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Re: [PATCH] powerpc: fix sysconf support for cache geometries
On 20/06/2017 18:08, Tulio Magno Quites Machado Filho wrote:
> Adhemerval Zanella <adhemerval.zanella@linaro.org> writes:
>
>> On 16/06/2017 10:36, Tulio Magno Quites Machado Filho wrote:
>>> Adhemerval Zanella <adhemerval.zanella@linaro.org> writes:
>>>
>>>> On 16/06/2017 09:00, Paul Clarke wrote:
>>>>> On 06/15/2017 03:55 PM, Adhemerval Zanella wrote:
>>>>>> On 15/06/2017 17:45, Paul Clarke wrote:
>>>>>>> Commit cdfbe5037f2f67bf5f560b73732b69d0fabe2314 added sysconf support
>>>>>>> for cache geometries on powerpc, but mishandled errno. For valid input
>>>>>>> parameters, sysconf() should not set errno.
>>>>>>
>>>>>> Do we have a testcase for it? If not I think we should add it.
>>>>>
>>>>> We don't. There are three obvious test cases for sysconf:
>>>>> - ./nptl/tst-sysconf.c: ignores errno
>>>>> - ./posix/tst-sysconf.c: ignores errno
>>>>> - ./sysdeps/unix/sysv/linux/powerpc/tst-sysconf.c
>>>>> Ironically (given the need for the subject patch), this correctly tests for errno changes but only for the _SC_LEVEL*, and only for powerpc.
>>>>
>>>> I think you might have a staged change in your repo, I do not see
>>>> the powerpc specific one in master. In any case, I think it worth
>>>> to add some errno testing on nptl and posix tests (maybe even
>>>> incorporate nptl on posix) and add powerpc one (be aware to avoid
>>>> add a testcase with same name in same folder, as this powerpc seems
>>>> to be doing).
>>>
>>> I guess Paul meant to say
>>> sysdeps/unix/sysv/linux/powerpc/test-powerpc-linux-sysconf.c, which is the
>>> new name of the test after solving the name clash issue. ;-)
>>
>> Right, so that's the one that caused some trouble in the past. We can use
>> this file to add a regression test then.
>
> I was planning to push this patch, but your last message wasn't entirely clear
> to me.
> Do you think there is something else to be done in this patch?
>
My understanding based on Paul's answer is we do not have regression tests
for the very issues this patch intend, but test-powerpc-linux-sysconf.c does
seem to have tests for errno handling (which may only be trigger in recent
kernel due underlying support). If it is the case the patch lgtm, otherwise
I think we need to add some regression tests.