Messages in this thread |  | | Subject | Re: [PATCH] selftests: remove obsolete kconfig fragment for cpu-hotplug | From | lyang0 <> | Date | Fri, 3 Nov 2017 15:34:31 +0800 |
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On 2017年11月03日 11:55, Sumit Semwal wrote: > Hello Lei, > > On 2 November 2017 at 07:43, lyang0 <lei.yang@windriver.com> wrote: >> >> On 2017年11月02日 06:59, Shuah Khan wrote: >>> On 11/01/2017 04:52 PM, Thomas Gleixner wrote: >>>> On Wed, 1 Nov 2017, Shuah Khan wrote: >>>>> On 10/17/2017 08:10 PM, lei.yang@windriver.com wrote: >>>>>> From: Lei Yang <Lei.Yang@windriver.com> >>>>>> >>>>>> Kconfig CONFIG_CPU_NOTIFIER_ERROR_INJECT has been removed since kernel >>>>>> 4.10 >>>>>> check commit: >>>>>> commit 530e9b76ae8f863dfdef4a6ad0b38613d32e8c3f >>>>>> Author: Thomas Gleixner <tglx@linutronix.de> >>>>>> Date: Wed Dec 21 20:19:53 2016 +0100 >>>>>> >>>>>> cpu/hotplug: Remove obsolete cpu hotplug register/unregister >>>>>> functions >>>>>> >>>>>> hotcpu_notifier(), cpu_notifier(), __hotcpu_notifier(), >>>>>> __cpu_notifier(), >>>>>> register_hotcpu_notifier(), register_cpu_notifier(), >>>>>> __register_hotcpu_notifier(), __register_cpu_notifier(), >>>>>> unregister_hotcpu_notifier(), unregister_cpu_notifier(), >>>>>> __unregister_hotcpu_notifier(), __unregister_cpu_notifier() >>>>>> <snip> >>>>>> >>>>>> Signed-off-by: Lei Yang <Lei.Yang@windriver.com> >>>>>> --- >>>>>> tools/testing/selftests/cpu-hotplug/config | 1 - >>>>>> 1 file changed, 1 deletion(-) >>>>>> >>>>>> diff --git a/tools/testing/selftests/cpu-hotplug/config >>>>>> b/tools/testing/selftests/cpu-hotplug/config >>>>>> index e6ab090..d4aca2a 100644 >>>>>> --- a/tools/testing/selftests/cpu-hotplug/config >>>>>> +++ b/tools/testing/selftests/cpu-hotplug/config >>>>>> @@ -1,2 +1 @@ >>>>>> CONFIG_NOTIFIER_ERROR_INJECTION=y >>>>>> -CONFIG_CPU_NOTIFIER_ERROR_INJECT=m >>>>>> >>>>> Yes. It is removed from the kernel. However, selftests from the latest >>>>> release do get run routinely on older stable releases. Dropping the >>>>> config will impact coverage on older releases. >>>>> >>>>> Thomas/Greg, >>>>> >>>>> Any ideas on what we should do about this. On one hand it is a good idea >>>>> to remove it, however my concern is coverage on older releases. >>>> Can you check the kernel version on which you are running and do it >>>> runtime >>>> conditionally? >>>> >>> I have been avoiding adding kernel version checks to tests. Maybe this is >>> one exception since the functionality is obsoleted. >> >> >> I think the baseline is that we only assure kselftest works on the release >> it belongs to, for example, removing this config for the >> version above 4.10, keep it in old release. but looks it doesn't work like >> this way. >> >> I think We can't assure latest kselftest works still well on a very older >> releases >> yes, for some features it's common for each release. but we have some >> features that are only available in newer >> release. even for the common features, it's difficult to make sure it >> still works well for each >> release. maintenance is a big effort if we use something like version check. >> you never know what changes will make >> for general feature in the future release although it's common right now. > As Greg and several others have reiterated - the tests should be able > to check for presence of a feature, run it if it's applicable, and > skip if it's not. It really isn't about kernel version check, but > writing code and test in such a way that tests can 'degrade > gracefully', rather than fail. There are several good examples for the > same. > > The idea of running newer tests is to gain coverage on older kernels > for features still present in them, but tests weren't available at the > time of the kernel tagging.
so we actually don't have version control for kselftest? anytime, we use the latest one
I thought we recommended use the one in 4.12 if we want to test 4.12 kernel, not to use the one in newer version
> Hope this helps clear the doubt?
I'm wondering how do you determine this patch apply to which release.
I don't understand "Dropping the config will impact coverage on older releases" , we can just don't apply it to the release older than 4.10. then the coverage doesn't drop.
Lei
>> Lei >> >> >>> In any case, just removing the config isn't the complete solution. I will >>> have to think about this some. >>> >>> thanks, >>> -- Shuah >>> >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-kselftest" >>> in >>> the body of a message to majordomo@vger.kernel.org >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > Best, > Sumit. > -- > To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
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