mm: move randomize_va_space into memory.c

Move the randomize_va_space variable together with all its sysctl table
elements into memory.c. Register it to the "kernel" directory by
adding it to the subsys initialization calls

This is part of a greater effort to move ctl tables into their
respective subsystems which will reduce the merge conflicts in
kernel/sysctl.c.

Reviewed-by: Luis Chamberlain <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Joel Granados <[email protected]>

Author: Joelgranados

kernel/sysctl.c

@@ -1688,15 +1688,6 @@ static const struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
-#if defined(CONFIG_MMU)
-	{
-		.procname	= "randomize_va_space",
-		.data		= &randomize_va_space,
-		.maxlen		= sizeof(int),
-		.mode		= 0644,
-		.proc_handler	= proc_dointvec,
-	},
-#endif
 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
 	{
 		.procname	= "ignore-unaligned-usertrap",

mm/memory.c

@@ -125,6 +125,24 @@ int randomize_va_space __read_mostly =
 					2;
 #endif
 
+static const struct ctl_table mmu_sysctl_table[] = {
+	{
+		.procname	= "randomize_va_space",
+		.data		= &randomize_va_space,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+};
+
+static int __init init_mm_sysctl(void)
+{
+	register_sysctl_init("kernel", mmu_sysctl_table);
+	return 0;
+}
+
+subsys_initcall(init_mm_sysctl);
+
 #ifndef arch_wants_old_prefaulted_pte
 static inline bool arch_wants_old_prefaulted_pte(void)
 {