linux-kernel - Re: [PATCH] [v2] scsi: ips: fix firmware timestamps for 32-bit

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Message-ID: <yq1wox1fnz0.fsf@oracle.com>
Date:   Fri, 20 Apr 2018 19:38:11 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Finn Thain <fthain@...egraphics.com.au>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] scsi: ips: fix firmware timestamps for 32-bit


Arnd,

> do_gettimeofday() is deprecated since it will stop working in 2038 on
> 32-bit platforms, leading to incorrect times passed to the firmware.
> On 64-bit platforms the current code appears to be fine, as the
> calculation passes an 8-bit century number into the firmware that can
> represent times long in the future (possibly until 25599).
>
> Using ktime_get_real_seconds() to get a 64-bit seconds value and
> time64_to_tm() to convert it into the firmware format greatly
> simplifies the ips timekeeping code, makes 32-bit and 64-bit behave
> the same way here, and gets us closer to removing the deprecated
> interfaces.

Applied to 4.18/scsi-queue, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering