Ensure an error if prco_douintvec_conv is erroneously called in a system
with CONFIG_PROC_SYSCTL=n

Signed-off-by: Joel Granados <joel.granados@kernel.org>
---
 kernel/sysctl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2cd767b9680eb696efeae06f436548777b1b6844..84ca24fb1965e97dc9e6f71f42a6c99c01aca3ee 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1055,6 +1055,14 @@ int proc_douintvec_minmax(const struct ctl_table *table, int dir,
 	return -ENOSYS;
 }
 
+int proc_douintvec_conv(const struct ctl_table *table, int write, void *buffer,
+			size_t *lenp, loff_t *ppos,
+			int (*conv)(unsigned long *lvalp, unsigned int *valp,
+				    int write, const struct ctl_table *table))
+{
+	return -ENOSYS;
+}
+
 int proc_dou8vec_minmax(const struct ctl_table *table, int dir,
 			void *buffer, size_t *lenp, loff_t *ppos)
 {

-- 
2.50.1