On 12/03/2017 02:32 PM, Sudip Mukherjee wrote:
> On Mon, Nov 27, 2017 at 10:25:16AM -0800, Vineet Gupta wrote:
>> +CC linux-arch, Arnd
>>
>> On 11/23/2017 09:17 AM, Alexey Brodkin wrote:
>>> Hi Sudip,
>>>
>>> On Tue, 2017-11-21 at 22:10 +0000, Sudip Mukherjee wrote:
>
> <snip>
>
>> I understand the case/need for adding a weak/common abort() as a
>> quick fix for handling such cases, but perhaps we should not and
>> instead fix the rootcause. In this specific case, Claudiu mentioned
>> that gcc was generating abort due to something like this (flagging a
>> possible divide by zero due to
>> -fno-isolate-erroneous-paths-dereference.
>>
>> a;
>>
>> fn1() {
>> switch (a)
>> case 0:
>> return 1 / a;
>> }
>>
>> Sudeep can you confirm that removing this hacking FRV build to not
>> have this toggle fixes the abort issue.
>>
>> So the offending code needs to be fixed as in the end when that code
>> path is taken system is hosed.
>
> The above case that you mentioned is indeed the case here.
> mpihelp_divrem() in lib/mpi/mpih-div.c has this same divide by zero case.
>
> So, what should be the actual fix here?
To remove the divide by zero.
Or atleast have a __weak abort() defined in common code so all arches benefit from
it !
-Vineet
