linux-kernel - Re: [Outreachy kernel] [PATCH v2] firewire: Replace timeval with timespec64

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Date:	Thu, 5 Nov 2015 14:34:48 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Arnd Bergmann <arnd@...db.de>,
	Amitoj Kaur Chawla <amitoj1606@...il.com>
Cc:	outreachy-kernel@...glegroups.com,
	linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, y2038@...ts.linaro.org
Subject: Re: [Outreachy kernel] [PATCH v2] firewire: Replace timeval with
 timespec64

On Oct 22 Arnd Bergmann wrote:
> On Thursday 22 October 2015 04:05:00 Amitoj Kaur Chawla wrote:
> > 32 bit systems using 'struct timeval' will break in the year 2038, so
> > we replace the code appropriately. However, this driver is not broken
> > in 2038 since we are using only the microseconds portion of the
> > current time.
> > 
> > This patch replaces timeval with timespec64.
> > 
> > Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
> 
> Reviewed-by: Arnd Bergmann <arnd@...db.de>
> 
> (adding the y2038 mailing list as well)

Committed to linux1394.git.
Arnd, do you have special y2038 plans that make it desirable to have this
merged before v4.4?  Otherwise I would submit it for v4.5-rc1.

> > Changes in v2:
> >         -Replaced timespec with timspec64
> >         -Modified commit message
> >         -Used ktime_get_real_ts64() instead of getnstimeofday64()
> > 
> >  drivers/firewire/nosy.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c
> > index 76b2d39..8a46077 100644
> > --- a/drivers/firewire/nosy.c
> > +++ b/drivers/firewire/nosy.c
> > @@ -33,6 +33,7 @@
> >  #include <linux/sched.h> /* required for linux/wait.h */
> >  #include <linux/slab.h>
> >  #include <linux/spinlock.h>
> > +#include <linux/time64.h>
> >  #include <linux/timex.h>
> >  #include <linux/uaccess.h>
> >  #include <linux/wait.h>
> > @@ -413,17 +414,18 @@ static void
> >  packet_irq_handler(struct pcilynx *lynx)
> >  {
> >  	struct client *client;
> > -	u32 tcode_mask, tcode;
> > +	u32 tcode_mask, tcode, timestamp;
> >  	size_t length;
> > -	struct timeval tv;
> > +	struct timespec64 ts64;
> >  
> >  	/* FIXME: Also report rcv_speed. */
> >  
> >  	length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
> >  	tcode  = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
> >  
> > -	do_gettimeofday(&tv);
> > -	lynx->rcv_buffer[0] = (__force __le32)tv.tv_usec;
> > +	ktime_get_real_ts64(&ts64);
> > +	timestamp = ts64.tv_nsec / NSEC_PER_USEC;
> > +	lynx->rcv_buffer[0] = (__force __le32)timestamp;
> >  
> >  	if (length == PHY_PACKET_SIZE)
> >  		tcode_mask = 1 << TCODE_PHY_PACKET;
> > 
> 

-- 
Stefan Richter
-=====-===== =-== --=-=
http://arcgraph.de/sr/

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