Messages in this thread | | | Subject | Re: "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build | From | Vincenzo Frascino <> | Date | Tue, 25 Jun 2019 14:40:38 +0100 |
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Hi Qin,
On 25/06/2019 13:56, Qian Cai wrote: > On Tue, 2019-06-25 at 13:47 +0100, Vincenzo Frascino wrote: >> Hi Qian, >> >> On 25/06/2019 13:16, Qian Cai wrote: >>> The linux-next commit "arm64: vdso: Substitute gettimeofday() with C >>> implementation" [1] breaks clang build. >>> >>> error: invalid value 'tiny' in '-mcode-model tiny' >>> make[1]: *** [scripts/Makefile.build:279: >>> arch/arm64/kernel/vdso/vgettimeofday.o] Error 1 >>> make[1]: *** Waiting for unfinished jobs.... >>> make: *** [arch/arm64/Makefile:180: vdso_prepare] Error 2 >>> >>> [1] https://patchwork.kernel.org/patch/11009663/ >>> >> >> I am not sure what does exactly break from your report. Could you please >> provide >> more details? > > Here is the config to reproduce. > > https://raw.githubusercontent.com/cailca/linux-mm/master/arm64.config > > # make CC=clang -j $(nr_cpus) > > I can get it working again by removing "-mcmodel=tiny" in > arch/arm64/kernel/vdso/Makefile >
With your defconfig I can't still reproduce the problem. Which version of clang are you using?
>> >> On my env: >> >> $ make mrproper && make defconfig && make CC=clang HOSTCC=clang -j$(nproc) >> >> ... >> >> arch/arm64/Makefile:56: CROSS_COMPILE_COMPAT is clang, the compat vDSO will >> not >> be built >> >> ... >> >> LDS arch/arm64/kernel/vdso/vdso.lds >> AS arch/arm64/kernel/vdso/note.o >> AS arch/arm64/kernel/vdso/sigreturn.o >> CC arch/arm64/kernel/vdso/vgettimeofday.o >> LD arch/arm64/kernel/vdso/vdso.so.dbg >> VDSOCHK arch/arm64/kernel/vdso/vdso.so.dbg >> VDSOSYM include/generated/vdso-offsets.h >> >> ... >> >> LD vmlinux.o >> MODPOST vmlinux.o >> MODINFO modules.builtin.modinfo >> KSYM .tmp_kallsyms1.o >> KSYM .tmp_kallsyms2.o >> LD vmlinux >> SORTEX vmlinux >> SYSMAP System.map >> Building modules, stage 2. >> OBJCOPY arch/arm64/boot/Image >> MODPOST 483 modules >>
-- Regards, Vincenzo
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