linux-kernel - Re: [PATCH vdsotest] Use vdso wrapper for gettimeofday()

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Message-ID: <87d08b8j7z.fsf@linux.ibm.com>
Date:   Mon, 13 Apr 2020 11:05:04 -0500
From:   Nathan Lynch <nathanl@...ux.ibm.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH vdsotest] Use vdso wrapper for gettimeofday()

Christophe Leroy <christophe.leroy@....fr> writes:
> Hi Nathan,
>
> Le 16/01/2020 à 17:56, Nathan Lynch a écrit :
>> Hi Christophe,
>> 
>> Christophe Leroy <christophe.leroy@....fr> writes:
>>> To properly handle errors returned by gettimeofday(), the
>>> DO_VDSO_CALL() macro has to be used, otherwise vdsotest
>>> misinterpret VDSO function return on error.
>>>
>>> This has gone unnoticed until now because the powerpc VDSO
>>> gettimeofday() always succeed, but while porting powerpc to
>>> generic C VDSO, the following has been encountered:
>> 
>> Thanks for this, I'll review it soon.
>> 
>> Can you point me to patches for the powerpc generic vdso work?
>> 
>
> I have not seen any update on the vdsotest repository, have you been 
> able to have a look at the patch ?

Thanks for the reminder. I've applied this now.