kbuild: remove SUBDIRS support

  KBUILD_CHECKSRC = 0

endif

# Use make M=dir to specify directory of external module to build

# Old syntax make ... SUBDIRS=$PWD is still supported

# Setting the environment variable KBUILD_EXTMOD take precedence

ifdef SUBDIRS

  $(warning ================= WARNING ================)

  $(warning 'SUBDIRS' will be removed after Linux 5.3)

  $(warning )

  $(warning If you are building an individual subdirectory)

  $(warning in the kernel tree, you can do like this:)

  $(warning $$ make path/to/dir/you/want/to/build/)

  $(warning (Do not forget the trailing slash))

  $(warning )

  $(warning If you are building an external module,)

  $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)

  $(warning ==========================================)

  KBUILD_EXTMOD ?= $(SUBDIRS)

endif

# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the

# directory of external module to build. Setting M= takes precedence.

ifeq ("$(origin M)", "command line")

  KBUILD_EXTMOD := $(M)

endif