../mm/kmemleak.c:1912:13: warning: context imbalance in 'kmemleak_seq_start' - different lock contexts for basic block ../mm/kmemleak.c: note: in included file (through ../include/linux/rculist.h, ../include/linux/sched/signal.h): ../include/linux/rcupdate.h:880:25: warning: context imbalance in 'kmemleak_seq_stop' - unexpected unlock WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/block/rnull_mod.o ../arch/x86/boot/version.c:18:12: warning: symbol 'kernel_version' was not declared. Should it be static? ../mm/kmemleak.c:1912:13: warning: context imbalance in 'kmemleak_seq_start' - different lock contexts for basic block ../mm/kmemleak.c: note: in included file (through ../include/linux/rculist.h, ../include/linux/sched/signal.h): ../include/linux/rcupdate.h:880:25: warning: context imbalance in 'kmemleak_seq_stop' - unexpected unlock WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/block/rnull_mod.o ../arch/x86/boot/version.c:18:12: warning: symbol 'kernel_version' was not declared. Should it be static?