+KBSS_SZ = $(shell $(CROSS_COMPILE)nm $(obj)/../../../../vmlinux | \
+ perl -e 'while (<>) { \
+ $$bss_start=hex($$1) if /^([[:xdigit:]]+) B __bss_start$$/; \
+ $$bss_end=hex($$1) if /^([[:xdigit:]]+) B __bss_stop$$/; \
+ }; printf "%d\n", $$bss_end - $$bss_start;')