lkml.org 
[lkml]   [2020]   [May]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 0/4] kselftest: Extend vDSO tests
From
Date
Hi Arnd,

On 5/5/20 3:50 PM, Arnd Bergmann wrote:
> On Wed, Apr 29, 2020 at 1:34 PM Vincenzo Frascino
> <vincenzo.frascino@arm.com> wrote:
>>
>> This series extends the kselftests for the vDSO library making sure: that
>> they compile correctly on non x86 platforms, that they can be cross
>> compiled and introducing new tests that verify the correctness of the
>> library.
>>
>> The so extended vDSO kselftests have been verified on all the platforms
>> supported by the unified vDSO library [1].
>>
>> The only new patch that this series introduces is the first one, patch 2 and
>> patch 3 have already been reviewed in past as part of other series [2] [3].
>>
>> [1] https://lore.kernel.org/lkml/20190621095252.32307-1-vincenzo.frascino@arm.com
>> [2] https://lore.kernel.org/lkml/20190621095252.32307-26-vincenzo.frascino@arm.com
>> [3] https://lore.kernel.org/lkml/20190523112116.19233-4-vincenzo.frascino@arm.com
>
> Hi Vincenzo,
>
> Not sure if you are aware of the recent bug report about clock_gettime64()
> returning invalid times on some arm32 kernels:
> https://github.com/raspberrypi/linux/issues/3579
>

No, I was not aware of the problem. There has been no mention on the arm list
(unless I missed it). I can try to have a look at it as soon as I get some time.

> Regardless of when that gets fixed or by whom, I wonder if kselftest should
> also check for consistency, i.e. call both the vdso and the syscall version of
> clock_gettime() and clock_gettime64() and check that the results are always
> in sequence.
>

The test #4 partially does that: it calls syscall-vdso-syscall and verifies that
the sequencing is correct. I reused the x86 code for that. I could extend it to
clock_gettime64() and make sure it builds on all the platforms.

> Arnd
>

--
Regards,
Vincenzo

\
 
 \ /
  Last update: 2020-05-05 17:05    [W:0.077 / U:0.224 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site