Merge branch 'for-next/kbuild'

8 files changed, 223 insertions, 357 deletions

diff --git a/Makefile b/Makefile
index 90eee21b7c..c4030ecbf1 100644
--- a/Makefile
+++ b/Makefile
@@ -35,10 +35,8 @@ MAKEFLAGS += -rR --no-print-directory
 # To put more focus on warnings, be less verbose as default
 # Use 'make V=1' to see the full commands
 
-ifdef V
-  ifeq ("$(origin V)", "command line")
-    KBUILD_VERBOSE = $(V)
-  endif
+ifeq ("$(origin V)", "command line")
+  KBUILD_VERBOSE = $(V)
 endif
 ifndef KBUILD_VERBOSE
   KBUILD_VERBOSE = 0
@@ -54,10 +52,8 @@ endif
 # See the file "Documentation/sparse.txt" for more details, including
 # where to get the "sparse" utility.
 
-ifdef C
-  ifeq ("$(origin C)", "command line")
-    KBUILD_CHECKSRC = $(C)
-  endif
+ifeq ("$(origin C)", "command line")
+  KBUILD_CHECKSRC = $(C)
 endif
 ifndef KBUILD_CHECKSRC
   KBUILD_CHECKSRC = 0
@@ -69,10 +65,8 @@ endif
 ifdef SUBDIRS
   KBUILD_EXTMOD ?= $(SUBDIRS)
 endif
-ifdef M
-  ifeq ("$(origin M)", "command line")
-    KBUILD_EXTMOD := $(M)
-  endif
+ifeq ("$(origin M)", "command line")
+  KBUILD_EXTMOD := $(M)
 endif
 
 
@@ -98,10 +92,8 @@ ifeq ($(KBUILD_SRC),)
 
 # OK, Make called in directory where kernel src resides
 # Do we want to locate output files in a separate directory?
-ifdef O
-  ifeq ("$(origin O)", "command line")
-    KBUILD_OUTPUT := $(O)
-  endif
+ifeq ("$(origin O)", "command line")
+  KBUILD_OUTPUT := $(O)
 endif
 
 # That's our default target when none is given on the command line
@@ -117,12 +109,16 @@ KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
 $(if $(KBUILD_OUTPUT),, \
      $(error failed to create output directory "$(saved-output)"))
 
-PHONY += $(MAKECMDGOALS)
+PHONY += $(MAKECMDGOALS) sub-make
 
-$(filter-out _all,$(MAKECMDGOALS)) _all:
+$(filter-out _all sub-make,$(MAKECMDGOALS)) _all: sub-make
+	@:
+
+sub-make: FORCE
 	$(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
 	KBUILD_SRC=$(CURDIR) \
-	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
+	KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
+	$(filter-out _all sub-make,$(MAKECMDGOALS))
 
 # Leave processing to above invocation of make
 skip-makefile := 1
@@ -394,8 +390,16 @@ ifeq ($(mixed-targets),1)
 # We're called with mixed targets (*config and build targets).
 # Handle them one by one.
 
-%:: FORCE
-	$(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
+PHONY += $(MAKECMDGOALS) __build_one_by_one
+
+$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
+	@:
+
+__build_one_by_one:
+	$(Q)set -e; \
+	for i in $(MAKECMDGOALS); do \
+		$(MAKE) -f $(srctree)/Makefile $$i; \
+	done
 
 else
 ifeq ($(config-targets),1)
@@ -881,12 +885,6 @@ include/generated/utsrelease.h: include/config/kernel.release FORCE
 	$(call filechk,utsrelease.h)
 
 # ---------------------------------------------------------------------------
-
-PHONY += depend dep
-depend dep:
-	@echo '*** Warning: make $@ is unnecessary now.'
-
-# ---------------------------------------------------------------------------
 # Modules
 
 ifdef CONFIG_MODULES
@@ -1007,11 +1005,11 @@ mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
 mrproper-dirs      := $(addprefix _mrproper_,scripts)
 
-PHONY += $(mrproper-dirs) mrproper archmrproper
+PHONY += $(mrproper-dirs) mrproper
 $(mrproper-dirs):
 	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
 
-mrproper: clean archmrproper $(mrproper-dirs)
+mrproper: clean $(mrproper-dirs)
 	$(call cmd,rmdirs)
 	$(call cmd,rmfiles)
 
@@ -1043,7 +1041,7 @@ rpm: include/config/kernel.release FORCE
 # ---------------------------------------------------------------------------
 
 boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig)
-boards := $(notdir $(boards))
+boards := $(sort $(notdir $(boards)))
 
 help:
 	@echo  'Cleaning targets:'
@@ -1174,11 +1172,6 @@ ifneq ($(cmd_files),)
   include $(cmd_files)
 endif
 
-# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
-# Usage:
-# $(Q)$(MAKE) $(clean)=dir
-clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
-
 endif	# skip-makefile
 
 PHONY += FORCE
@@ -1187,6 +1180,6 @@ FORCE:
 # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes.
 Makefile: ;
 
-# Declare the contents of the .PHONY variable as phony.  We keep that
+# Declare the contents of the PHONY variable as phony.  We keep that
 # information in a variable so we can use it in if_changed and friends.
 .PHONY: $(PHONY)
diff --git a/include/linux/kconfig.h b/include/linux/kconfig.h
index cb17ee2543..fec5076eda 100644
--- a/include/linux/kconfig.h
+++ b/include/linux/kconfig.h
@@ -1,10 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __LINUX_KCONFIG_H
 #define __LINUX_KCONFIG_H
 
 #include <generated/autoconf.h>
 
+#define __ARG_PLACEHOLDER_1 0,
+#define __take_second_arg(__ignored, val, ...) val
+
+/*
+ * The use of "&&" / "||" is limited in certain expressions.
+ * The following enable to calculate "and" / "or" with macro expansion only.
+ */
+#define __and(x, y)			___and(x, y)
+#define ___and(x, y)			____and(__ARG_PLACEHOLDER_##x, y)
+#define ____and(arg1_or_junk, y)	__take_second_arg(arg1_or_junk y, 0)
+
+#define __or(x, y)			___or(x, y)
+#define ___or(x, y)			____or(__ARG_PLACEHOLDER_##x, y)
+#define ____or(arg1_or_junk, y)		__take_second_arg(arg1_or_junk 1, y)
+
 /*
- * Helper macros to use CONFIG_ options in C expressions. Note that
+ * Helper macros to use CONFIG_ options in C/CPP expressions. Note that
  * these only work with boolean and tristate options.
  */
 
@@ -16,31 +32,36 @@
  * When CONFIG_BOOGER is not defined, we generate a (... 1, 0) pair, and when
  * the last step cherry picks the 2nd arg, we get a zero.
  */
-#define __ARG_PLACEHOLDER_1 0,
-#define config_enabled(cfg) _config_enabled(cfg)
-#define _config_enabled(value) __config_enabled(__ARG_PLACEHOLDER_##value)
-#define __config_enabled(arg1_or_junk) ___config_enabled(arg1_or_junk 1, 0)
-#define ___config_enabled(__ignored, val, ...) val
-
-/*
- * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
- * 0 otherwise.
- *
- */
-#define IS_ENABLED(option) \
-	(config_enabled(option) || config_enabled(option##_MODULE))
+#define __is_defined(x)			___is_defined(x)
+#define ___is_defined(val)		____is_defined(__ARG_PLACEHOLDER_##val)
+#define ____is_defined(arg1_or_junk)	__take_second_arg(arg1_or_junk 1, 0)
 
 /*
  * IS_BUILTIN(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y', 0
  * otherwise. For boolean options, this is equivalent to
  * IS_ENABLED(CONFIG_FOO).
  */
-#define IS_BUILTIN(option) config_enabled(option)
+#define IS_BUILTIN(option) __is_defined(option)
 
 /*
  * IS_MODULE(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'm', 0
  * otherwise.
  */
-#define IS_MODULE(option) config_enabled(option##_MODULE)
+#define IS_MODULE(option) __is_defined(option##_MODULE)
+
+/*
+ * IS_REACHABLE(CONFIG_FOO) evaluates to 1 if the currently compiled
+ * code can call a function defined in code compiled based on CONFIG_FOO.
+ * This is similar to IS_ENABLED(), but returns false when invoked from
+ * built-in code when CONFIG_FOO is set to 'm'.
+ */
+#define IS_REACHABLE(option) __or(IS_BUILTIN(option), \
+				__and(IS_MODULE(option), __is_defined(MODULE)))
+
+/*
+ * IS_ENABLED(CONFIG_FOO) evaluates to 1 if CONFIG_FOO is set to 'y' or 'm',
+ * 0 otherwise.
+ */
+#define IS_ENABLED(option) __or(IS_BUILTIN(option), IS_MODULE(option))
 
 #endif /* __LINUX_KCONFIG_H */
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index edfe27ed1b..5fa7f16e12 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -7,6 +7,8 @@ quote   := "
 squote  := '
 empty   :=
 space   := $(empty) $(empty)
+space_escape := _-_SPACE_-_
+pound := \#
 
 ###
 # Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
@@ -22,10 +24,6 @@ depfile = $(subst $(comma),_,$(dot-target).d)
 basetarget = $(basename $(notdir $@))
 
 ###
-# filename of first prerequisite with directory and extension stripped
-baseprereq = $(basename $(notdir $<))
-
-###
 # Escape single quote for use in echo statements
 escsq = $(subst $(squote),'\$(squote)',$1)
 
@@ -118,11 +116,6 @@ cc-option = $(call try-run,\
 cc-option-yn = $(call try-run,\
 	$(CC) $(KBUILD_CPPFLAGS) $(CFLAGS) $(1) -c -xc /dev/null -o "$$TMP",y,n)
 
-# cc-option-align
-# Prefix align with either -falign or -malign
-cc-option-align = $(subst -functions=0,,\
-	$(call cc-option,-falign-functions=0,-malign-functions=0))
-
 # cc-disable-warning
 # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
 cc-disable-warning = $(call try-run,\
@@ -132,11 +125,6 @@ cc-disable-warning = $(call try-run,\
 # Usage gcc-ver := $(call cc-version)
 cc-version = $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-version.sh $(CC))
 
-# cc-fullversion
-# Usage gcc-ver := $(call cc-fullversion)
-cc-fullversion = $(shell $(CONFIG_SHELL) \
-	$(srctree)/scripts/gcc-version.sh -p $(CC))
-
 # cc-ifversion
 # Usage:  EXTRA_CFLAGS += $(call cc-ifversion, -lt, 0402, -O1)
 cc-ifversion = $(shell [ $(call cc-version, $(CC)) $(1) $(2) ] && echo $(3))
@@ -170,6 +158,11 @@ build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
 # $(Q)$(MAKE) $(modbuiltin)=dir
 modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
 
+# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
+# Usage:
+# $(Q)$(MAKE) $(clean)=dir
+clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
+
 # Prefix -I with $(srctree) if it is not an absolute path.
 # skip if -I has no parameter
 addtree = $(if $(patsubst -I%,%,$(1)), \
@@ -198,21 +191,21 @@ objectify = $(foreach o,$(1),$(if $(filter /%,$(o)),$(o),$(obj)/$(o)))
 # See Documentation/kbuild/makefiles.txt for more info
 
 ifneq ($(KBUILD_NOCMDDEP),1)
-# Check if both arguments has same arguments. Result is empty string if equal.
-# User may override this check using make KBUILD_NOCMDDEP=1
-arg-check = $(strip $(filter-out $(cmd_$(1)), $(cmd_$@)) \
-                    $(filter-out $(cmd_$@),   $(cmd_$(1))) )
+# Check if both arguments are the same including their order. Result is empty
+# string if equal. User may override this check using make KBUILD_NOCMDDEP=1
+arg-check = $(filter-out $(subst $(space),$(space_escape),$(strip $(cmd_$@))), \
+                         $(subst $(space),$(space_escape),$(strip $(cmd_$1))))
 else
 arg-check = $(if $(strip $(cmd_$@)),,1)
 endif
 
 # Replace >$< with >$$< to preserve $ when reloading the .cmd file
 # (needed for make)
-# Replace >#< with >\#< to avoid starting a comment in the .cmd file
+# Replace >#< with >$(pound)< to avoid starting a comment in the .cmd file
 # (needed for make)
 # Replace >'< with >'\''< to be able to enclose the whole string in '...'
 # (needed for the shell)
-make-cmd = $(call escsq,$(subst \#,\\\#,$(subst $$,$$$$,$(cmd_$(1)))))
+make-cmd = $(call escsq,$(subst $(pound),$$(pound),$(subst $$,$$$$,$(cmd_$(1)))))
 
 # Find any prerequisites that is newer than target or that does not exist.
 # PHONY targets skipped in both cases.
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 3c686e46ff..2c45ea872f 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -42,14 +42,7 @@ include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-di
 
 include scripts/Makefile.lib
 
-ifdef host-progs
-ifneq ($(hostprogs-y),$(host-progs))
-$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
-hostprogs-y += $(host-progs)
-endif
-endif
-
-# Do not include host rules unles needed
+# Do not include host rules unless needed
 ifneq ($(hostprogs-y)$(hostprogs-m),)
 include scripts/Makefile.host
 endif
@@ -63,31 +56,6 @@ _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
 endif
 
-
-ifdef EXTRA_TARGETS
-$(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
-endif
-
-ifdef build-targets
-$(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
-endif
-
-ifdef export-objs
-$(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
-endif
-
-ifdef O_TARGET
-$(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
-endif
-
-ifdef L_TARGET
-$(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
-endif
-
-ifdef list-multi
-$(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
-endif
-
 ifndef obj
 $(warning kbuild: Makefile.build is included improperly)
 endif
@@ -98,7 +66,7 @@ ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
 lib-target := $(obj)/lib.a
 endif
 
-ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target) $(pbl-y)),)
+ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(lib-target) $(pbl-y)),)
 builtin-target := $(obj)/built-in.o
 endif
 
@@ -116,17 +84,14 @@ __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(pbl-target) $(
 	@:
 
 # Linus' kernel sanity checking tool
-ifneq ($(KBUILD_CHECKSRC),0)
-  ifeq ($(KBUILD_CHECKSRC),2)
-    quiet_cmd_force_checksrc = CHECK   $<
-          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
-  else
-      quiet_cmd_checksrc     = CHECK   $<
-            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
-  endif
+ifeq ($(KBUILD_CHECKSRC),1)
+  quiet_cmd_checksrc       = CHECK   $<
+        cmd_checksrc       = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
+else ifeq ($(KBUILD_CHECKSRC),2)
+  quiet_cmd_force_checksrc = CHECK   $<
+        cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
 endif
 
-
 # Compile C sources (.c)
 # ---------------------------------------------------------------------------
 
@@ -341,7 +306,7 @@ endif # pbl-target
 #
 ifdef lib-target
 quiet_cmd_link_l_target = AR      $@
-cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
+cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
 
 $(lib-target): $(lib-y) FORCE
 	$(call if_changed,link_l_target)
@@ -385,9 +350,13 @@ targets := $(filter-out $(PHONY), $(targets))
 intermediate_targets = $(foreach sfx, $(2), \
 				$(patsubst %$(strip $(1)),%$(sfx), \
 					$(filter %$(strip $(1)), $(targets))))
+# %.asn1.o <- %.asn1.[ch] <- %.asn1
+# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
 # %.lex.o <- %.lex.c <- %.l
 # %.tab.o <- %.tab.[ch] <- %.y
-targets += $(call intermediate_targets, .lex.o, .lex.c) \
+targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
+	   $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
+	   $(call intermediate_targets, .lex.o, .lex.c) \
 	   $(call intermediate_targets, .tab.o, .tab.c .tab.h)
 
 # Descending
@@ -416,8 +385,4 @@ ifneq ($(cmd_files),)
   include $(cmd_files)
 endif
 
-
-# Declare the contents of the .PHONY variable as phony.  We keep that
-# information in a variable se we can use it in if_changed and friends.
-
 .PHONY: $(PHONY)
diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
index cff33498fa..41712f8975 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -7,10 +7,7 @@ src := $(obj)
 PHONY := __clean
 __clean:
 
-# Shorthand for $(Q)$(MAKE) scripts/Makefile.clean obj=dir
-# Usage:
-# $(Q)$(MAKE) $(clean)=dir
-clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
+include scripts/Kbuild.include
 
 # The filename Kbuild has precedence over Makefile
 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
@@ -23,26 +20,23 @@ __subdir-y	:= $(patsubst %/,%,$(filter %/, $(obj-y)))
 subdir-y	+= $(__subdir-y)
 __subdir-m	:= $(patsubst %/,%,$(filter %/, $(obj-m)))
 subdir-m	+= $(__subdir-m)
-__subdir-n	:= $(patsubst %/,%,$(filter %/, $(obj-n)))
-subdir-n	+= $(__subdir-n)
 __subdir-	:= $(patsubst %/,%,$(filter %/, $(obj-)))
 subdir-		+= $(__subdir-)
 
 # Subdirectories we need to descend into
 
 subdir-ym	:= $(sort $(subdir-y) $(subdir-m))
-subdir-ymn      := $(sort $(subdir-ym) $(subdir-n) $(subdir-))
+subdir-ymn      := $(sort $(subdir-ym) $(subdir-))
 
 # Add subdir path
 
 subdir-ymn	:= $(addprefix $(obj)/,$(subdir-ymn))
 
-# build a list of files to remove, usually releative to the current
+# build a list of files to remove, usually relative to the current
 # directory
 
-__clean-files	:= $(extra-y) $(EXTRA_TARGETS) $(always) \
-		   $(targets) $(clean-files)             \
-		   $(host-progs)                         \
+__clean-files	:= $(extra-y) $(extra-m) $(extra-)       \
+		   $(always) $(targets) $(clean-files)   \
 		   $(hostprogs-y) $(hostprogs-m) $(hostprogs-)
 
 # as clean-files is given relative to the current directory, this adds
@@ -74,9 +68,6 @@ endif
 ifneq ($(strip $(__clean-dirs)),)
 	+$(call cmd,cleandir)
 endif
-ifneq ($(strip $(clean-rule)),)
-	+$(clean-rule)
-endif
 	@:
 
 
@@ -91,12 +82,4 @@ PHONY += $(subdir-ymn)
 $(subdir-ymn):
 	$(Q)$(MAKE) $(clean)=$@
 
-# If quiet is set, only print short version of command
-
-cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))
-
-
-# Declare the contents of the .PHONY variable as phony.  We keep that
-# information in a variable se we can use it in if_changed and friends.
-
 .PHONY: $(PHONY)
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index afe487536b..7b8643bf57 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -1,5 +1,3 @@
-# Backward compatibility - to be removed...
-extra-y	+= $(EXTRA_TARGETS)
 # Figure out what we need to build from the various variables
 # ===========================================================================
 
@@ -216,7 +214,7 @@ $(obj)/%:: $(src)/%_shipped
 #	target: source(s) FORCE
 #		$(if_changed,ld/objcopy/gzip)
 #
-#	and add target to EXTRA_TARGETS so that we know we have to
+#	and add target to extra-y so that we know we have to
 #	read in the saved command line
 
 # Linking
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 7620c608bc..78e6edd925 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -125,8 +125,4 @@ ifneq ($(cmd_files),)
   include $(cmd_files)
 endif
 
-
-# Declare the contents of the .PHONY variable as phony.  We keep that
-# information in a variable se we can use it in if_changed and friends.
-
 .PHONY: $(PHONY)
diff --git a/scripts/basic/fixdep.c b/scripts/basic/fixdep.c
index 078fe1d64e..facbd603ad 100644
--- a/scripts/basic/fixdep.c
+++ b/scripts/basic/fixdep.c
@@ -25,7 +25,7 @@
  *
  * So we play the same trick that "mkdep" played before. We replace
  * the dependency on autoconf.h by a dependency on every config
- * option which is mentioned in any of the listed prequisites.
+ * option which is mentioned in any of the listed prerequisites.
  *
  * kconfig populates a tree in include/config/ with an empty file
  * for each config symbol and when the configuration is updated
@@ -34,7 +34,7 @@
  * the config symbols are rebuilt.
  *
  * So if the user changes his CONFIG_HIS_DRIVER option, only the objects
- * which depend on "include/linux/config/his/driver.h" will be rebuilt,
+ * which depend on "include/config/his/driver.h" will be rebuilt,
  * so most likely only his driver ;-)
  *
  * The idea above dates, by the way, back to Michael E Chastain, AFAIK.
@@ -75,15 +75,14 @@
  * and then basically copies the .<target>.d file to stdout, in the
  * process filtering out the dependency on autoconf.h and adding
  * dependencies on include/config/my/option.h for every
- * CONFIG_MY_OPTION encountered in any of the prequisites.
+ * CONFIG_MY_OPTION encountered in any of the prerequisites.
  *
  * It will also filter out all the dependencies on *.ver. We need
  * to make sure that the generated version checksum are globally up
  * to date before even starting the recursive build, so it's too late
  * at this point anyway.
  *
- * The algorithm to grep for "CONFIG_..." is bit unusual, but should
- * be fast ;-) We don't even try to really parse the header files, but
+ * We don't even try to really parse the header files, but
  * merely grep, i.e. if CONFIG_FOO is mentioned in a comment, it will
  * be picked up as well. It's not a problem with respect to
  * correctness, since that can only give too many dependencies, thus
@@ -94,35 +93,15 @@
  * (Note: it'd be easy to port over the complete mkdep state machine,
  *  but I don't think the added complexity is worth it)
  */
-/*
- * Note 2: if somebody writes HELLO_CONFIG_BOOM in a file, it will depend onto
- * CONFIG_BOOM. This could seem a bug (not too hard to fix), but please do not
- * fix it! Some UserModeLinux files (look at arch/um/) call CONFIG_BOOM as
- * UML_CONFIG_BOOM, to avoid conflicts with /usr/include/linux/autoconf.h,
- * through arch/um/include/uml-config.h; this fixdep "bug" makes sure that
- * those files will have correct dependencies.
- */
 
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <sys/mman.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
-#include <limits.h>
 #include <ctype.h>
-#include <arpa/inet.h>
-
-#define INT_CONF ntohl(0x434f4e46)
-#define INT_ONFI ntohl(0x4f4e4649)
-#define INT_NFIG ntohl(0x4e464947)
-#define INT_FIG_ ntohl(0x4649475f)
-
-char *target;
-char *depfile;
-char *cmdline;
 
 static void usage(void)
 {
@@ -131,11 +110,24 @@ static void usage(void)
 }
 
 /*
- * Print out the commandline prefixed with cmd_<target filename> :=
+ * Print out a dependency path from a symbol name
  */
-static void print_cmdline(void)
+static void print_dep(const char *m, int slen, const char *dir)
 {
-	printf("cmd_%s := %s\n\n", target, cmdline);
+	int c, prev_c = '/', i;
+
+	printf("    $(wildcard %s/", dir);
+	for (i = 0; i < slen; i++) {
+		c = m[i];
+		if (c == '_')
+			c = '/';
+		else
+			c = tolower(c);
+		if (c != '/' || prev_c != '/')
+			putchar(c);
+		prev_c = c;
+	}
+	printf(".h) \\\n");
 }
 
 struct item {
@@ -192,121 +184,92 @@ static void define_config(const char *name, int len, unsigned int hash)
 }
 
 /*
- * Clear the set of configuration strings.
- */
-static void clear_config(void)
-{
-	struct item *aux, *next;
-	unsigned int i;
-
-	for (i = 0; i < HASHSZ; i++) {
-		for (aux = hashtab[i]; aux; aux = next) {
-			next = aux->next;
-			free(aux);
-		}
-		hashtab[i] = NULL;
-	}
-}
-
-/*
  * Record the use of a CONFIG_* word.
  */
 static void use_config(const char *m, int slen)
 {
 	unsigned int hash = strhash(m, slen);
-	int c, i;
 
 	if (is_defined_config(m, slen, hash))
 	    return;
 
 	define_config(m, slen, hash);
-
-	printf("    $(wildcard include/config/");
-	for (i = 0; i < slen; i++) {
-		c = m[i];
-		if (c == '_')
-			c = '/';
-		else
-			c = tolower(c);
-		putchar(c);
-	}
-	printf(".h) \\\n");
+	print_dep(m, slen, "include/config");
 }
 
-static void parse_config_file(const char *map, size_t len)
+/* test if s ends in sub */
+static int str_ends_with(const char *s, int slen, const char *sub)
 {
-	const int *end = (const int *) (map + len);
-	/* start at +1, so that p can never be < map */
-	const int *m   = (const int *) map + 1;
-	const char *p, *q;
-
-	for (; m < end; m++) {
-		if (*m == INT_CONF) { p = (char *) m  ; goto conf; }
-		if (*m == INT_ONFI) { p = (char *) m-1; goto conf; }
-		if (*m == INT_NFIG) { p = (char *) m-2; goto conf; }
-		if (*m == INT_FIG_) { p = (char *) m-3; goto conf; }
-		continue;
-	conf:
-		if (p > map + len - 7)
-			continue;
-		if (memcmp(p, "CONFIG_", 7))
-			continue;
-		for (q = p + 7; q < map + len; q++) {
-			if (!(isalnum(*q) || *q == '_'))
-				goto found;
-		}
-		continue;
+	int sublen = strlen(sub);
 
-	found:
-		if (!memcmp(q - 7, "_MODULE", 7))
-			q -= 7;
-		if( (q-p-7) < 0 )
-			continue;
-		use_config(p+7, q-p-7);
-	}
+	if (sublen > slen)
+		return 0;
+
+	return !memcmp(s + slen - sublen, sub, sublen);
 }
 
-/* test is s ends in sub */
-static int strrcmp(char *s, char *sub)
+static void parse_config_file(const char *p)
 {
-	int slen = strlen(s);
-	int sublen = strlen(sub);
-
-	if (sublen > slen)
-		return 1;
+	const char *q, *r;
+	const char *start = p;
 
-	return memcmp(s + slen - sublen, sub, sublen);
+	while ((p = strstr(p, "CONFIG_"))) {
+		if (p > start && (isalnum(p[-1]) || p[-1] == '_')) {
+			p += 7;
+			continue;
+		}
+		p += 7;
+		q = p;
+		while (*q && (isalnum(*q) || *q == '_'))
+			q++;
+		if (str_ends_with(p, q - p, "_MODULE"))
+			r = q - 7;
+		else
+			r = q;
+		if (r > p)
+			use_config(p, r - p);
+		p = q;
+	}
 }
 
-static void do_config_file(const char *filename)
+static void *read_file(const char *filename)
 {
 	struct stat st;
 	int fd;
-	void *map;
+	char *buf;
 
 	fd = open(filename, O_RDONLY);
 	if (fd < 0) {
-		fprintf(stderr, "fixdep: error opening config file: ");
+		fprintf(stderr, "fixdep: error opening file: ");
 		perror(filename);
 		exit(2);
 	}
-	fstat(fd, &st);
-	if (st.st_size == 0) {
-		close(fd);
-		return;
+	if (fstat(fd, &st) < 0) {
+		fprintf(stderr, "fixdep: error fstat'ing file: ");
+		perror(filename);
+		exit(2);
 	}
-	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-	if ((long) map == -1) {
-		perror("fixdep: mmap");
-		close(fd);
-		return;
+	buf = malloc(st.st_size + 1);
+	if (!buf) {
+		perror("fixdep: malloc");
+		exit(2);
 	}
+	if (read(fd, buf, st.st_size) != st.st_size) {
+		perror("fixdep: read");
+		exit(2);
+	}
+	buf[st.st_size] = '\0';
+	close(fd);
 
-	parse_config_file(map, st.st_size);
-
-	munmap(map, st.st_size);
+	return buf;
+}
 
-	close(fd);
+/* Ignore certain dependencies */
+static int is_ignored_file(const char *s, int len)
+{
+	return str_ends_with(s, len, "include/generated/autoconf.h") ||
+	       str_ends_with(s, len, "include/generated/autoksyms.h") ||
+	       str_ends_with(s, len, ".ver");
 }
 
 /*
@@ -314,72 +277,70 @@ static void do_config_file(const char *filename)
  * assignments are parsed not only by make, but also by the rather simple
  * parser in scripts/mod/sumversion.c.
  */
-static void parse_dep_file(void *map, size_t len)
+static void parse_dep_file(char *m, const char *target)
 {
-	char *m = map;
-	char *end = m + len;
 	char *p;
-	char s[PATH_MAX];
-	int is_target;
+	int is_last, is_target;
 	int saw_any_target = 0;
 	int is_first_dep = 0;
+	void *buf;
 
-	clear_config();
-
-	while (m < end) {
+	while (1) {
 		/* Skip any "white space" */
-		while (m < end && (*m == ' ' || *m == '\\' || *m == '\n'))
+		while (*m == ' ' || *m == '\\' || *m == '\n')
 			m++;
+
+		if (!*m)
+			break;
+
 		/* Find next "white space" */
 		p = m;
-		while (p < end && *p != ' ' && *p != '\\' && *p != '\n')
+		while (*p && *p != ' ' && *p != '\\' && *p != '\n')
 			p++;
+		is_last = (*p == '\0');
 		/* Is the token we found a target name? */
 		is_target = (*(p-1) == ':');
 		/* Don't write any target names into the dependency file */
 		if (is_target) {
 			/* The /next/ file is the first dependency */
 			is_first_dep = 1;
-		} else {
-			/* Save this token/filename */
-			memcpy(s, m, p-m);
-			s[p - m] = 0;
-
-			/* Ignore certain dependencies */
-			if (strrcmp(s, "include/generated/autoconf.h") &&
-			    strrcmp(s, "arch/um/include/uml-config.h") &&
-			    strrcmp(s, "include/linux/kconfig.h") &&
-			    strrcmp(s, ".ver")) {
+		} else if (!is_ignored_file(m, p - m)) {
+			*p = '\0';
+
+			/*
+			 * Do not list the source file as dependency, so that
+			 * kbuild is not confused if a .c file is rewritten
+			 * into .S or vice versa. Storing it in source_* is
+			 * needed for modpost to compute srcversions.
+			 */
+			if (is_first_dep) {
 				/*
-				 * Do not list the source file as dependency,
-				 * so that kbuild is not confused if a .c file
-				 * is rewritten into .S or vice versa. Storing
-				 * it in source_* is needed for modpost to
-				 * compute srcversions.
+				 * If processing the concatenation of multiple
+				 * dependency files, only process the first
+				 * target name, which will be the original
+				 * source name, and ignore any other target
+				 * names, which will be intermediate temporary
+				 * files.
 				 */
-				if (is_first_dep) {
-					/*
-					 * If processing the concatenation of
-					 * multiple dependency files, only
-					 * process the first target name, which
-					 * will be the original source name,
-					 * and ignore any other target names,
-					 * which will be intermediate temporary
-					 * files.
-					 */
-					if (!saw_any_target) {
-						saw_any_target = 1;
-						printf("source_%s := %s\n\n",
-							target, s);
-						printf("deps_%s := \\\n",
-							target);
-					}
-					is_first_dep = 0;
-				} else
-					printf("  %s \\\n", s);
-				do_config_file(s);
+				if (!saw_any_target) {
+					saw_any_target = 1;
+					printf("source_%s := %s\n\n",
+					       target, m);
+					printf("deps_%s := \\\n", target);
+				}
+				is_first_dep = 0;
+			} else {
+				printf("  %s \\\n", m);
 			}
+
+			buf = read_file(m);
+			parse_config_file(buf);
+			free(buf);
 		}
+
+		if (is_last)
+			break;
+
 		/*
 		 * Start searching for next token immediately after the first
 		 * "whitespace" character that follows this token.
@@ -396,57 +357,10 @@ static void parse_dep_file(void *map, size_t len)
 	printf("$(deps_%s):\n", target);
 }
 
-static void print_deps(void)
-{
-	struct stat st;
-	int fd;
-	void *map;
-
-	fd = open(depfile, O_RDONLY);
-	if (fd < 0) {
-		fprintf(stderr, "fixdep: error opening depfile: ");
-		perror(depfile);
-		exit(2);
-	}
-	if (fstat(fd, &st) < 0) {
-                fprintf(stderr, "fixdep: error fstat'ing depfile: ");
-                perror(depfile);
-                exit(2);
-        }
-	if (st.st_size == 0) {
-		fprintf(stderr,"fixdep: %s is empty\n",depfile);
-		close(fd);
-		return;
-	}
-	map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
-	if ((long) map == -1) {
-		perror("fixdep: mmap");
-		close(fd);
-		return;
-	}
-
-	parse_dep_file(map, st.st_size);
-
-	munmap(map, st.st_size);
-
-	close(fd);
-}
-
-static void traps(void)
-{
-	static char test[] __attribute__((aligned(sizeof(int)))) = "CONF";
-	int *p = (int *)test;
-
-	if (*p != INT_CONF) {
-		fprintf(stderr, "fixdep: sizeof(int) != 4 or wrong endianness? %#x\n",
-			*p);
-		exit(2);
-	}
-}
-
 int main(int argc, char *argv[])
 {
-	traps();
+	const char *depfile, *target, *cmdline;
+	void *buf;
 
 	if (argc != 4)
 		usage();
@@ -455,8 +369,11 @@ int main(int argc, char *argv[])
 	target = argv[2];
 	cmdline = argv[3];
 
-	print_cmdline();
-	print_deps();
+	printf("cmd_%s := %s\n\n", target, cmdline);
+
+	buf = read_file(depfile);
+	parse_dep_file(buf, target);
+	free(buf);
 
 	return 0;
 }