1 files changed, 41 insertions, 7 deletions

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index 973acf96f37c..124298168f8b 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -1705,6 +1705,37 @@ int __init proc_sys_init(void)
 	return sysctl_init();
 }
 
+struct sysctl_alias {
+	const char *kernel_param;
+	const char *sysctl_param;
+};
+
+/*
+ * Historically some settings had both sysctl and a command line parameter.
+ * With the generic sysctl. parameter support, we can handle them at a single
+ * place and only keep the historical name for compatibility. This is not meant
+ * to add brand new aliases. When adding existing aliases, consider whether
+ * the possibly different moment of changing the value (e.g. from early_param
+ * to the moment do_sysctl_args() is called) is an issue for the specific
+ * parameter.
+ */
+static const struct sysctl_alias sysctl_aliases[] = {
+	{"numa_zonelist_order",		"vm.numa_zonelist_order" },
+	{ }
+};
+
+static const char *sysctl_find_alias(char *param)
+{
+	const struct sysctl_alias *alias;
+
+	for (alias = &sysctl_aliases[0]; alias->kernel_param != NULL; alias++) {
+		if (strcmp(alias->kernel_param, param) == 0)
+			return alias->sysctl_param;
+	}
+
+	return NULL;
+}
+
 /* Set sysctl value passed on kernel command line. */
 static int process_sysctl_arg(char *param, char *val,
 			       const char *unused, void *arg)
@@ -1718,15 +1749,18 @@ static int process_sysctl_arg(char *param, char *val,
 	loff_t pos = 0;
 	ssize_t wret;
 
-	if (strncmp(param, "sysctl", sizeof("sysctl") - 1))
-		return 0;
-
-	param += sizeof("sysctl") - 1;
+	if (strncmp(param, "sysctl", sizeof("sysctl") - 1) == 0) {
+		param += sizeof("sysctl") - 1;
 
-	if (param[0] != '/' && param[0] != '.')
-		return 0;
+		if (param[0] != '/' && param[0] != '.')
+			return 0;
 
-	param++;
+		param++;
+	} else {
+		param = (char *) sysctl_find_alias(param);
+		if (!param)
+			return 0;
+	}
 
 	/*
 	 * To set sysctl options, we use a temporary mount of proc, look up the