lkml.org 
[lkml]   [2019]   [Jun]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: "arm64: vdso: Substitute gettimeofday() with C implementation" breaks clang build
From
Date
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
> > >
>
>

\
 
 \ /
  Last update: 2019-06-25 15:52    [W:0.055 / U:74.504 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site