linux-kernel - Re: [PATCH] scsi: libfc: fix seconds_since_last

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Message-ID: <3671744.A3ustGCdmM@wuerfel>
Date:	Mon, 20 Jun 2016 16:50:01 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Bart Van Assche <bart.vanassche@...disk.com>
Cc:	Vasu Dev <vasu.dev@...el.com>,
	"James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	y2038@...ts.linaro.org, fcoe-devel@...n-fcoe.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: libfc: fix seconds_since_last_reset calculation

On Monday, June 20, 2016 3:54:06 PM CEST Bart Van Assche wrote:
> On 06/17/2016 05:47 PM, Arnd Bergmann wrote:
> > -     jiffies_to_timespec(jiffies, &v0);
> > -     jiffies_to_timespec(lport->boot_time, &v1);
> > -     fc_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
> > +     fc_stats->seconds_since_last_reset = (lport->boot_time - jiffies) / HZ;
> 
> Does this patch introduce a 64-bit division? There might still be 32-bit 
> users of this code.

No, both lport->boot_time and jiffies are 'unsigned long'.

	Arnd