7 files changed, 156 insertions, 73 deletions

diff --git a/Makefile b/Makefile
index a3a7baad8555..b1610562a65f 100644
--- a/Makefile
+++ b/Makefile
@@ -404,7 +404,7 @@ include $(srctree)/arch/$(ARCH)/Makefile
 export KBUILD_DEFCONFIG
 
 config %config: scripts_basic outputmakefile FORCE
-        $(Q)mkdir -p include/linux
+        $(Q)mkdir -p include/linux include/config
         $(Q)$(MAKE) $(build)=scripts/kconfig $@
         $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
 
@@ -421,8 +421,6 @@ PHONY += scripts
 scripts: scripts_basic include/config/MARKER
         $(Q)$(MAKE) $(build)=$(@)
 
-scripts_basic: include/linux/autoconf.h
-
 # Objects we will link into vmlinux / subdirs we need to visit
 init-y          := init/
 drivers-y       := drivers/ sound/
@@ -436,25 +434,22 @@ ifeq ($(dot-config),1)
 
 # Read in dependencies to all Kconfig* files, make sure to run
 # oldconfig if changes are detected.
--include .kconfig.d
-
-include .config
+-include include/config/auto.conf.cmd
+-include include/config/auto.conf
 
-# If .config needs to be updated, it will be done via the dependency
-# that autoconf has on .config.
 # To avoid any implicit rule to kick in, define an empty command
-.config .kconfig.d: ;
+.config include/config/auto.conf.cmd: ;
 
-# If .config is newer than include/linux/autoconf.h, someone tinkered
+# If .config is newer than include/config/auto.conf, someone tinkered
 # with it and forgot to run make oldconfig.
-# If kconfig.d is missing then we are probarly in a cleaned tree so
+# if auto.conf.cmd is missing then we are probarly in a cleaned tree so
 # we execute the config step to be sure to catch updated Kconfig files
-include/linux/autoconf.h: .kconfig.d .config
-        $(Q)mkdir -p include/linux
+include/config/auto.conf: .config include/config/auto.conf.cmd
         $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
+
 else
 # Dummy target needed, because used as prerequisite
-include/linux/autoconf.h: ;
+include/config/auto.conf: ;
 endif
 
 # The all: target is the default when no target is given on the
@@ -779,7 +774,7 @@ PHONY += prepare-all
 prepare3: .kernelrelease
 ifneq ($(KBUILD_SRC),)
         @echo '  Using $(srctree) as source for kernel'
-        $(Q)if [ -f $(srctree)/.config ]; then \
+        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
                 echo "  $(srctree) is not clean, please run 'make mrproper'";\
                 echo "  in the '$(srctree)' directory.";\
                 /bin/false; \
@@ -822,7 +817,7 @@ include/asm:
 
 #       Split autoconf.h into include/linux/config/*
 
-include/config/MARKER: scripts/basic/split-include include/linux/autoconf.h
+include/config/MARKER: scripts/basic/split-include include/config/auto.conf
         @echo '  SPLIT   include/linux/autoconf.h -> include/config/*'
         @scripts/basic/split-include include/linux/autoconf.h include/config
         @touch $@
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index e48e60da3040..53e53a2e80ae 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -8,7 +8,7 @@ PHONY := __build
 __build:
 
 # Read .config if it exist, otherwise ignore
--include .config
+-include include/config/auto.conf
 
 include scripts/Kbuild.include
 
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index 0e056cffffdb..576cce5e387f 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -35,7 +35,7 @@
 PHONY := _modpost
 _modpost: __modpost
 
-include .config
+include include/config/auto.conf
 include scripts/Kbuild.include
 include scripts/Makefile.lib
 
diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 8012d1076876..9334da65f364 100644
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -599,7 +599,15 @@ int main(int ac, char **av)
                         input_mode = ask_silent;
                         valid_stdin = 1;
                 }
-        }
+        } else if (sym_change_count) {
+                name = getenv("KCONFIG_NOSILENTUPDATE");
+                if (name && *name) {
+                        fprintf(stderr, _("\n*** Kernel configuration requires explicit update.\n\n"));
+                        return 1;
+                }
+        } else
+                goto skip_check;
+
         do {
                 conf_cnt = 0;
                 check_conf(&rootmenu);
@@ -608,5 +616,11 @@ int main(int ac, char **av)
                 fprintf(stderr, _("\n*** Error during writing of the kernel configuration.\n\n"));
                 return 1;
         }
+skip_check:
+        if (input_mode == ask_silent && conf_write_autoconf()) {
+                fprintf(stderr, _("\n*** Error during writing of the kernel configuration.\n\n"));
+                return 1;
+        }
+
         return 0;
 }
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index a9e3b6abf661..2da4a8d775a5 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -342,7 +342,7 @@ int conf_read(const char *name)
 
 int conf_write(const char *name)
 {
-        FILE *out, *out_h;
+        FILE *out;
         struct symbol *sym;
         struct menu *menu;
         const char *basename;
@@ -379,13 +379,6 @@ int conf_write(const char *name)
         out = fopen(newname, "w");
         if (!out)
                 return 1;
-        out_h = NULL;
-        if (!name) {
-                out_h = fopen(".tmpconfig.h", "w");
-                if (!out_h)
-                        return 1;
-                file_write_dep(NULL);
-        }
         sym = sym_lookup("KERNELVERSION", 0);
         sym_calc_value(sym);
         time(&now);
@@ -401,16 +394,6 @@ int conf_write(const char *name)
                      sym_get_string_value(sym),
                      use_timestamp ? "# " : "",
                      use_timestamp ? ctime(&now) : "");
-        if (out_h)
-                fprintf(out_h, "/*\n"
-                               " * Automatically generated C config: don't edit\n"
-                               " * Linux kernel version: %s\n"
-                               "%s%s"
-                               " */\n"
-                               "#define AUTOCONF_INCLUDED\n",
-                               sym_get_string_value(sym),
-                               use_timestamp ? " * " : "",
-                               use_timestamp ? ctime(&now) : "");
 
         if (!sym_change_count)
                 sym_clear_all_valid();
@@ -426,11 +409,6 @@ int conf_write(const char *name)
                                      "#\n"
                                      "# %s\n"
                                      "#\n", str);
-                        if (out_h)
-                                fprintf(out_h, "\n"
-                                               "/*\n"
-                                               " * %s\n"
-                                               " */\n", str);
                 } else if (!(sym->flags & SYMBOL_CHOICE)) {
                         sym_calc_value(sym);
                         if (!(sym->flags & SYMBOL_WRITE))
@@ -448,59 +426,39 @@ int conf_write(const char *name)
                                 switch (sym_get_tristate_value(sym)) {
                                 case no:
                                         fprintf(out, "# CONFIG_%s is not set\n", sym->name);
-                                        if (out_h)
-                                                fprintf(out_h, "#undef CONFIG_%s\n", sym->name);
                                         break;
                                 case mod:
                                         fprintf(out, "CONFIG_%s=m\n", sym->name);
-                                        if (out_h)
-                                                fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
                                         break;
                                 case yes:
                                         fprintf(out, "CONFIG_%s=y\n", sym->name);
-                                        if (out_h)
-                                                fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
                                         break;
                                 }
                                 break;
                         case S_STRING:
-                                // fix me
                                 str = sym_get_string_value(sym);
                                 fprintf(out, "CONFIG_%s=\"", sym->name);
-                                if (out_h)
-                                        fprintf(out_h, "#define CONFIG_%s \"", sym->name);
-                                do {
+                                while (1) {
                                         l = strcspn(str, "\"\\");
                                         if (l) {
                                                 fwrite(str, l, 1, out);
-                                                if (out_h)
-                                                        fwrite(str, l, 1, out_h);
-                                        }
-                                        str += l;
-                                        while (*str == '\\' || *str == '"') {
-                                                fprintf(out, "\\%c", *str);
-                                                if (out_h)
-                                                        fprintf(out_h, "\\%c", *str);
-                                                str++;
+                                                str += l;
                                         }
-                                } while (*str);
+                                        if (!*str)
+                                                break;
+                                        fprintf(out, "\\%c", *str++);
+                                }
                                 fputs("\"\n", out);
-                                if (out_h)
-                                        fputs("\"\n", out_h);
                                 break;
                         case S_HEX:
                                 str = sym_get_string_value(sym);
                                 if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
                                         fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
-                                        if (out_h)
-                                                fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
                                         break;
                                 }
                         case S_INT:
                                 str = sym_get_string_value(sym);
                                 fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
-                                if (out_h)
-                                        fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
                                 break;
                         }
                 }
@@ -520,10 +478,6 @@ int conf_write(const char *name)
                 }
         }
         fclose(out);
-        if (out_h) {
-                fclose(out_h);
-                rename(".tmpconfig.h", "include/linux/autoconf.h");
-        }
         if (!name || basename != conf_def_filename) {
                 if (!name)
                         name = conf_def_filename;
@@ -542,3 +496,120 @@ int conf_write(const char *name)
 
         return 0;
 }
+
+int conf_write_autoconf(void)
+{
+        struct symbol *sym;
+        const char *str;
+        char *name;
+        FILE *out, *out_h;
+        time_t now;
+        int i, l;
+
+        file_write_dep("include/config/auto.conf.cmd");
+
+        out = fopen(".tmpconfig", "w");
+        if (!out)
+                return 1;
+
+        out_h = fopen(".tmpconfig.h", "w");
+        if (!out_h) {
+                fclose(out);
+                return 1;
+        }
+
+        sym = sym_lookup("KERNELVERSION", 0);
+        sym_calc_value(sym);
+        time(&now);
+        fprintf(out, "#\n"
+                     "# Automatically generated make config: don't edit\n"
+                     "# Linux kernel version: %s\n"
+                     "# %s"
+                     "#\n",
+                     sym_get_string_value(sym), ctime(&now));
+        fprintf(out_h, "/*\n"
+                       " * Automatically generated C config: don't edit\n"
+                       " * Linux kernel version: %s\n"
+                       " * %s"
+                       " */\n"
+                       "#define AUTOCONF_INCLUDED\n",
+                       sym_get_string_value(sym), ctime(&now));
+
+        sym_clear_all_valid();
+
+        for_all_symbols(i, sym) {
+                sym_calc_value(sym);
+                if (!(sym->flags & SYMBOL_WRITE) || !sym->name)
+                        continue;
+                switch (sym->type) {
+                case S_BOOLEAN:
+                case S_TRISTATE:
+                        switch (sym_get_tristate_value(sym)) {
+                        case no:
+                                break;
+                        case mod:
+                                fprintf(out, "CONFIG_%s=m\n", sym->name);
+                                fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
+                                break;
+                        case yes:
+                                fprintf(out, "CONFIG_%s=y\n", sym->name);
+                                fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
+                                break;
+                        }
+                        break;
+                case S_STRING:
+                        str = sym_get_string_value(sym);
+                        fprintf(out, "CONFIG_%s=\"", sym->name);
+                        fprintf(out_h, "#define CONFIG_%s \"", sym->name);
+                        while (1) {
+                                l = strcspn(str, "\"\\");
+                                if (l) {
+                                        fwrite(str, l, 1, out);
+                                        fwrite(str, l, 1, out_h);
+                                        str += l;
+                                }
+                                if (!*str)
+                                        break;
+                                fprintf(out, "\\%c", *str);
+                                fprintf(out_h, "\\%c", *str);
+                                str++;
+                        }
+                        fputs("\"\n", out);
+                        fputs("\"\n", out_h);
+                        break;
+                case S_HEX:
+                        str = sym_get_string_value(sym);
+                        if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
+                                fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
+                                fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
+                                break;
+                        }
+                case S_INT:
+                        str = sym_get_string_value(sym);
+                        fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
+                        fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
+                        break;
+                default:
+                        break;
+                }
+        }
+        fclose(out);
+        fclose(out_h);
+
+        name = getenv("KCONFIG_AUTOHEADER");
+        if (!name)
+                name = "include/linux/autoconf.h";
+        if (rename(".tmpconfig.h", name))
+                return 1;
+        name = getenv("KCONFIG_AUTOCONFIG");
+        if (!name)
+                name = "include/config/auto.conf";
+        /*
+         * This must be the last step, kbuild has a dependency on auto.conf
+         * and this marks the successful completion of the previous steps.
+         */
+        if (rename(".tmpconfig", name))
+                return 1;
+
+        return 0;
+}
diff --git a/scripts/kconfig/lkc_proto.h b/scripts/kconfig/lkc_proto.h
index b6a389c5fcbd..bd0fb1dc1322 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));
 P(conf_write,int,(const char *name));
+P(conf_write_autoconf,int,(void));
 
 /* menu.c */
 P(rootmenu,struct menu,);
diff --git a/scripts/kconfig/util.c b/scripts/kconfig/util.c
index 656d2c87d661..e3f28b9d59f4 100644
--- a/scripts/kconfig/util.c
+++ b/scripts/kconfig/util.c
@@ -44,7 +44,9 @@ int file_write_dep(const char *name)
                 else
                         fprintf(out, "\t%s\n", file->name);
         }
-        fprintf(out, "\n.config include/linux/autoconf.h: $(deps_config)\n\n$(deps_config):\n");
+        fprintf(out, "\ninclude/config/auto.conf: \\\n"
+                     "\t$(deps_config)\n\n"
+                     "$(deps_config): ;\n");
         fclose(out);
         rename("..config.tmp", name);
         return 0;