[PATCH v3 1/4] params: lift param_set_uint_minmax to common code

[Sagi Grimberg]

It is a useful helper hence move it to common code so others can enjoy
it.

Suggested-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
Cc: linux-nfs at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
---
 include/linux/moduleparam.h |  3 +++
 kernel/params.c             | 19 +++++++++++++++++++
 net/sunrpc/xprtsock.c       | 18 ------------------
 3 files changed, 22 insertions(+), 18 deletions(-)

diff --git a/include/linux/moduleparam.h b/include/linux/moduleparam.h
index eed280fae433..b36ece513616 100644
--- a/include/linux/moduleparam.h
+++ b/include/linux/moduleparam.h
@@ -432,6 +432,9 @@ extern const struct kernel_param_ops param_ops_uint;
 extern int param_set_uint(const char *val, const struct kernel_param *kp);
 extern int param_get_uint(char *buffer, const struct kernel_param *kp);
 #define param_check_uint(name, p) __param_check(name, p, unsigned int)
+int param_set_uint_minmax(const char *val,
+			  const struct kernel_param *kp,
+			  unsigned int min, unsigned int max);
 
 extern const struct kernel_param_ops param_ops_long;
 extern int param_set_long(const char *val, const struct kernel_param *kp);
diff --git a/kernel/params.c b/kernel/params.c
index 2daa2780a92c..7d3c61e64140 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -243,6 +243,25 @@ STANDARD_PARAM_DEF(ulong,	unsigned long,		"%lu",		kstrtoul);
 STANDARD_PARAM_DEF(ullong,	unsigned long long,	"%llu",		kstrtoull);
 STANDARD_PARAM_DEF(hexint,	unsigned int,		"%#08x", 	kstrtouint);
 
+int param_set_uint_minmax(const char *val,
+			  const struct kernel_param *kp,
+			  unsigned int min, unsigned int max)
+{
+	unsigned int num;
+	int ret;
+
+	if (!val)
+		return -EINVAL;
+	ret = kstrtouint(val, 0, &num);
+	if (ret)
+		return ret;
+	if (num < min || num > max)
+		return -EINVAL;
+	*((unsigned int *)kp->arg) = num;
+	return 0;
+}
+EXPORT_SYMBOL(param_set_uint_minmax);
+
 int param_set_charp(const char *val, const struct kernel_param *kp)
 {
 	if (strlen(val) > 1024) {
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 47aa47a2b07c..0cfbf618e8c2 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -3130,24 +3130,6 @@ void cleanup_socket_xprt(void)
 	xprt_unregister_transport(&xs_bc_tcp_transport);
 }
 
-static int param_set_uint_minmax(const char *val,
-		const struct kernel_param *kp,
-		unsigned int min, unsigned int max)
-{
-	unsigned int num;
-	int ret;
-
-	if (!val)
-		return -EINVAL;
-	ret = kstrtouint(val, 0, &num);
-	if (ret)
-		return ret;
-	if (num < min || num > max)
-		return -EINVAL;
-	*((unsigned int *)kp->arg) = num;
-	return 0;
-}
-
 static int param_set_portnr(const char *val, const struct kernel_param *kp)
 {
 	return param_set_uint_minmax(val, kp,
-- 
2.27.0