linux-kernel - Re: [PATCH 8/8] LinuxPPS: pps_gen_parport: Add check for bad clocksource.

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Message-ID: <c46c45df-f9b5-fe97-66d5-aa9f43c4351a@enneenne.com>
Date:   Sat, 4 Mar 2017 08:44:03 +0100
From:   Rodolfo Giometti <giometti@...eenne.com>
To:     Andrey Drobyshev <immortalguardian1@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     gq@...msu.su
Subject: Re: [PATCH 8/8] LinuxPPS: pps_gen_parport: Add check for bad
 clocksource.

On 02/15/17 15:31, Andrey Drobyshev wrote:
> From: Nikita Edward Baruzdin <nebaruzdin@...il.com>
>
> This commit is supposed to resolve the issue with hard lockups on systems using
> jiffies as their clock source. Namely, it sets limits on number of iterations
> clock source may remain unchanged (i. e. not being updated for one reason or
> another, as it is with jiffies clock source), and on unsuccessful
> getnstimeofday() polls as well. In case limit is reached, we consider clock
> source incompatible with this driver or unstable.
>
> Considering this issue to be fixed, un-BROKEN pps_gen_parport.
>
> For explanation of the problem see this thread on lkml:
> https://lkml.org/lkml/2011/2/18/310
>
> Signed-off-by: Nikita Edward Baruzdin <nebaruzdin@....cs.msu.su>
> Signed-off-by: Alexander GQ Gerasiov <gq@...msu.su>

Acked-by: Rodolfo Giometti <giometti@...eenne.com>