linux-kernel - Re: [PATCH] selftests/timers/posix_timers: reimplement check_timer

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Message-ID: <87il0o0yrc.ffs@tglx>
Date: Thu, 11 Apr 2024 16:17:43 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Mark Brown <broonie@...nel.org>, Oleg Nesterov <oleg@...hat.com>
Cc: John Stultz <jstultz@...gle.com>, Marco Elver <elver@...gle.com>, Peter
 Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, "Eric W.
 Biederman" <ebiederm@...ssion.com>, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
 kasan-dev@...glegroups.com, Edward Liaw <edliaw@...gle.com>, Carlos Llamas
 <cmllamas@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] selftests/timers/posix_timers: reimplement
 check_timer_distribution()

On Thu, Apr 11 2024 at 13:44, Mark Brown wrote:
> On Sat, Apr 06, 2024 at 05:09:51PM +0200, Oleg Nesterov wrote:
>> Thomas says:
>> 
>> 	The signal distribution test has a tendency to hang for a long
>> 	time as the signal delivery is not really evenly distributed. In
>> 	fact it might never be distributed across all threads ever in
>> 	the way it is written.
>> 
>> To me even the
>> 
>> 	This primarily tests that the kernel does not favour any one.
>
> Further to my previous mail it's also broken the arm64 selftest builds,
> they use kselftest.h with nolibc in order to test low level
> functionality mainly used by libc implementations and nolibc doesn't
> implement uname():
>
> In file included from za-fork.c:12:
> ../../kselftest.h:433:17: error: variable has incomplete type 'struct utsname'
>         struct utsname info;
>                        ^
> ../../kselftest.h:433:9: note: forward declaration of 'struct utsname'
>         struct utsname info;
>                ^
> ../../kselftest.h:435:6: error: call to undeclared function 'uname'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>         if (uname(&info) || sscanf(info.release, "%u.%u.", &major, &minor) != 2)
>             ^
> ../../kselftest.h:435:22: error: call to undeclared function 'sscanf'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>         if (uname(&info) || sscanf(info.release, "%u.%u.", &major, &minor) != 2)

Grrr. Let me stare at this.