linux-kernel - Re: [PATCH] powerpc: eeh: stop using do

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Date:   Mon, 6 Nov 2017 14:29:23 +1100
From:   Andrew Donnellan <andrew.donnellan@....ibm.com>
To:     Arnd Bergmann <arnd@...db.de>, Russell Currey <ruscur@...sell.cc>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     y2038@...ts.linaro.org, linux-kernel@...r.kernel.org,
        Alexey Kardashevskiy <aik@...abs.ru>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc: eeh: stop using do_gettimeofday()

On 05/11/17 08:26, Arnd Bergmann wrote:
> This interface is inefficient and deprecated because of the y2038
> overflow.
> 
> ktime_get_seconds() is an appropriate replacement here, since it
> has sufficient granularity but is more efficient and uses monotonic
> time.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Andrew Donnellan <andrew.donnellan@....ibm.com>

> ---
>   arch/powerpc/include/asm/eeh.h   | 2 +-
>   arch/powerpc/kernel/eeh_driver.c | 2 +-
>   arch/powerpc/kernel/eeh_pe.c     | 8 ++++----
>   3 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/eeh.h b/arch/powerpc/include/asm/eeh.h
> index cd1df96335e5..5161c37dd039 100644
> --- a/arch/powerpc/include/asm/eeh.h
> +++ b/arch/powerpc/include/asm/eeh.h
> @@ -93,7 +93,7 @@ struct eeh_pe {
>   	struct pci_bus *bus;		/* Top PCI bus for bus PE	*/
>   	int check_count;		/* Times of ignored error	*/
>   	int freeze_count;		/* Times of froze up		*/
> -	struct timeval tstamp;		/* Time on first-time freeze	*/
> +	time64_t tstamp;		/* Time on first-time freeze	*/
>   	int false_positives;		/* Times of reported #ff's	*/
>   	atomic_t pass_dev_cnt;		/* Count of passed through devs	*/
>   	struct eeh_pe *parent;		/* Parent PE			*/
> diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
> index 4e1b433f6cb5..4f71e4c9beb7 100644
> --- a/arch/powerpc/kernel/eeh_driver.c
> +++ b/arch/powerpc/kernel/eeh_driver.c
> @@ -623,7 +623,7 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,
>   				struct eeh_rmv_data *rmv_data)
>   {
>   	struct pci_bus *frozen_bus = eeh_pe_bus_get(pe);
> -	struct timeval tstamp;
> +	time64_t tstamp;
>   	int cnt, rc;
>   	struct eeh_dev *edev;
>   
> diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
> index 2e8d1b2b5af4..2d4956e97aa9 100644
> --- a/arch/powerpc/kernel/eeh_pe.c
> +++ b/arch/powerpc/kernel/eeh_pe.c
> @@ -526,16 +526,16 @@ int eeh_rmv_from_parent_pe(struct eeh_dev *edev)
>    */
>   void eeh_pe_update_time_stamp(struct eeh_pe *pe)
>   {
> -	struct timeval tstamp;
> +	time64_t tstamp;
>   
>   	if (!pe) return;
>   
>   	if (pe->freeze_count <= 0) {
>   		pe->freeze_count = 0;
> -		do_gettimeofday(&pe->tstamp);
> +		pe->tstamp = ktime_get_seconds();
>   	} else {
> -		do_gettimeofday(&tstamp);
> -		if (tstamp.tv_sec - pe->tstamp.tv_sec > 3600) {
> +		tstamp = ktime_get_seconds();
> +		if (tstamp - pe->tstamp > 3600) {
>   			pe->tstamp = tstamp;
>   			pe->freeze_count = 0;
>   		}
> 

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan@....ibm.com  IBM Australia Limited