Linux之kernel编译去掉：-Werror=format=

# git diff  kernel/Makefile
KBUILD_AFLAGS   := -D__ASSEMBLY__
KBUILD_CFLAGS   := -Wall -Werror -Wundef -Wstrict-prototypes -Wno-trigraphs \
		   -fno-strict-aliasing -fno-common -fshort-wchar \
		   -Werror-implicit-function-declaration \
		   -Wno-format-security \
+		   -fno-delete-null-pointer-checks \
+		   -w \
		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__