Messages in this thread | | | Subject | Re: "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build | From | Qian Cai <> | Date | Tue, 25 Jun 2019 09:51:45 -0400 |
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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)
> > > > > > > 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 > > > > >
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