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/mmzone.h Signed-off-by: Dave Young <hidave.darkstar@xxxxxxxxx> --- include/linux/mmzone.h | 1 + kernel/sysctl.c | 1 - 2 files changed, 1 insertion(+), 1 deletion(-) --- linux-2.6.32.orig/include/linux/mmzone.h 2010-02-21 09:50:34.007270577 +0800 +++ linux-2.6.32/include/linux/mmzone.h 2010-02-21 09:52:21.259760505 +0800 @@ -744,6 +744,7 @@ static inline int is_dma(struct zone *zo struct ctl_table; int min_free_kbytes_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); +extern int min_free_kbytes; /* for sysctl */ extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1]; int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); --- linux-2.6.32.orig/kernel/sysctl.c 2010-02-21 09:48:06.843951983 +0800 +++ linux-2.6.32/kernel/sysctl.c 2010-02-21 09:52:58.139756932 +0800 @@ -72,7 +72,6 @@ /* External variables not in a header file. */ extern int max_threads; -extern int min_free_kbytes; extern int compat_log; extern int latencytop_enabled; extern int sysctl_nr_open_min, sysctl_nr_open_max; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>