linux-kernel - RE: [PATCH] infiniband: cxgb4: use ktime

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Date:   Mon, 11 Dec 2017 17:02:36 -0600
From:   "Steve Wise" <swise@...ngridcomputing.com>
To:     "'Jason Gunthorpe'" <jgg@...pe.ca>,
        "'Arnd Bergmann'" <arnd@...db.de>
Cc:     "'Steve Wise'" <swise@...lsio.com>,
        "'Doug Ledford'" <dledford@...hat.com>,
        "'Bharat Potnuri'" <bharat@...lsio.com>,
        "'Leon Romanovsky'" <leon@...nel.org>,
        "'Ganesh Goudar'" <ganeshgr@...lsio.com>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] infiniband: cxgb4: use ktime_get for timestamps

> Subject: Re: [PATCH] infiniband: cxgb4: use ktime_get for timestamps
> 
> On Mon, Nov 27, 2017 at 12:44:53PM +0100, Arnd Bergmann wrote:
> > The debugfs file prints the difference between host timestamps as a
> > seconds/nanoseconds tuple, along with a 64-bit nanoseconds hardware
> > timestamp. The host time is read using getnstimeofday() which is
> > deprecated because of the y2038 overflow, and it suffers from time jumps
> > during settimeofday() and leap seconds.
> >
> > Converting to ktime_get_ts64() would solve those two, but I'm going
> > a little further here by changing to ktime_get() and printing 64-bit
> > nanoseconds on both host and hw timestamps.  This simplifies the code
> > further and makes the output easier to understand.
> >
> > The format of the debugfs file obviously changes here, but this should
> > only be read by humans and not scripts, so I assume it's fine.
> >
> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >  drivers/infiniband/hw/cxgb4/device.c   | 34
+++++++++++++++-------------------
> >  drivers/infiniband/hw/cxgb4/iw_cxgb4.h |  4 ++--
> >  drivers/infiniband/hw/cxgb4/qp.c       |  6 +++---
> >  drivers/infiniband/hw/cxgb4/t4.h       |  4 ++--
> >  4 files changed, 22 insertions(+), 26 deletions(-)
> 
> Steve? This changes the format of the debugfs files, so please ack it
> if it is Ok..
> 

I apologize for missing this patch initially.  I think this is fine.

Acked-by: Steve Wise <swise@...ngridcomputing.com>



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