On 12/12/2017 02:49 PM, Sudip Mukherjee wrote:
> gcc toggle -fisolate-erroneous-paths-dereference (default at -O2
> onwards) isolates faulty code paths such as null pointer access, divide
> by zero etc. If gcc port doesnt implement __builtin_trap, an abort() is
> generated which causes kernel link error.
>
> In this case, gcc is generating abort due to 'divide by zero' in
> lib/mpi/mpih-div.c.
>
> Currently 'frv' and 'arc' are failing. Previously other arch was also
> broken like m32r was fixed by d22e3d69ee1a ("m32r: fix build failure").
>
> Lets define this weak function which is common for all arch and fix the
> problem permanently. We can even remove the arch specific 'abort' after
> this is done.
>
> Cc: Alexey Brodkin <Alexey.Brodkin at synopsys.com>
> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee at gmail.com>
> ---
>
> Hi Alexey,
> I was thinking of sending the m32r revert patch in few days. My m32r
> builds are having a little problem and should be fixed by this weekend.
> I can not test m32r before that. We can also send a patch to remove the
> same code in arm and unicore32.
>
> kernel/exit.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/kernel/exit.c b/kernel/exit.c
> index af6c245..90c6869 100644
> --- a/kernel/exit.c
> +++ b/kernel/exit.c
> @@ -1759,3 +1759,11 @@ long kernel_wait4(pid_t upid, int __user *stat_addr, int options,
> return -EFAULT;
> }
> #endif
> +
> +__weak void abort(void)
> +{
> + BUG();
> +
> + /* if that doesn't kill us, halt */
> + panic("Oops failed to kill thread");
> +}
Hmm, I realize there's a small gotcha with this, when testing with a different
patch from Arnd. This needs an EXPORT_SYMBOL() as well !
-Vineet
