diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt
index f5b9493..0e966e8 100644
--- a/Documentation/kbuild/kconfig-language.txt
+++ b/Documentation/kbuild/kconfig-language.txt
@@ -198,14 +198,6 @@ applicable everywhere (see syntax).
     enables the third modular state for all config symbols.
     At most one symbol may have the "modules" option set.
 
-  - "env"=<value>
-    This imports the environment variable into Kconfig. It behaves like
-    a default, except that the value comes from the environment, this
-    also means that the behaviour when mixing it with normal defaults is
-    undefined at this point. The symbol is currently not exported back
-    to the build environment (if this is desired, it can be done via
-    another symbol).
-
   - "allnoconfig_y"
     This declares the symbol as one that should have the value y when
     using "allnoconfig". Used for symbols that hide other symbols.
diff --git a/Kconfig b/Kconfig
index 8c4c1cb..e6ece5b 100644
--- a/Kconfig
+++ b/Kconfig
@@ -5,8 +5,4 @@
 #
 mainmenu "Linux/$ARCH $KERNELVERSION Kernel Configuration"
 
-config SRCARCH
-	string
-	option env="SRCARCH"
-
 source "arch/$SRCARCH/Kconfig"
diff --git a/Makefile b/Makefile
index 5c395ed..4ae1486 100644
--- a/Makefile
+++ b/Makefile
@@ -284,7 +284,8 @@ include scripts/Kbuild.include
 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
-export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
+UNAME_RELEASE := $(shell uname --release)
+export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION UNAME_RELEASE
 
 # SUBARCH tells the usermode build what the underlying arch is.  That is set
 # first, and if a usermode build is happening, the "ARCH=um" on the command
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 97fe293..14f3ef1 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -57,7 +57,7 @@ config SUPERH
 	  <http://www.linux-sh.org/>.
 
 config SUPERH32
-	def_bool ARCH = "sh"
+	def_bool "$ARCH" = "sh"
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
 	select HAVE_IOREMAP_PROT if MMU && !X2TLB
@@ -76,7 +76,7 @@ config SUPERH32
 	select HAVE_CC_STACKPROTECTOR
 
 config SUPERH64
-	def_bool ARCH = "sh64"
+	def_bool "$ARCH" = "sh64"
 	select HAVE_EXIT_THREAD
 	select KALLSYMS
 
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 8767e45..86b852e 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -1,6 +1,6 @@
 config 64BIT
-	bool "64-bit kernel" if ARCH = "sparc"
-	default ARCH = "sparc64"
+	bool "64-bit kernel" if "$ARCH" = "sparc"
+	default "$ARCH" = "sparc64"
 	help
 	  SPARC is a family of RISC microprocessors designed and marketed by
 	  Sun Microsystems, incorporated.  They are very widely found in Sun
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index ef9d403..acc2182 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -119,7 +119,7 @@ config HVC_TILE
 # Building with ARCH=tilegx (or ARCH=tile) implies using the
 # 64-bit TILE-Gx toolchain, so force CONFIG_TILEGX on.
 config TILEGX
-	def_bool ARCH != "tilepro"
+	def_bool "$ARCH" != "tilepro"
 	select ARCH_SUPPORTS_ATOMIC_RMW
 	select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
 	select HAVE_ARCH_JUMP_LABEL
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index c68add8..07f84c8 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -54,10 +54,6 @@ config HZ
 	int
 	default 100
 
-config SUBARCH
-	string
-	option env="SUBARCH"
-
 config NR_CPUS
 	int
 	range 1 1
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0fa71a7..986fb0a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1,8 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 # Select 32 or 64 bit
 config 64BIT
-	bool "64-bit kernel" if ARCH = "x86"
-	default ARCH != "i386"
+	bool "64-bit kernel" if "$ARCH" = "x86"
+	default "$ARCH" != "i386"
 	---help---
 	  Say yes to build a 64-bit kernel - formerly known as x86_64
 	  Say no to build a 32-bit kernel - formerly known as i386
diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index 13ed827..d355413 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -16,8 +16,8 @@ config UML_X86
 	select GENERIC_FIND_FIRST_BIT
 
 config 64BIT
-	bool "64-bit kernel" if SUBARCH = "x86"
-	default SUBARCH != "i386"
+	bool "64-bit kernel" if $SUBARCH = "x86"
+	default $SUBARCH != "i386"
 
 config X86_32
 	def_bool !64BIT
diff --git a/init/Kconfig b/init/Kconfig
index df18492..b4814e6 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1,11 +1,3 @@
-config ARCH
-	string
-	option env="ARCH"
-
-config KERNELVERSION
-	string
-	option env="KERNELVERSION"
-
 config DEFCONFIG_LIST
 	string
 	depends on !UML
@@ -13,7 +5,7 @@ config DEFCONFIG_LIST
 	default "/lib/modules/$UNAME_RELEASE/.config"
 	default "/etc/kernel-config"
 	default "/boot/config-$UNAME_RELEASE"
-	default "$ARCH_DEFCONFIG"
+	default ARCH_DEFCONFIG
 	default "arch/$ARCH/defconfig"
 
 config CONSTRUCTORS
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index df26c7b..98c2014 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -81,39 +81,13 @@ const char *conf_get_autoconfig_name(void)
 	return name ? name : "include/config/auto.conf";
 }
 
-static char *conf_expand_value(const char *in)
-{
-	struct symbol *sym;
-	const char *src;
-	static char res_value[SYMBOL_MAXLENGTH];
-	char *dst, name[SYMBOL_MAXLENGTH];
-
-	res_value[0] = 0;
-	dst = name;
-	while ((src = strchr(in, '$'))) {
-		strncat(res_value, in, src - in);
-		src++;
-		dst = name;
-		while (isalnum(*src) || *src == '_')
-			*dst++ = *src++;
-		*dst = 0;
-		sym = sym_lookup(name, 0);
-		sym_calc_value(sym);
-		strcat(res_value, sym_get_string_value(sym));
-		in = src;
-	}
-	strcat(res_value, in);
-
-	return res_value;
-}
-
 char *conf_get_default_confname(void)
 {
 	struct stat buf;
 	static char fullname[PATH_MAX+1];
 	char *env, *name;
 
-	name = conf_expand_value(conf_defname);
+	name = expand_string_value(conf_defname);
 	env = getenv(SRCTREE);
 	if (env) {
 		sprintf(fullname, "%s/%s", env, name);
@@ -274,7 +248,8 @@ int conf_read_simple(const char *name, int def)
 			if (expr_calc_value(prop->visible.expr) == no ||
 			    prop->expr->type != E_SYMBOL)
 				continue;
-			name = conf_expand_value(prop->expr->left.sym->name);
+			sym_calc_value(prop->expr->left.sym);
+			name = sym_get_string_value(prop->expr->left.sym);
 			in = zconf_fopen(name);
 			if (in) {
 				conf_message(_("using defaults found in %s"),
diff --git a/scripts/kconfig/env.c b/scripts/kconfig/env.c
new file mode 100644
index 0000000..9702f5c
--- /dev/null
+++ b/scripts/kconfig/env.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>
+
+static LIST_HEAD(env_list);
+
+struct env {
+	char *name;
+	char *value;
+	struct list_head node;
+};
+
+static struct env *env_list_lookup(const char *name)
+{
+	struct env *e;
+
+	list_for_each_entry(e, &env_list, node) {
+		if (!strcmp(name, e->name))
+			return e;
+	}
+
+	return NULL;
+}
+
+static void env_list_add(const char *name, const char *value)
+{
+	struct env *e;
+
+	e = xmalloc(sizeof(*e));
+	e->name = xstrdup(name);
+	e->value = xstrdup(value);
+
+	list_add_tail(&e->node, &env_list);
+}
+
+static void env_list_del(struct env *e)
+{
+	list_del(&e->node);
+	free(e->name);
+	free(e->value);
+	free(e);
+}
+
+/* the returned pointer must be freed when done */
+static char *env_expand(const char *name)
+{
+	struct env *e;
+	const char *value;
+
+	e = env_list_lookup(name);
+	if (e)
+		return xstrdup(e->value);
+
+	value = getenv(name);
+	if (!value) {
+		fprintf(stderr, "environment variable \"%s\" undefined\n", name);
+		value = "";
+	}
+
+	/*
+	 * we need to remember all referenced environments.
+	 * They will be written out to include/config/auto.conf.cmd
+	 */
+	env_list_add(name, value);
+
+	return xstrdup(value);
+}
+
+/* works like env_expand, but 'name' does not need to be null-terminated */
+char *env_expand_n(const char *name, size_t n)
+{
+	char *tmp, *res;
+
+	tmp = xmalloc(n + 1);
+	memcpy(tmp, name, n);
+	*(tmp + n) = '\0';
+
+	res = env_expand(tmp);
+
+	free(tmp);
+
+	return res;
+}
+
+void env_write_dep(FILE *f, const char *autoconfig_name)
+{
+	struct env *env, *tmp;
+
+	list_for_each_entry_safe(env, tmp, &env_list, node) {
+		fprintf(f, "ifneq \"$(%s)\" \"%s\"\n", env->name, env->value);
+		fprintf(f, "%s: FORCE\n", autoconfig_name);
+		fprintf(f, "endif\n");
+		env_list_del(env);
+	}
+}
diff --git a/scripts/kconfig/kconf_id.c b/scripts/kconfig/kconf_id.c
index 3ea9c5f..b3e0ea0 100644
--- a/scripts/kconfig/kconf_id.c
+++ b/scripts/kconfig/kconf_id.c
@@ -32,7 +32,6 @@ static struct kconf_id kconf_id_array[] = {
 	{ "on",			T_ON,			TF_PARAM },
 	{ "modules",		T_OPT_MODULES,		TF_OPTION },
 	{ "defconfig_list",	T_OPT_DEFCONFIG_LIST,	TF_OPTION },
-	{ "env",		T_OPT_ENV,		TF_OPTION },
 	{ "allnoconfig_y",	T_OPT_ALLNOCONFIG_Y,	TF_OPTION },
 };
 
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index c8d9e55..03d007f 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -58,7 +58,6 @@ enum conf_def_mode {
 
 #define T_OPT_MODULES		1
 #define T_OPT_DEFCONFIG_LIST	2
-#define T_OPT_ENV		3
 #define T_OPT_ALLNOCONFIG_Y	4
 
 struct kconf_id {
@@ -95,6 +94,10 @@ static inline void xfwrite(const void *str, size_t len, size_t count, FILE *out)
 		fprintf(stderr, "Error in writing or end of file.\n");
 }
 
+/* env.c */
+char *env_expand_n(const char *name, size_t n);
+void env_write_dep(FILE *f, const char *auto_conf_name);
+
 /* menu.c */
 void _menu_init(void);
 void menu_warn(struct menu *menu, const char *fmt, ...);
@@ -135,9 +138,6 @@ void str_printf(struct gstr *gs, const char *fmt, ...);
 const char *str_get(struct gstr *gs);
 
 /* symbol.c */
-extern struct expr *sym_env_list;
-
-void sym_init(void);
 void sym_clear_all_valid(void);
 struct symbol *sym_choice_default(struct symbol *sym);
 const char *sym_get_string_default(struct symbol *sym);
diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
index 5c5c137..8148305 100644
--- a/scripts/kconfig/menu.c
+++ b/scripts/kconfig/menu.c
@@ -214,9 +214,6 @@ void menu_add_option(int token, char *arg)
 			zconf_error("trying to redefine defconfig symbol");
 		sym_defconfig_list->flags |= SYMBOL_AUTO;
 		break;
-	case T_OPT_ENV:
-		prop_add_env(arg);
-		break;
 	case T_OPT_ALLNOCONFIG_Y:
 		current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
 		break;
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 03143b2..7c9a88e 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -33,33 +33,6 @@ struct symbol *sym_defconfig_list;
 struct symbol *modules_sym;
 tristate modules_val;
 
-struct expr *sym_env_list;
-
-static void sym_add_default(struct symbol *sym, const char *def)
-{
-	struct property *prop = prop_alloc(P_DEFAULT, sym);
-
-	prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));
-}
-
-void sym_init(void)
-{
-	struct symbol *sym;
-	struct utsname uts;
-	static bool inited = false;
-
-	if (inited)
-		return;
-	inited = true;
-
-	uname(&uts);
-
-	sym = sym_lookup("UNAME_RELEASE", 0);
-	sym->type = S_STRING;
-	sym->flags |= SYMBOL_AUTO;
-	sym_add_default(sym, uts.release);
-}
-
 enum symbol_type sym_get_type(struct symbol *sym)
 {
 	enum symbol_type type = sym->type;
@@ -1348,32 +1321,3 @@ const char *prop_get_type_name(enum prop_type type)
 	}
 	return "unknown";
 }
-
-static void prop_add_env(const char *env)
-{
-	struct symbol *sym, *sym2;
-	struct property *prop;
-	char *p;
-
-	sym = current_entry->sym;
-	sym->flags |= SYMBOL_AUTO;
-	for_all_properties(sym, prop, P_ENV) {
-		sym2 = prop_get_symbol(prop);
-		if (strcmp(sym2->name, env))
-			menu_warn(current_entry, "redefining environment symbol from %s",
-				  sym2->name);
-		return;
-	}
-
-	prop = prop_alloc(P_ENV, sym);
-	prop->expr = expr_alloc_symbol(sym_lookup(env, SYMBOL_CONST));
-
-	sym_env_list = expr_alloc_one(E_LIST, sym_env_list);
-	sym_env_list->right.sym = sym;
-
-	p = getenv(env);
-	if (p)
-		sym_add_default(sym, p);
-	else
-		menu_warn(current_entry, "environment variable %s undefined", env);
-}
diff --git a/scripts/kconfig/util.c b/scripts/kconfig/util.c
index 22201a4..136e497 100644
--- a/scripts/kconfig/util.c
+++ b/scripts/kconfig/util.c
@@ -8,16 +8,18 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
+
+#include "list.h"
 #include "lkc.h"
 
 /*
- * Expand symbol's names embedded in the string given in argument. Symbols'
- * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to
+ * Expand environments embedded in the string given in argument. Environments
+ * to be expanded shall be prefixed by a '$'. Unknown environment expands to
  * the empty string.
  */
 char *expand_string_value(const char *in)
 {
-	const char *src;
+	const char *p, *q;
 	char *res;
 	size_t reslen;
 
@@ -25,39 +27,28 @@ char *expand_string_value(const char *in)
 	 * Note: 'in' might come from a token that's about to be
 	 * freed, so make sure to always allocate a new string
 	 */
-	reslen = strlen(in) + 1;
-	res = xmalloc(reslen);
-	res[0] = '\0';
-
-	while ((src = strchr(in, '$'))) {
-		char *p, name[SYMBOL_MAXLENGTH];
-		const char *symval = "";
-		struct symbol *sym;
-		size_t newlen;
-
-		strncat(res, in, src - in);
-		src++;
-
-		p = name;
-		while (isalnum(*src) || *src == '_')
-			*p++ = *src++;
-		*p = '\0';
-
-		sym = sym_find(name);
-		if (sym != NULL) {
-			sym_calc_value(sym);
-			symval = sym_get_string_value(sym);
-		}
+	res = xmalloc(1);
+	*res = '\0';
 
-		newlen = strlen(res) + strlen(symval) + strlen(src) + 1;
-		if (newlen > reslen) {
-			reslen = newlen;
-			res = xrealloc(res, reslen);
-		}
+	while ((p = strchr(in, '$'))) {
+		char *new;
+
+		q = p + 1;
+		while (isalnum(*q) || *q == '_')
+			q++;
 
-		strcat(res, symval);
-		in = src;
+		new = env_expand_n(p + 1, q - p - 1);
+
+		reslen = strlen(res) + (p - in) + strlen(new) + 1;
+		res = xrealloc(res, reslen);
+		strncat(res, in, p - in);
+		strcat(res, new);
+		free(new);
+		in = q;
 	}
+
+	reslen = strlen(res) + strlen(in) + 1;
+	res = xrealloc(res, reslen);
 	strcat(res, in);
 
 	return res;
@@ -87,8 +78,6 @@ struct file *file_lookup(const char *name)
 /* write a dependency file as used by kbuild to track dependencies */
 int file_write_dep(const char *name)
 {
-	struct symbol *sym, *env_sym;
-	struct expr *e;
 	struct file *file;
 	FILE *out;
 
@@ -107,21 +96,7 @@ int file_write_dep(const char *name)
 	fprintf(out, "\n%s: \\\n"
 		     "\t$(deps_config)\n\n", conf_get_autoconfig_name());
 
-	expr_list_for_each_sym(sym_env_list, e, sym) {
-		struct property *prop;
-		const char *value;
-
-		prop = sym_get_env_prop(sym);
-		env_sym = prop_get_symbol(prop);
-		if (!env_sym)
-			continue;
-		value = getenv(env_sym->name);
-		if (!value)
-			value = "";
-		fprintf(out, "ifneq \"$(%s)\" \"%s\"\n", env_sym->name, value);
-		fprintf(out, "%s: FORCE\n", conf_get_autoconfig_name());
-		fprintf(out, "endif\n");
-	}
+	env_write_dep(out, conf_get_autoconfig_name());
 
 	fprintf(out, "\n$(deps_config): ;\n");
 	fclose(out);
diff --git a/scripts/kconfig/zconf.l b/scripts/kconfig/zconf.l
index 045093d..551ca47 100644
--- a/scripts/kconfig/zconf.l
+++ b/scripts/kconfig/zconf.l
@@ -35,6 +35,7 @@ struct buffer *current_buf;
 
 static int last_ts, first_ts;
 
+static void expand_string(const char *in);
 static void zconf_endhelp(void);
 static void zconf_endfile(void);
 
@@ -120,6 +121,7 @@ n	[A-Za-z0-9_-]
 }
 
 <PARAM>{
+	"$".*	expand_string(yytext);
 	"&&"	return T_AND;
 	"||"	return T_OR;
 	"("	return T_OPEN_PAREN;
@@ -157,12 +159,13 @@ n	[A-Za-z0-9_-]
 }
 
 <STRING>{
-	[^'"\\\n]+/\n	{
+	"$".*	expand_string(yytext);
+	[^$'"\\\n]+/\n	{
 		append_string(yytext, yyleng);
 		yylval.string = text;
 		return T_WORD_QUOTE;
 	}
-	[^'"\\\n]+	{
+	[^$'"\\\n]+	{
 		append_string(yytext, yyleng);
 	}
 	\\.?/\n	{
@@ -249,6 +252,19 @@ n	[A-Za-z0-9_-]
 }
 
 %%
+static void expand_string(const char *in)
+{
+	char *p, *q;
+
+	p = expand_string_value(in);
+
+	q = p + strlen(p);
+	while (q > p)
+		unput(*--q);
+
+	free(p);
+}
+
 void zconf_starthelp(void)
 {
 	new_string();
diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y
index 262c464..4ff4ac9 100644
--- a/scripts/kconfig/zconf.y
+++ b/scripts/kconfig/zconf.y
@@ -534,7 +534,6 @@ void conf_parse(const char *name)
 
 	zconf_initscan(name);
 
-	sym_init();
 	_menu_init();
 
 	if (getenv("ZCONF_DEBUG"))
@@ -775,6 +774,7 @@ void zconfdump(FILE *out)
 }
 
 #include "zconf.lex.c"
+#include "env.c"
 #include "util.c"
 #include "confdata.c"
 #include "expr.c"
