linux-kernel - Re: [RFC PATCH] drivers: hv: Convert open-coded timeouts to msecs_to

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Message-ID: <9f4baf14-8182-451d-9849-4326a783d5c1@linux.microsoft.com>
Date: Fri, 18 Oct 2024 13:24:59 +0530
From: Praveen Kumar <kumarpraveen@...ux.microsoft.com>
To: Easwar Hariharan <eahariha@...ux.microsoft.com>, lkp@...el.com,
 "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>,
 "open list:Hyper-V/Azure CORE AND DRIVERS" <linux-hyperv@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>
Cc: Naman Jain <namjain@...ux.microsoft.com>,
 Shradha Gupta <shradhagupta@...ux.microsoft.com>
Subject: Re: [RFC PATCH] drivers: hv: Convert open-coded timeouts to
 msecs_to_jiffies()

On 17-10-2024 04:07, Easwar Hariharan wrote:
> We have several places where timeouts are open-coded as N (seconds) * HZ,
> but best practice is to use msecs_to_jiffies(). Convert the timeouts to
> make them HZ invariant.
> > Signed-off-by: Easwar Hariharan <eahariha@...ux.microsoft.com>
> ---
>  drivers/hv/hv_balloon.c  | 9 +++++----
>  drivers/hv/hv_kvp.c      | 4 ++--
>  drivers/hv/hv_snapshot.c | 6 ++++--
>  drivers/hv/vmbus_drv.c   | 2 +-
>  4 files changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
> index c38dcdfcb914d..3017d41f12681 100644
> --- a/drivers/hv/hv_balloon.c
> +++ b/drivers/hv/hv_balloon.c
> @@ -756,7 +756,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
>  		 * adding succeeded, it is ok to proceed even if the memory was
>  		 * not onlined in time.
>  		 */
> -		wait_for_completion_timeout(&dm_device.ol_waitevent, 5 * HZ);
> +		wait_for_completion_timeout(&dm_device.ol_waitevent, msecs_to_jiffies(5 * 1000));

Is it correct to convert HZ to 1000 ?
Also, how are you testing these changes ?

Regards,

~Praveen.