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From: Kurt Kanzenbach <kurt@linutronix.de>
To: Joseph Myers <joseph@codesourcery.com>
Cc: libc-alpha@sourceware.org, Florian Weimer <fweimer@redhat.com>,
 Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Thomas Gleixner
 <tglx@linutronix.de>
Subject: Re: [PATCH RFC 3/3] nptl: Include CLOCK_MONOTONIC in mutex tests
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References: <20210621111650.1164689-1-kurt@linutronix.de>
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Date: Tue, 22 Jun 2021 10:58:06 +0200
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On Mon Jun 21 2021, Joseph Myers wrote:
> On Mon, 21 Jun 2021, Kurt Kanzenbach via Libc-alpha wrote:
>
>> diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sy=
sv/linux/kernel-features.h
>> index 1680b10ca1b6..eb5c4d5a04bd 100644
>> --- a/sysdeps/unix/sysv/linux/kernel-features.h
>> +++ b/sysdeps/unix/sysv/linux/kernel-features.h
>> @@ -218,4 +218,12 @@
>>  # define __ASSUME_FACCESSAT2 0
>>  #endif
>>=20=20
>> +/* The FUTEX_LOCK_PI2 operation was introduced across all architectures=
 in Linux
>> +   5.14.  */
>> +#if __LINUX_KERNEL_VERSION >=3D 0x051400
>
> 0x051400 is 5.20.0, not 5.14.0.

OK.

>
> I'd expect this change to appear in an earlier patch, with=20
> __ASSUME_FUTEX_LOCK_PI2 conditionals being used to disable fallback=20
> support for kernels found at runtime not to support the new feature.

Yes, understood.

Thanks,
Kurt

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