Date:	Sun, 25 Jul 2010 23:40:21 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	lkml <linux-kernel@...r.kernel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Michal Marek <mmarek@...e.cz>,
	Uwe Kleine-Koig <u.kleine-koenig@...gutronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4/4] kconfig: add savedefconfig

>From 5edffcc6890a7dbd43b8da9c453bee794e81e7c7 Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@...nborg.org>
Date: Sun, 25 Jul 2010 23:18:47 +0200
Subject: [PATCH 4/4] kconfig: add savedefconfig
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit

savedefconfig is used to save a minimal configuration
that is useful for a defconfig.

Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
---
 scripts/kconfig/Makefile    |    7 +++-
 scripts/kconfig/conf.c      |   20 ++++++++-
 scripts/kconfig/confdata.c  |   94 ++++++++++++++++++++++++++++++++++++++++++
 scripts/kconfig/lkc.h       |    2 +
 scripts/kconfig/lkc_proto.h |    1 +
 scripts/kconfig/symbol.c    |   96 +++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 217 insertions(+), 3 deletions(-)

diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index 366711a..aeb04c2 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -95,7 +95,8 @@ update-po-config: $(obj)/kxgettext $(obj)/gconf.glade.h
 	$(Q)rm -f arch/um/Kconfig.arch
 	$(Q)rm -f $(obj)/config.pot
 
-PHONY += randconfig allyesconfig allnoconfig allmodconfig alldefconfig defconfig
+PHONY += randconfig allyesconfig allnoconfig allmodconfig alldefconfig
+PHONY += defconfig savedefconfig
 
 randconfig: $(obj)/conf
 	$< -r $(Kconfig)
@@ -112,6 +113,9 @@ allmodconfig: $(obj)/conf
 alldefconfig: $(obj)/conf
 	$< -f $(Kconfig)
 
+savedefconfig: $(obj)/conf
+	$< -M defconfig $(Kconfig)
+
 defconfig: $(obj)/conf
 ifeq ($(KBUILD_DEFCONFIG),)
 	$< -d $(Kconfig)
@@ -140,6 +144,7 @@ help:
 	@echo  '  allmodconfig	  - New config selecting modules when possible'
 	@echo  '  allyesconfig	  - New config where all options are accepted with yes'
 	@echo  '  allnoconfig	  - New config where all options are answered with no'
+	@echo  '  savedefconfig   - Save current config as ./defconfig (minimal config)'
 
 # lxdialog stuff
 check-lxdialog  := $(srctree)/$(src)/lxdialog/check-lxdialog.sh
diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 2b4775e..b1a903b 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -28,7 +28,8 @@ enum {
 	set_mod,
 	set_no,
 	set_default,
-	set_random
+	set_random,
+	save_defconfig,
 } input_mode = ask_all;
 char *defconfig_file;
 
@@ -440,7 +441,7 @@ int main(int ac, char **av)
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);
 
-	while ((opt = getopt(ac, av, "osdD:nmyfrh")) != -1) {
+	while ((opt = getopt(ac, av, "osdD:nmM:yfrh")) != -1) {
 		switch (opt) {
 		case 'o':
 			input_mode = ask_silent;
@@ -485,6 +486,10 @@ int main(int ac, char **av)
 			input_mode = set_random;
 			break;
 		}
+		case 'M':
+			input_mode = save_defconfig;
+			defconfig_file = optarg;
+			break;
 		case 'h':
 			printf(_("See README for usage info\n"));
 			exit(0);
@@ -553,6 +558,9 @@ int main(int ac, char **av)
 		else if (!stat("all.config", &tmpstat))
 			conf_read_simple("all.config", S_DEF_USER);
 		break;
+	case save_defconfig:
+		conf_read(NULL);
+		break;
 	default:
 		break;
 	}
@@ -601,6 +609,8 @@ int main(int ac, char **av)
 			check_conf(&rootmenu);
 		} while (conf_cnt);
 		break;
+	case save_defconfig:
+		break;
 	}
 
 	if (sync_kconfig) {
@@ -615,6 +625,12 @@ int main(int ac, char **av)
 			fprintf(stderr, _("\n*** Error during update of the kernel configuration.\n\n"));
 			return 1;
 		}
+	} else if (input_mode == save_defconfig) {
+		if (conf_write_defconfig(defconfig_file)) {
+			fprintf(stderr, _("\n*** Error during writing of mini config to %s.\n\n"),
+			        defconfig_file);
+			return 1;
+		}
 	} else {
 		if (conf_write(NULL)) {
 			fprintf(stderr, _("\n*** Error during writing of the kernel configuration.\n\n"));
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index c4dec80..76c4e23 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -396,6 +396,100 @@ int conf_read(const char *name)
 	return 0;
 }
 
+/*
+ * Write out a minimal config.
+ * All values that has default values are skipped as this is redundant.
+ */
+int conf_write_defconfig(const char *filename)
+{
+	struct symbol *sym;
+	const char *str;
+	FILE *out;
+	int i, l;
+
+	out = fopen(filename, "w");
+	if (!out)
+		return 1;
+
+	sym_clear_all_valid();
+
+	for_all_symbols(i, sym) {
+		sym_calc_value(sym);
+		if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
+			goto next_symbol;
+		/* If we cannot change the symbol - skip */
+		if (!sym_is_changable(sym))
+			goto next_symbol;
+		/* If symbol equals to default value - skip */
+		if (strcmp(sym_get_string_value(sym), sym_get_string_default(sym)) == 0)
+			goto next_symbol;
+
+		/* choice symbols does not have a value - skip */
+		if (sym_is_choice(sym))
+			goto next_symbol;
+		/*
+		 * If symbol is a choice value and equals to the
+		 * default for a choice - skip.
+		 * But only if value equal to "y".
+		 */
+		if (sym_is_choice_value(sym)) {
+			struct symbol *cs;
+			struct symbol *ds;
+
+			cs = prop_get_symbol(sym_get_choice_prop(sym));
+			ds = sym_choice_default(cs);
+			if (sym == ds) {
+				if ((sym->type == S_BOOLEAN ||
+				     sym->type == S_TRISTATE) &&
+				     sym_get_tristate_value(sym) == yes)
+					goto next_symbol;
+			}
+		}
+		switch (sym->type) {
+		case S_BOOLEAN:
+		case S_TRISTATE:
+			switch (sym_get_tristate_value(sym)) {
+			case no:
+				fprintf(out, "# CONFIG_%s is not set\n", sym->name);
+				break;
+			case yes:
+				fprintf(out, "CONFIG_%s=y\n", sym->name);
+				break;
+			case mod:
+				fprintf(out, "CONFIG_%s=m\n", sym->name);
+				break;
+			}
+			break;
+		case S_STRING:
+			str = sym_get_string_value(sym);
+			fprintf(out, "CONFIG_%s=\"", sym->name);
+			while (1) {
+				l = strcspn(str, "\"\\");
+				if (l) {
+					fwrite(str, l, 1, out);
+					str += l;
+				}
+				if (!*str)
+					break;
+				fprintf(out, "\\%c", *str++);
+			}
+			fputs("\"\n", out);
+			break;
+		case S_HEX:
+		case S_INT:
+			str = sym_get_string_value(sym);
+			fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
+			break;
+		default:
+			break;
+		}
+next_symbol:
+		;
+	}
+	fclose(out);
+	return 0;
+}
+
 int conf_write(const char *name)
 {
 	FILE *out;
diff --git a/scripts/kconfig/lkc.h b/scripts/kconfig/lkc.h
index ce6549c..76db065 100644
--- a/scripts/kconfig/lkc.h
+++ b/scripts/kconfig/lkc.h
@@ -126,6 +126,8 @@ void sym_init(void);
 void sym_clear_all_valid(void);
 void sym_set_all_changed(void);
 void sym_set_changed(struct symbol *sym);
+struct symbol *sym_choice_default(struct symbol *sym);
+const char *sym_get_string_default(struct symbol *sym);
 struct symbol *sym_check_deps(struct symbol *sym);
 struct property *prop_alloc(enum prop_type type, struct symbol *sym);
 struct symbol *prop_get_symbol(struct property *prop);
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
index 7cadcad..e30d5f2 100644
--- a/scripts/kconfig/lkc_proto.h
+++ b/scripts/kconfig/lkc_proto.h
@@ -4,6 +4,7 @@ P(conf_parse,void,(const char *name));
 P(conf_read,int,(const char *name));
 P(conf_read_simple,int,(const char *name, int));
 P(conf_write,int,(const char *name));
+P(conf_write_defconfig,int,(const char *name));
 P(conf_write_autoconf,int,(void));
 P(conf_get_changed,bool,(void));
 P(conf_set_changed_callback, void,(void (*fn)(void)));
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index 0ea9c46..0bda646 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -216,6 +216,41 @@ static void sym_calc_visibility(struct symbol *sym)
 	}
 }
 
+/*
+ * Find the default isymbol for a choice.
+ * First try the default values for the choice symbol
+ * Next locate the first visible choice value
+ * Return NULL if none was found
+ */
+struct symbol *sym_choice_default(struct symbol *sym)
+{
+	struct property *prop;
+	struct symbol *def_sym;
+	struct expr *e;
+
+	/* any of the defaults visible? */
+	for_all_defaults(sym, prop) {
+		prop->visible.tri = expr_calc_value(prop->visible.expr);
+		if (prop->visible.tri == no)
+			continue;
+		def_sym = prop_get_symbol(prop);
+		sym_calc_visibility(def_sym);
+		if (def_sym->visible != no)
+			return def_sym;
+	}
+
+	/* just get the first visible value */
+	prop = sym_get_choice_prop(sym);
+	expr_list_for_each_sym(prop->expr, e, def_sym) {
+		sym_calc_visibility(def_sym);
+		if (def_sym->visible != no)
+			return def_sym;
+	}
+
+	/* failed to locate any defaults */
+	return NULL;
+}
+
 static struct symbol *sym_calc_choice(struct symbol *sym)
 {
 	struct symbol *def_sym;
@@ -646,6 +681,67 @@ const char *sym_get_string_value(struct symbol *sym)
 	return (const char *)sym->curr.val;
 }
 
+/*
+ * Find the default value associated to a symbol.
+ * For tristate symbol hande the modules=n case
+ * in which case "m" bocomes "y".
+ * If the symbol does not have any default fallback
+ * to the fixed default values.
+ */
+const char *sym_get_string_default(struct symbol *sym)
+{
+	struct property *prop;
+	struct symbol *ds;
+	tristate val;
+
+	prop = sym_get_default_prop(sym);
+	if (!prop)
+		goto default_value;
+	ds = prop_get_symbol(prop);
+	if (!ds)
+		goto default_value;
+
+	switch (sym->type) {
+	case S_BOOLEAN:
+	case S_TRISTATE:
+		val = sym_get_tristate_value(ds);
+		switch (val) {
+		case no:
+			return "n";
+		case yes:
+			return "y";
+		case mod:
+			if (sym_is_choice_value(sym))
+				return "m";
+			sym_calc_value(modules_sym);
+			if (modules_sym->curr.tri == no)
+				return "y";
+			else
+				return "m";
+		}
+		break;
+	default:
+		return (const char *)ds->curr.val;
+	}
+
+default_value:
+
+	switch (sym->type) {
+	case S_BOOLEAN:
+	case S_TRISTATE:
+		return "n";
+	case S_INT:
+	case S_HEX:
+		return "0";
+	case S_STRING:
+		return "";
+	case S_OTHER:
+	case S_UNKNOWN:
+		break;
+	}
+	return "";
+}
+
 bool sym_is_changable(struct symbol *sym)
 {
 	return sym->visible > sym->rev_dep.tri;
-- 
1.6.0.6

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