linux-kernel - Re: [PATCH v8 8/8] powerpc/vdso: Provide __kernel_clock

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Date:   Sat, 9 May 2020 17:54:25 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Andy Lutomirski <luto@...nel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v8 8/8] powerpc/vdso: Provide __kernel_clock_gettime64()
 on vdso32



Le 28/04/2020 à 18:05, Arnd Bergmann a écrit :
> On Tue, Apr 28, 2020 at 3:16 PM Christophe Leroy
> <christophe.leroy@....fr> wrote:
>>
>> Provides __kernel_clock_gettime64() on vdso32. This is the
>> 64 bits version of __kernel_clock_gettime() which is
>> y2038 compliant.
>>
>> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> 
> Looks good to me
> 
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> 
> There was a bug on ARM for the corresponding function, so far it is unclear
> if this was a problem related to particular hardware, the 32-bit kernel code,
> or the common implementation of clock_gettime64 in the vdso library,
> see https://github.com/richfelker/musl-cross-make/issues/96
> 
> Just to be sure that powerpc is not affected by the same issue, can you
> confirm that repeatedly calling clock_gettime64 on powerpc32, alternating
> between vdso and syscall, results in monotically increasing times?
> 

I think that's one of the things vdsotest checks, so yes that's ok I think.

Christophe