linux-kernel - Re: [PATCH 1/3] scsi: 3ware: fix 32-bit time calculations

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Message-ID: <yq1wp2kmiub.fsf@oracle.com>
Date:   Mon, 20 Nov 2017 22:06:04 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Adam Radford <aradford@...il.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] scsi: 3ware: fix 32-bit time calculations


Arnd,

> twl_aen_queue_event/twa_aen_queue_event, we use do_gettimeofday()
> to read the lower 32 bits of the current time in seconds, to pass
> them to the TW_IOCTL_GET_NEXT_EVENT ioctl or the 3ware_aen_read
> sysfs file.
>
> This will overflow on all architectures in year 2106, there is
> not much we can do about that without breaking the ABI. User
> space has 90 years to learn to deal with it, so it's probably ok.
>
> I'm changing it to use ktime_get_real_seconds() with a comment
> to document what happens when.

Applied to 4.16/scsi-queue.

-- 
Martin K. Petersen	Oracle Linux Engineering