Re: linux-next: Tree for Nov 19 (kcsan)

[Marco Elver]

On Tue, 19 Nov 2019 at 16:11, Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
>
> On 11/19/19 12:46 AM, Stephen Rothwell wrote:
> > Hi all,
> >
> > Changes since 20191118:
> >
>
> on x86_64:
>
> It seems that this function can already be known by the compiler as a
> builtin:
>
> ../kernel/kcsan/core.c:619:6: warning: conflicting types for built-in function â__tsan_func_exitâ [-Wbuiltin-declaration-mismatch]
>  void __tsan_func_exit(void)
>       ^~~~~~~~~~~~~~~~
>
>
> $ gcc --version
> gcc (SUSE Linux) 7.4.1 20190905 [gcc-7-branch revision 275407]

Interesting. Could you share the .config? So far I haven't been able
to reproduce.

I can get the warning if I manually add -fsanitize=thread to flags for
kcsan/core.c (but normally disabled via KCSAN_SANITIZE := n). If
possible could you also share the output of `make V=1` for
kcsan/core.c?

Thanks,
-- Marco

> --
> ~Randy
> Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>