Hi Qian, On 25/06/2019 14:51, Qian Cai wrote: > On Tue, 2019-06-25 at 14:40 +0100, Vincenzo Frascino wrote: >> 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? > > Compiler: clang version 7.0.1 (tags/RELEASE_701/final) >
I am using clang 8.0.0. Could you please try with it and see if the issue goes away? Thanks, Vincenzo >> >>>> >>>> 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