linux-kernel - Re: [PATCH 2/2] drivers: hv: Convert open-coded timeouts to secs_to

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Message-ID: <24981b4e-8ccb-4312-b738-e4b611739060@linux.microsoft.com>
Date: Tue, 22 Oct 2024 15:58:11 -0700
From: Easwar Hariharan <eahariha@...ux.microsoft.com>
To: lkp@...el.com, Marcel Holtmann <marcel@...tmann.org>,
 Johan Hedberg <johan.hedberg@...il.com>,
 Luiz Augusto von Dentz <luiz.dentz@...il.com>,
 Thomas Gleixner <tglx@...utronix.de>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Geert Uytterhoeven <geert@...ux-m68k.org>,
 open list <linux-kernel@...r.kernel.org>,
 "open list:BLUETOOTH SUBSYSTEM" <linux-bluetooth@...r.kernel.org>,
 "K. Y. Srinivasan" <kys@...rosoft.com>,
 Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
 Dexuan Cui <decui@...rosoft.com>, Linux-HyperV <linux-hyperv@...r.kernel.org>
Cc: eahariha@...ux.microsoft.com, Naman Jain <namjain@...ux.microsoft.com>,
 Michael Kelley <mhklinux@...look.com>
Subject: Re: [PATCH 2/2] drivers: hv: Convert open-coded timeouts to
 secs_to_jiffies()

On 10/22/2024 11:53 AM, Easwar Hariharan wrote:
> We have several places where timeouts are open-coded as N (seconds) * HZ,
> but best practice is to use the utility functions from jiffies.h. Convert
> the timeouts to be compliant. This doesn't fix any bugs, it's a simple code
> improvement.
> 
> Signed-off-by: Easwar Hariharan <eahariha@...ux.microsoft.com>
> ---
>  drivers/hv/hv_balloon.c  | 8 ++++----
>  drivers/hv/hv_kvp.c      | 4 ++--
>  drivers/hv/hv_snapshot.c | 3 ++-
>  drivers/hv/vmbus_drv.c   | 2 +-
>  4 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
> index c38dcdfcb914..79a72e68f427 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, secs_to_jiffies(5));
>  		post_status(&dm_device);
>  	}
>  }
> @@ -1373,7 +1373,7 @@ static int dm_thread_func(void *dm_dev)
>  	struct hv_dynmem_device *dm = dm_dev;
>  
>  	while (!kthread_should_stop()) {
> -		wait_for_completion_interruptible_timeout(&dm_device.config_event, 1 * HZ);
> +		wait_for_completion_interruptible_timeout(&dm_device.config_event, secs_to_jiffies(1));
>  		/*
>  		 * The host expects us to post information on the memory
>  		 * pressure every second.
> @@ -1748,7 +1748,7 @@ static int balloon_connect_vsp(struct hv_device *dev)
>  	if (ret)
>  		goto out;
>  
> -	t = wait_for_completion_timeout(&dm_device.host_event, 5 * HZ);
> +	t = wait_for_completion_timeout(&dm_device.host_event, secs_to_jiffies(5));
>  	if (t == 0) {
>  		ret = -ETIMEDOUT;
>  		goto out;
> @@ -1806,7 +1806,7 @@ static int balloon_connect_vsp(struct hv_device *dev)
>  	if (ret)
>  		goto out;
>  
> -	t = wait_for_completion_timeout(&dm_device.host_event, 5 * HZ);
> +	t = wait_for_completion_timeout(&dm_device.host_event, secs_to_jiffies(5));
>  	if (t == 0) {
>  		ret = -ETIMEDOUT;
>  		goto out;
> diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
> index d35b60c06114..29e01247a087 100644
> --- a/drivers/hv/hv_kvp.c
> +++ b/drivers/hv/hv_kvp.c
> @@ -655,7 +655,7 @@ void hv_kvp_onchannelcallback(void *context)
>  		if (host_negotiatied == NEGO_NOT_STARTED) {
>  			host_negotiatied = NEGO_IN_PROGRESS;
>  			schedule_delayed_work(&kvp_host_handshake_work,
> -				      HV_UTIL_NEGO_TIMEOUT * HZ);
> +						secs_to_jiffies(HV_UTIL_NEGO_TIMEOUT));
>  		}
>  		return;
>  	}
> @@ -724,7 +724,7 @@ void hv_kvp_onchannelcallback(void *context)
>  		 */
>  		schedule_work(&kvp_sendkey_work);
>  		schedule_delayed_work(&kvp_timeout_work,
> -					HV_UTIL_TIMEOUT * HZ);
> +				      secs_to_jiffies(HV_UTIL_TIMEOUT));
>  
>  		return;
>  
> diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
> index 0d2184be1691..86d87486ed40 100644
> --- a/drivers/hv/hv_snapshot.c
> +++ b/drivers/hv/hv_snapshot.c
> @@ -193,7 +193,8 @@ static void vss_send_op(void)
>  	vss_transaction.state = HVUTIL_USERSPACE_REQ;
>  
>  	schedule_delayed_work(&vss_timeout_work, op == VSS_OP_FREEZE ?
> -			VSS_FREEZE_TIMEOUT * HZ : HV_UTIL_TIMEOUT * HZ);
> +				secs_to_jiffies(VSS_FREEZE_TIMEOUT) :
> +				secs_to_jiffies(HV_UTIL_TIMEOUT));
>  
>  	rc = hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg), NULL);
>  	if (rc) {
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 9b15f7daf505..7db30881e83a 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -2507,7 +2507,7 @@ static int vmbus_bus_resume(struct device *dev)
>  	vmbus_request_offers();
>  
>  	if (wait_for_completion_timeout(
> -		&vmbus_connection.ready_for_resume_event, 10 * HZ) == 0)
> +		&vmbus_connection.ready_for_resume_event, secs_to_jiffies(10)) == 0)
>  		pr_err("Some vmbus device is missing after suspending?\n");
>  
>  	/* Reset the event for the next suspend. */

Sorry, I should have combined distribution lists for the two patches, so
everyone received both patches. Combining the lists with this email.

Here's the lore link for the series:
https://lore.kernel.org/all/20241022185353.2080021-1-eahariha@linux.microsoft.com/

Thanks,
Easwar