Index: linux-2.6.1/Makefile
===================================================================
--- linux-2.6.1.orig/Makefile
+++ linux-2.6.1/Makefile
@@ -289,7 +289,10 @@ export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFL
 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 
 export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 
-export MODVERDIR := .tmp_versions
+# When compiling out-of-tree modules, put MODVERDIR in the module source
+# tree rather than in the kernel source tree. The kernel source tree might
+# even be read-only.
+export MODVERDIR := $(patsubst %,%/,$(firstword $(filter ../% /%,$(SUBDIRS)))).tmp_versions
 
 # The temporary file to save gcc -MD generated dependencies must not
 # contain a comma
@@ -748,6 +751,9 @@ endif
 _modinst_post: _modinst_
 	if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 
+modules_add:
+	$(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
+
 else # CONFIG_MODULES
 
 # Modules not configured
@@ -819,11 +825,28 @@ clean-dirs += $(addprefix _clean_,$(ALL_
 $(clean-dirs):
 	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
 
+.PHONY: _clean _mrproper
+ifeq ($(filter ../% /%,$(SUBDIRS)),)
+
+clean_subdirs := .
+clean: _clean archclean $(clean-dirs)
+	$(call cmd,rmclean)
+mrproper distclean: clean _mrproper archmrproper
+	$(call cmd,mrproper)
+
+else
+
+clean_subdirs := $(filter ../% /%,$(SUBDIRS))
+clean: _clean
+mrproper distclean: _mrproper
+	$(Q)rm -rf $(MODVERDIR)
+
+endif
+
 quiet_cmd_rmclean = RM  $$(CLEAN_FILES)
 cmd_rmclean	  = rm -f $(CLEAN_FILES)
-clean: archclean $(clean-dirs)
-	$(call cmd,rmclean)
-	@find . $(RCS_FIND_IGNORE) \
+_clean:
+	@find $(clean_subdirs) $(RCS_FIND_IGNORE) \
 	 	\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
 		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
 		-type f -print | xargs rm -f
@@ -832,15 +855,13 @@ clean: archclean $(clean-dirs)
 #
 quiet_cmd_mrproper = RM  $$(MRPROPER_DIRS) + $$(MRPROPER_FILES)
 cmd_mrproper = rm -rf $(MRPROPER_DIRS) && rm -f $(MRPROPER_FILES)
-mrproper distclean: clean archmrproper
-	@echo '  Making $@ in the srctree'
-	@find . $(RCS_FIND_IGNORE) \
+_mrproper:
+	@find $(clean_subdirs) $(RCS_FIND_IGNORE) \
 	 	\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
 	 	-o -name '.*.rej' -o -size 0 \
 		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
 		-type f -print | xargs rm -f
-	$(call cmd,mrproper)
 
 # Generate tags for editors
 # ---------------------------------------------------------------------------
@@ -1045,12 +1066,13 @@ define filechk
 	@set -e;				\
 	echo '  CHK     $@';			\
 	mkdir -p $(dir $@);			\
-	$(filechk_$(1)) < $< > $@.tmp;		\
-	if [ -r $@ ] && cmp -s $@ $@.tmp; then	\
-		rm -f $@.tmp;			\
+	tmp=$$(/bin/mktemp /tmp/kbuild.XXXXXX);	\
+	$(filechk_$(1)) < $< > $$tmp;		\
+	if [ -r $@ ] && cmp -s $@ $$tmp; then	\
+		rm -f $$tmp;			\
 	else					\
 		echo '  UPD     $@';		\
-		mv -f $@.tmp $@;		\
+		mv -f $$tmp $@;		\
 	fi
 endef
 
Index: linux-2.6.1/scripts/modpost.c
===================================================================
--- linux-2.6.1.orig/scripts/modpost.c
+++ linux-2.6.1/scripts/modpost.c
@@ -15,7 +15,7 @@
 
 /* Are we using CONFIG_MODVERSIONS? */
 int modversions = 0;
-/* Do we have vmlinux? */
+/* Warn about undefined symbols? (do so if we have vmlinux) */
 int have_vmlinux = 0;
 
 void
@@ -60,6 +60,17 @@ void *do_nofail(void *ptr, const char *f
 static struct module *modules;
 
 struct module *
+find_module(char *modname)
+{
+	struct module *mod;
+
+	for (mod = modules; mod; mod = mod->next)
+		if (strcmp(mod->name, modname) == 0)
+			break;
+	return mod;
+}
+
+struct module *
 new_module(char *modname)
 {
 	struct module *mod;
@@ -165,7 +176,7 @@ add_exported_symbol(const char *name, st
 	struct symbol *s = find_symbol(name);
 
 	if (!s) {
-		new_symbol(name, modules, crc);
+		new_symbol(name, module, crc);
 		return;
 	}
 	if (crc) {
@@ -346,14 +357,17 @@ read_symbols(char *modname)
 	struct symbol *s;
 	Elf_Sym *sym;
 
-	/* When there's no vmlinux, don't print warnings about
-	 * unresolved symbols (since there'll be too many ;) */
-	have_vmlinux = is_vmlinux(modname);
-
 	parse_elf(&info, modname);
 
 	mod = new_module(modname);
 
+	/* When we have vmlinux, print warnings about unresolved
+	 * symbols. (Otherwise, there might be too many). */
+	if (strcmp(modname, "vmlinux") == 0) {
+		have_vmlinux = 1;
+		mod->skip = 1;
+	}
+
 	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
 		symname = info.strtab + sym->st_name;
 
@@ -541,19 +555,91 @@ write_if_changed(struct buffer *b, const
 	fclose(file);
 }
 
+void
+read_dump(FILE *file)
+{
+	unsigned int crc;
+	char symname[128], modname[4096];
+
+	while (fscanf(file, "%x %128s %4096s", &crc, symname, modname) == 3) {
+		struct module *mod;
+		if (!(mod = find_module(modname))) {
+			mod = new_module(NOFAIL(strdup(modname)));
+			mod->skip = 1;
+		}
+		add_exported_symbol(symname, mod, &crc);
+	}
+	if (!feof(file)) {
+		fatal("parse error in symbol dump file\n");
+	}
+}
+
+void
+write_dump(FILE *file)
+{
+	struct symbol *symbol;
+	int n;
+
+	for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
+		symbol = symbolhash[n];
+		while (symbol) {
+			symbol = symbol->next;
+		}
+	}
+
+	for (n = 0; n < SYMBOL_HASH_SIZE ; n++) {
+		symbol = symbolhash[n];
+		while (symbol) {
+			fprintf(file, "0x%08x\t%s\t%s\n", symbol->crc,
+				symbol->name, symbol->module->name);
+			symbol = symbol->next;
+		}
+	}
+}
+
 int
 main(int argc, char **argv)
 {
 	struct module *mod;
 	struct buffer buf = { };
 	char fname[SZ];
+	char *read_dumpfile = NULL, *write_dumpfile = NULL;
+	int opt;
+
+	while ((opt = getopt(argc, argv, "i:o:")) != -1) {
+		switch(opt) {
+			case 'i':
+				read_dumpfile = optarg;
+				modversions = 1;
+				have_vmlinux = 1;
+				break;
+			case 'o':
+				write_dumpfile = optarg;
+				break;
+			default:
+				exit(1);
+		}
+	}
+
+	if (read_dumpfile) {
+		FILE *file = fopen(read_dumpfile, "r");
+		if (!file) {
+			perror(read_dumpfile);
+			exit(1);
+		}
+		read_dump(file);
+		if (fclose(file) != 0) {
+			perror(read_dumpfile);
+			exit(1);
+		}
+	}
 
-	for (; argv[1]; argv++) {
-		read_symbols(argv[1]);
+	while (optind < argc) {
+		read_symbols(argv[optind++]);
 	}
 
 	for (mod = modules; mod; mod = mod->next) {
-		if (is_vmlinux(mod->name))
+		if (mod->skip)
 			continue;
 
 		buf.pos = 0;
@@ -566,6 +652,20 @@ main(int argc, char **argv)
 		sprintf(fname, "%s.mod.c", mod->name);
 		write_if_changed(&buf, fname);
 	}
+
+	if (write_dumpfile) {
+		FILE *file = fopen(write_dumpfile, "w");
+		if (!file) {
+			perror(write_dumpfile);
+			exit(1);
+		}
+		write_dump(file);
+		if (fclose(file) != 0) {
+			perror(write_dumpfile);
+			exit(1);
+		}
+	}
+
 	return 0;
 }
 
Index: linux-2.6.1/scripts/modpost.h
===================================================================
--- linux-2.6.1.orig/scripts/modpost.h
+++ linux-2.6.1/scripts/modpost.h
@@ -70,6 +70,7 @@ struct module {
 	const char *name;
 	struct symbol *unres;
 	int seen;
+	int skip;
 	struct buffer dev_table_buf;
 };
 
Index: linux-2.6.1/scripts/Makefile.modinst
===================================================================
--- linux-2.6.1.orig/scripts/Makefile.modinst
+++ linux-2.6.1/scripts/Makefile.modinst
@@ -29,11 +29,13 @@ quiet_cmd_modules_install = INSTALL $@
 $(filter-out ../% /%,$(modules)):
 	$(call cmd,modules_install)
 
-# Modules built outside just go into extra
+# Modules built outside go into extra by default
 
-quiet_cmd_modules_install_extra = INSTALL $(obj-m:.o=.ko)
-      cmd_modules_install_extra = mkdir -p $(MODLIB)/extra; \
-			    	  cp $@ $(MODLIB)/extra
+MOD_DIR ?= extra
+
+quiet_cmd_modules_install_extra = INSTALL $(@F)
+      cmd_modules_install_extra = mkdir -p $(MODLIB)/$(MOD_DIR); \
+			    	  cp $@ $(MODLIB)/$(MOD_DIR)
 
 $(filter     ../% /%,$(modules)):
 	$(call cmd,modules_install_extra)
Index: linux-2.6.1/scripts/Makefile.modpost
===================================================================
--- linux-2.6.1.orig/scripts/Makefile.modpost
+++ linux-2.6.1/scripts/Makefile.modpost
@@ -51,11 +51,21 @@ $(modules:.ko=.mod.c): __modpost ;
 
 # Extract all checksums for all exported symbols
 
-quiet_cmd_modpost = MODPOST
-      cmd_modpost = scripts/modpost $(filter-out FORCE,$^)
+# Are we building out-of-tree modules?
 
+ifeq ($(filter ../% /%,$(SUBDIRS)),)
+modver_file := modversions
+quiet_cmd_modpost = MODPOST
+      cmd_modpost = scripts/modpost $(filter-out FORCE,$^) -o $(modver_file)
 __modpost: $(wildcard vmlinux) $(modules:.ko=.o) FORCE
 	$(call if_changed,modpost)
+else
+modver_file := $(wildcard modversions)
+quiet_cmd_modpost = MODPOST
+      cmd_modpost = scripts/modpost $^ $(if $(modver_file),-i $(modver_file))
+__modpost: $(modules:.ko=.o)
+	$(call cmd,modpost)
+endif
 
 targets += __modpost