linux-kernel - RE: [PATCH v2] drivers: hv: vmbus: Clean up sscanf format specifier in target_cpu

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Message-ID:
 <SN6PR02MB4157E58381C62CCC2681A20BD416A@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Thu, 18 Sep 2025 03:51:00 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Alok Tiwari <alok.a.tiwari@...cle.com>, "kys@...rosoft.com"
	<kys@...rosoft.com>, "haiyangz@...rosoft.com" <haiyangz@...rosoft.com>,
	"wei.liu@...nel.org" <wei.liu@...nel.org>, "decui@...rosoft.com"
	<decui@...rosoft.com>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] drivers: hv: vmbus: Clean up sscanf format specifier
 in target_cpu_store()

From: Alok Tiwari <alok.a.tiwari@...cle.com> Sent: Wednesday, September 17, 2025 2:00 AM
> 
> The target_cpu_store() function parses the target CPU from the sysfs
> buffer using sscanf(). The format string currently uses "%uu", which
> is redundant. The compiler ignores the extra "u", so there is no
> incorrect parsing at runtime.
> 
> Update the format string to use "%u" for clarity and consistency.
> 
> Signed-off-by: Alok Tiwari <alok.a.tiwari@...cle.com>
> ---
> v1 -> v2
> Rephrase commit message and subject to clarify
> that there is no incorrect parsing at runtime.
> ---
>  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 5b4f8d009ca5..69591dc7bad2 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1742,7 +1742,7 @@ static ssize_t target_cpu_store(struct vmbus_channel *channel,
>  	u32 target_cpu;
>  	ssize_t ret;
> 
> -	if (sscanf(buf, "%uu", &target_cpu) != 1)
> +	if (sscanf(buf, "%u", &target_cpu) != 1)
>  		return -EIO;
> 
>  	cpus_read_lock();
> --
> 2.50.1

Reviewed-by: Michael Kelley <mhklinux@...look.com>