Re: mm/kasan/init.c:282:20: error: redefinition of 'kasan_populate_early_vm_area_shadow'

[Kefeng Wang]

On 2021/10/12 4:53, Andrew Morton wrote:
> On Mon, 11 Oct 2021 18:12:44 +0530 Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote:
>
> > + Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> >
> > On Mon, 11 Oct 2021 at 17:08, Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote:
> > > Regression found on x86_64 gcc-11 built with KASAN enabled.
> > > Following build warnings / errors reported on linux next 20211011.
> > >
> > > metadata:
> > >      git_describe: next-20211011
> > >      git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
> > >      git_short_log: d3134eb5de85 (\"Add linux-next specific files for 20211011\")
> > >      target_arch: x86_64
> > >      toolchain: gcc-11
> > >
> > > build error :
> > > --------------
> > > mm/kasan/init.c:282:20: error: redefinition of
> > > 'kasan_populate_early_vm_area_shadow'
> > >    282 | void __init __weak kasan_populate_early_vm_area_shadow(void *start,
> > >        |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > In file included from include/linux/mm.h:34,
> > >                   from include/linux/memblock.h:13,
> > >                   from mm/kasan/init.c:9:
> > > include/linux/kasan.h:463:20: note: previous definition of
> > > 'kasan_populate_early_vm_area_shadow' with type 'void(void *, long
> > > unsigned int)'
> > >    463 | static inline void kasan_populate_early_vm_area_shadow(void *start,
> > >        |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > make[3]: *** [scripts/Makefile.build:288: mm/kasan/init.o] Error 1
> > > make[3]: Target '__build' not remade because of errors.
> > >
> > >
> > > Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
> > >
> > > build link:
> > > -----------
> > > https://builds.tuxbuild.com/1zLv2snHfZN8QV01yA9MB8NhUZt/build.log
> > >
> > > build config:
> > > -------------
> > > https://builds.tuxbuild.com/1zLv2snHfZN8QV01yA9MB8NhUZt/config
> > >
> > > # To install tuxmake on your system globally
> > > # sudo pip3 install -U tuxmake
> > > tuxmake --runtime podman --target-arch x86_64 --toolchain gcc-11
> > > --kconfig defconfig --kconfig-add
> > > https://builds.tuxbuild.com/1zLv2snHfZN8QV01yA9MB8NhUZt/config
>
> Presumably "kasan: arm64: fix pcpu_page_first_chunk crash with
> KASAN_VMALLOC".  Let's cc Kefeng.

Yes, I send a fix patch, and reply this mail, see
https://lore.kernel.org/linux-mm/5077aa7e-0167-33b6-35f0-0ea7df8f2375@xxxxxxxxxx/

> .