linux-kernel - RE: [PATCH 3/8] Drivers: hv: vmbus: Replace cpumask_test_cpu(, cpu_online_mask) with cpu

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Message-ID: <DM5PR2101MB1047B24506389A4D25420323D79B0@DM5PR2101MB1047.namprd21.prod.outlook.com>
Date:   Thu, 18 Jun 2020 15:27:35 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/8] Drivers: hv: vmbus: Replace cpumask_test_cpu(,
 cpu_online_mask) with cpu_online()

From: Andrea Parri (Microsoft) <parri.andrea@...il.com> Sent: Wednesday, June 17, 2020 9:47 AM
> 
> A slight improvement in readability, and this does also remove one
> memory access when NR_CPUS == 1!  ;-)
> 
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> ---
>  drivers/hv/vmbus_drv.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index c3205f40d1415..452c14c656e2a 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1702,7 +1702,7 @@ static ssize_t target_cpu_store(struct vmbus_channel *channel,
>  	/* No CPUs should come up or down during this. */
>  	cpus_read_lock();
> 
> -	if (!cpumask_test_cpu(target_cpu, cpu_online_mask)) {
> +	if (!cpu_online(target_cpu)) {
>  		cpus_read_unlock();
>  		return -EINVAL;
>  	}
> --
> 2.25.1

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>