linux-kernel - Re: [PATCH net-next V3 10/23] ptp: e1000e: convert to the 64 bit get/set time methods.

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Message-ID: <20150331214815.GA9233@localhost.localdomain>
Date:	Tue, 31 Mar 2015 23:48:15 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Amir Vadai <amirv@...lanox.com>,
	Ariel Elior <ariel.elior@...gic.com>,
	Arnd Bergmann <arnd@...aro.org>,
	Baolin Wang <baolin.wang@...aro.org>,
	Ben Hutchings <ben@...adent.org.uk>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Chris Metcalf <cmetcalf@...hip.com>,
	David Miller <davem@...emloft.net>,
	Frank Li <Frank.Li@...escale.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jacob Keller <jacob.e.keller@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	John Stultz <john.stultz@...aro.org>,
	Luwei Zhou <b45643@...escale.com>,
	Matthew Vick <matthew.vick@...el.com>,
	Michael Chan <mchan@...adcom.com>,
	Prashant Sreedharan <prashant@...adcom.com>,
	Rayagond K <rayagond@...avyalabs.com>,
	Shradha Shah <sshah@...arflare.com>,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	Sonic Zhang <sonic.zhang@...log.com>,
	Stefan Sørensen 
	<stefan.sorensen@...ctralink.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH net-next V3 10/23] ptp: e1000e: convert to the 64 bit
 get/set time methods.

On Sun, Mar 29, 2015 at 11:12:00PM +0200, Richard Cochran wrote:

> @@ -171,11 +171,11 @@ static void e1000e_systim_overflow_work(struct work_struct *work)
>  	struct e1000_adapter *adapter = container_of(work, struct e1000_adapter,
>  						     systim_overflow_work.work);
>  	struct e1000_hw *hw = &adapter->hw;
> -	struct timespec ts;
> +	struct timespec64 ts;
>  
> -	adapter->ptp_clock_info.gettime(&adapter->ptp_clock_info, &ts);
> +	adapter->ptp_clock_info.gettime64(&adapter->ptp_clock_info, &ts);
>  
> -	e_dbg("SYSTIM overflow check at %ld.%09lu\n", ts.tv_sec, ts.tv_nsec);
> +	e_dbg("SYSTIM overflow check at %lld.%09lu\n", ts.tv_sec, ts.tv_nsec);

On a 64 bit build, this triggers a new warning.

drivers/net/ethernet/intel/e1000e/ptp.c: In function ‘e1000e_systim_overflow_work’:
drivers/net/ethernet/intel/e1000e/ptp.c:176:2: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 4 has type ‘__kernel_time_t’ [-Wformat]

On 32 bit, timespec64.tv_sec is of type 'time64_t' or '__s64'.

On 64 bit, timespec64.tv_sec is of type '__kernel_time_t' or
'__kernel_long_t' or 'long'.

How are we supposed to print that field?  With a cast?

Thanks,
Richard

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