linux-kernel - Re: [PATCH] thermal: intel: int340x: Use sysfs_emit{

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Message-ID: <1dd5045fbbb443fc12e602fc2803857401289294.camel@linux.intel.com>
Date: Mon, 22 Dec 2025 06:43:45 -0800
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To: Thorsten Blum <thorsten.blum@...ux.dev>, "Rafael J. Wysocki"	
 <rafael@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui	
 <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>, Ingo Molnar	
 <mingo@...nel.org>, "Peter Zijlstra (Intel)" <peterz@...radead.org>, "Xin
 Li (Intel)" <xin@...or.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Dave Hansen
	 <dave.hansen@...ux.intel.com>, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: intel: int340x: Use sysfs_emit{_at} in sysfs
 show functions

On Sat, 2025-12-20 at 23:30 +0100, Thorsten Blum wrote:
> Replace sprintf() with sysfs_emit() and sysfs_emit_at() in sysfs show
> functions. sysfs_emit() and sysfs_emit_at() are preferred to format
> sysfs output as it provides better bounds checking.
> 
> Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>

Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

> ---
>  .../intel/int340x_thermal/processor_thermal_device.c     | 5 +++--
>  .../intel/int340x_thermal/processor_thermal_rfim.c       | 9 +++++--
> --
>  .../intel/int340x_thermal/processor_thermal_wt_req.c     | 7 ++++---
>  3 files changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> index 48e7849d4816..f80dbe2ca7e4 100644
> ---
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> +++
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> @@ -8,6 +8,7 @@
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/pci.h>
> +#include <linux/sysfs.h>
>  #include <linux/thermal.h>
>  #include <asm/msr.h>
>  #include "int340x_thermal_zone.h"
> @@ -23,7 +24,7 @@ static ssize_t
> power_limit_##index##_##suffix##_show(struct device *dev, \
>  { \
>  	struct proc_thermal_device *proc_dev = dev_get_drvdata(dev);
> \
>  	\
> -	return sprintf(buf, "%lu\n",\
> +	return sysfs_emit(buf, "%lu\n",\
>  	(unsigned long)proc_dev->power_limits[index].suffix * 1000);
> \
>  }
>  
> @@ -143,7 +144,7 @@ static ssize_t
> tcc_offset_degree_celsius_show(struct device *dev,
>  	if (offset < 0)
>  		return offset;
>  
> -	return sprintf(buf, "%d\n", offset);
> +	return sysfs_emit(buf, "%d\n", offset);
>  }
>  
>  static ssize_t tcc_offset_degree_celsius_store(struct device *dev,
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> index 589a3a71f0c4..bb9398dfa3c1 100644
> --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_rfim.c
> @@ -7,6 +7,7 @@
>  #include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/pci.h>
> +#include <linux/sysfs.h>
>  #include "processor_thermal_device.h"
>  
>  MODULE_IMPORT_NS("INT340X_THERMAL");
> @@ -211,9 +212,9 @@ static ssize_t suffix##_show(struct device *dev,\
>  	ret = (reg_val >> mmio_regs[ret].shift) &
> mmio_regs[ret].mask;\
>  	err = get_mapped_string(mapping, attr->attr.name, ret,
> &str);\
>  	if (!err)\
> -		return sprintf(buf, "%s\n", str);\
> +		return sysfs_emit(buf, "%s\n", str);\
>  	if (err == -EOPNOTSUPP)\
> -		return sprintf(buf, "%u\n", ret);\
> +		return sysfs_emit(buf, "%u\n", ret);\
>  	return err;\
>  }
>  
> @@ -398,7 +399,7 @@ static ssize_t rfi_restriction_show(struct device
> *dev,
>  	if (ret)
>  		return ret;
>  
> -	return sprintf(buf, "%llu\n", resp);
> +	return sysfs_emit(buf, "%llu\n", resp);
>  }
>  
>  static ssize_t ddr_data_rate_show(struct device *dev,
> @@ -413,7 +414,7 @@ static ssize_t ddr_data_rate_show(struct device
> *dev,
>  	if (ret)
>  		return ret;
>  
> -	return sprintf(buf, "%llu\n", resp);
> +	return sysfs_emit(buf, "%llu\n", resp);
>  }
>  
>  static DEVICE_ATTR_RW(rfi_restriction);
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_wt_req.c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_wt_req.c
> index b95810f4a011..2372f5202019 100644
> ---
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_wt_req.c
> +++
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_wt_req.c
> @@ -7,6 +7,7 @@
>   */
>  
>  #include <linux/pci.h>
> +#include <linux/sysfs.h>
>  #include "processor_thermal_device.h"
>  
>  /* List of workload types */
> @@ -28,9 +29,9 @@ static ssize_t workload_available_types_show(struct
> device *dev,
>  	int ret = 0;
>  
>  	while (workload_types[i] != NULL)
> -		ret += sprintf(&buf[ret], "%s ",
> workload_types[i++]);
> +		ret += sysfs_emit_at(buf, ret, "%s ",
> workload_types[i++]);
>  
> -	ret += sprintf(&buf[ret], "\n");
> +	ret += sysfs_emit_at(buf, ret, "\n");
>  
>  	return ret;
>  }
> @@ -85,7 +86,7 @@ static ssize_t workload_type_show(struct device
> *dev,
>  	if (cmd_resp > ARRAY_SIZE(workload_types) - 1)
>  		return -EINVAL;
>  
> -	return sprintf(buf, "%s\n", workload_types[cmd_resp]);
> +	return sysfs_emit(buf, "%s\n", workload_types[cmd_resp]);
>  }
>  
>  static DEVICE_ATTR_RW(workload_type);