295-1-vincenzo.frascino@xxxxxxx --- arch/arm64/kernel/vdso/Makefile | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index ec81d28aeb5d..4ab863045188 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -38,6 +38,13 @@ else CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -include $(c-gettimeofday-y) endif +# Clang versions less than 8 do not support -mcmodel=tiny +ifeq ($(CONFIG_CC_IS_CLANG), y) + ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0) + CFLAGS_REMOVE_vgettimeofday.o += -mcmodel=tiny + endif +endif + # Disable gcov profiling for VDSO code GCOV_PROFILE := n
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