linux-kernel - [PATCH v3 2/4] param: export param

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Message-Id: <20250917-sound-v3-2-92ebe9472a0a@uniontech.com>
Date: Wed, 17 Sep 2025 20:46:41 +0800
From: Cryolitia PukNgae via B4 Relay <devnull+cryolitia.uniontech.com@...nel.org>
To: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, 
 Jonathan Corbet <corbet@....net>, Luis Chamberlain <mcgrof@...nel.org>, 
 Petr Pavlu <petr.pavlu@...e.com>, Daniel Gomez <da.gomez@...nel.org>, 
 Sami Tolvanen <samitolvanen@...gle.com>
Cc: linux-sound@...r.kernel.org, linux-usb@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, 
 Mingcong Bai <jeffbai@...c.io>, Kexy Biscuit <kexybiscuit@...c.io>, 
 Nie Cheng <niecheng1@...ontech.com>, Zhan Jun <zhanjun@...ontech.com>, 
 Feng Yuan <fengyuan@...ontech.com>, qaqland <anguoli@...ontech.com>, 
 kernel@...ontech.com, linux-modules@...r.kernel.org, 
 Cryolitia PukNgae <cryolitia@...ontech.com>
Subject: [PATCH v3 2/4] param: export param_array related functions

From: Cryolitia PukNgae <cryolitia@...ontech.com>

- int param_array_set(const char *val, const struct kernel_param *kp);
- int param_array_get(char *buffer, const struct kernel_param *kp);
- void param_array_free(void *arg);

It would be helpful for the new module param we designed in
snd_usb_audio, in order to run additional custom codes when params
are set in runtime, and re-use the extisted codes in param.c

Signed-off-by: Cryolitia PukNgae <cryolitia@...ontech.com>
---
 include/linux/moduleparam.h | 3 +++
 kernel/params.c             | 9 ++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index 3a25122d83e2802e6e6a1475a52816251498b26a..4ef09ad2004789855bd21783029c653fac94b9dd 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -593,6 +593,9 @@ enum hwparam_type {
 
 
 extern const struct kernel_param_ops param_array_ops;
+extern int param_array_set(const char *val, const struct kernel_param *kp);
+extern int param_array_get(char *buffer, const struct kernel_param *kp);
+extern void param_array_free(void *arg);
 
 extern const struct kernel_param_ops param_ops_string;
 extern int param_set_copystring(const char *val, const struct kernel_param *);
diff --git a/kernel/params.c b/kernel/params.c
index b96cfd693c9968012d42acb85611fee1acd47790..a936e018a1c6d0bf2b6b4566f80751840366f652 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -462,7 +462,7 @@ static int param_array(struct module *mod,
 	return 0;
 }
 
-static int param_array_set(const char *val, const struct kernel_param *kp)
+int param_array_set(const char *val, const struct kernel_param *kp)
 {
 	const struct kparam_array *arr = kp->arr;
 	unsigned int temp_num;
@@ -471,8 +471,9 @@ static int param_array_set(const char *val, const struct kernel_param *kp)
 			   arr->elemsize, arr->ops->set, kp->level,
 			   arr->num ?: &temp_num);
 }
+EXPORT_SYMBOL(param_array_set);
 
-static int param_array_get(char *buffer, const struct kernel_param *kp)
+int param_array_get(char *buffer, const struct kernel_param *kp)
 {
 	int i, off, ret;
 	const struct kparam_array *arr = kp->arr;
@@ -492,8 +493,9 @@ static int param_array_get(char *buffer, const struct kernel_param *kp)
 	buffer[off] = '\0';
 	return off;
 }
+EXPORT_SYMBOL(param_array_get);
 
-static void param_array_free(void *arg)
+void param_array_free(void *arg)
 {
 	unsigned int i;
 	const struct kparam_array *arr = arg;
@@ -502,6 +504,7 @@ static void param_array_free(void *arg)
 		for (i = 0; i < (arr->num ? *arr->num : arr->max); i++)
 			arr->ops->free(arr->elem + arr->elemsize * i);
 }
+EXPORT_SYMBOL(param_array_free);
 
 const struct kernel_param_ops param_array_ops = {
 	.set = param_array_set,

-- 
2.51.0