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

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Message-ID: <f0523b3a-ea08-4615-b0fb-5b504a2d39df@sirena.org.uk>
Date: Thu, 11 Apr 2024 13:44:42 +0100
From: Mark Brown <broonie@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, 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 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)
                            ^
1 warning and 3 errors generated.

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