sysctl extern cleanup - mm

Extern declarations in sysctl.c should be move to their own head file, and then include them in relavant .c files.

Move min_free_kbytes extern declaration to linux/mm.h

---
 include/linux/mm.h |    1 +
 kernel/sysctl.c    |    1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

@@ -31,6 +31,7 @@ extern int page_cluster;
 
 #ifdef CONFIG_SYSCTL
 extern int sysctl_legacy_va_layout;
+extern int min_free_kbytes;
 #else
 #define sysctl_legacy_va_layout 0
 #endif

@@ -72,7 +72,6 @@
 #if defined(CONFIG_SYSCTL)
 
 /* External variables not in a header file. */
-extern int min_free_kbytes;
 extern int compat_log;
 extern int latencytop_enabled;
 extern int sysctl_nr_open_min, sysctl_nr_open_max;

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It should be moved to include/linux/mmzone.h, that's where the sysctl handler is declared.

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