1 files changed, 130 insertions, 0 deletions
diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
new file mode 100644
index 000000000..d5e131471
--- /dev/null
+++ b/scripts/Makefile.headersinst
@@ -0,0 +1,130 @@
+# SPDX-License-Identifier: GPL-2.0
+# ==========================================================================
+# Installing headers
+#
+# All headers under include/uapi, include/generated/uapi,
+# arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
+# exported.
+# They are preprocessed to remove __KERNEL__ section of the file.
+#
+# ==========================================================================
+
+PHONY := __headers
+__headers:
+
+include scripts/Kbuild.include
+
+srcdir        := $(srctree)/$(obj)
+
+# When make is run under a fakechroot environment, the function
+# $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular
+# files. So, we are using a combination of sort/dir/wildcard which works
+# with fakechroot.
+subdirs       := $(patsubst $(srcdir)/%/,%,\
+		 $(filter-out $(srcdir)/,\
+		 $(sort $(dir $(wildcard $(srcdir)/*/)))))
+
+# Recursion
+__headers: $(subdirs)
+
+PHONY += $(subdirs)
+$(subdirs):
+	$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(dst)/$@
+
+# Skip header install/check for include/uapi and arch/$(SRCARCH)/include/uapi.
+# We have only sub-directories there.
+skip-inst := $(if $(filter %/uapi,$(obj)),1)
+
+ifeq ($(skip-inst),)
+
+# Kbuild file is optional
+kbuild-file := $(srctree)/$(obj)/Kbuild
+-include $(kbuild-file)
+
+installdir    := $(INSTALL_HDR_PATH)/$(dst)
+gendir        := $(objtree)/$(subst include/,include/generated/,$(obj))
+header-files  := $(notdir $(wildcard $(srcdir)/*.h))
+header-files  += $(notdir $(wildcard $(srcdir)/*.agh))
+header-files  := $(filter-out $(no-export-headers), $(header-files))
+genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))
+genhdr-files  := $(filter-out $(header-files), $(genhdr-files))
+
+# files used to track state of install/check
+install-file  := $(installdir)/.install
+check-file    := $(installdir)/.check
+
+# all headers files for this dir
+all-files     := $(header-files) $(genhdr-files)
+output-files  := $(addprefix $(installdir)/, $(all-files))
+
+ifneq ($(mandatory-y),)
+missing       := $(filter-out $(all-files),$(mandatory-y))
+ifneq ($(missing),)
+$(error Some mandatory headers ($(missing)) are missing in $(obj))
+endif
+endif
+
+# Work out what needs to be removed
+oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
+unwanted      := $(filter-out $(all-files),$(oldheaders))
+
+# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
+unwanted-file := $(addprefix $(installdir)/, $(unwanted))
+
+printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
+
+quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
+                            file$(if $(word 2, $(all-files)),s))
+      cmd_install = \
+        $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
+        $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
+        touch $@
+
+quiet_cmd_remove = REMOVE  $(unwanted)
+      cmd_remove = rm -f $(unwanted-file)
+
+quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)
+# Headers list can be pretty long, xargs helps to avoid
+# the "Argument list too long" error.
+      cmd_check = for f in $(all-files); do                          \
+                  echo "$(installdir)/$${f}"; done                      \
+                  | xargs                                            \
+                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
+	          touch $@
+
+ifndef HDRCHECK
+# Rules for installing headers
+__headers: $(install-file)
+	@:
+
+targets += $(install-file)
+$(install-file): scripts/headers_install.sh \
+		 $(addprefix $(srcdir)/,$(header-files)) \
+		 $(addprefix $(gendir)/,$(genhdr-files)) FORCE
+	$(if $(unwanted),$(call cmd,remove),)
+	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
+	$(call if_changed,install)
+
+else
+__headers: $(check-file)
+	@:
+
+targets += $(check-file)
+$(check-file): scripts/headers_check.pl $(output-files) FORCE
+	$(call if_changed,check)
+
+endif
+
+cmd_files := $(wildcard \
+             $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
+
+ifneq ($(cmd_files),)
+	include $(cmd_files)
+endif
+
+endif # skip-inst
+
+PHONY += FORCE
+FORCE: ;
+
+.PHONY: $(PHONY)