linux-kernel - Re: [PATCH] platform/x86: use sysfs

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Date:   Thu, 8 Dec 2022 16:54:38 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     ye.xingchen@....com.cn
Cc:     justin.ernst@....com, markgross@...nel.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: use sysfs_emit() to instead of scnprintf()

Hi,

On 12/2/22 10:05, ye.xingchen@....com.cn wrote:
> From: ye xingchen <ye.xingchen@....com.cn>
> 
> Follow the advice of the Documentation/filesystems/sysfs.rst and show()
> should only use sysfs_emit() or sysfs_emit_at() when formatting the
> value to be returned to user space.
> 
> Signed-off-by: ye xingchen <ye.xingchen@....com.cn>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans


> ---
>  drivers/platform/x86/uv_sysfs.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/platform/x86/uv_sysfs.c b/drivers/platform/x86/uv_sysfs.c
> index 625b0b79d185..73fc38ee7430 100644
> --- a/drivers/platform/x86/uv_sysfs.c
> +++ b/drivers/platform/x86/uv_sysfs.c
> @@ -119,12 +119,12 @@ struct uv_hub {
> 
>  static ssize_t hub_name_show(struct uv_bios_hub_info *hub_info, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "%s\n", hub_info->name);
> +	return sysfs_emit(buf, "%s\n", hub_info->name);
>  }
> 
>  static ssize_t hub_location_show(struct uv_bios_hub_info *hub_info, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "%s\n", hub_info->location);
> +	return sysfs_emit(buf, "%s\n", hub_info->location);
>  }
> 
>  static ssize_t hub_partition_show(struct uv_bios_hub_info *hub_info, char *buf)
> @@ -460,12 +460,12 @@ struct uv_pci_top_obj {
> 
>  static ssize_t uv_pci_type_show(struct uv_pci_top_obj *top_obj, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "%s\n", top_obj->type);
> +	return sysfs_emit(buf, "%s\n", top_obj->type);
>  }
> 
>  static ssize_t uv_pci_location_show(struct uv_pci_top_obj *top_obj, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "%s\n", top_obj->location);
> +	return sysfs_emit(buf, "%s\n", top_obj->location);
>  }
> 
>  static ssize_t uv_pci_iio_stack_show(struct uv_pci_top_obj *top_obj, char *buf)
> @@ -475,7 +475,7 @@ static ssize_t uv_pci_iio_stack_show(struct uv_pci_top_obj *top_obj, char *buf)
> 
>  static ssize_t uv_pci_ppb_addr_show(struct uv_pci_top_obj *top_obj, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "%s\n", top_obj->ppb_addr);
> +	return sysfs_emit(buf, "%s\n", top_obj->ppb_addr);
>  }
> 
>  static ssize_t uv_pci_slot_show(struct uv_pci_top_obj *top_obj, char *buf)
> @@ -737,7 +737,7 @@ static ssize_t coherence_id_show(struct kobject *kobj,
>  static ssize_t uv_type_show(struct kobject *kobj,
>  			struct kobj_attribute *attr, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "%s\n", uv_type_string());
> +	return sysfs_emit(buf, "%s\n", uv_type_string());
>  }
> 
>  static ssize_t uv_archtype_show(struct kobject *kobj,
> @@ -749,13 +749,13 @@ static ssize_t uv_archtype_show(struct kobject *kobj,
>  static ssize_t uv_hub_type_show(struct kobject *kobj,
>  			struct kobj_attribute *attr, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "0x%x\n", uv_hub_type());
> +	return sysfs_emit(buf, "0x%x\n", uv_hub_type());
>  }
> 
>  static ssize_t uv_hubless_show(struct kobject *kobj,
>  			struct kobj_attribute *attr, char *buf)
>  {
> -	return scnprintf(buf, PAGE_SIZE, "0x%x\n", uv_get_hubless_system());
> +	return sysfs_emit(buf, "0x%x\n", uv_get_hubless_system());
>  }
> 
>  static struct kobj_attribute partition_id_attr =