8 files changed, 129 insertions, 246 deletions

diff --git a/Makefile b/Makefile
index b1610562a65f..4b996c8fb70a 100644
--- a/Makefile
+++ b/Makefile
@@ -418,7 +418,7 @@ ifeq ($(KBUILD_EXTMOD),)
 # Carefully list dependencies so we do not try to build scripts twice
 # in parrallel
 PHONY += scripts
-scripts: scripts_basic include/config/MARKER
+scripts: scripts_basic include/config/auto.conf
         $(Q)$(MAKE) $(build)=$(@)
 
 # Objects we will link into vmlinux / subdirs we need to visit
@@ -787,7 +787,7 @@ endif
 prepare2: prepare3 outputmakefile
 
 prepare1: prepare2 include/linux/version.h include/asm \
-                   include/config/MARKER
+                   include/config/auto.conf
 ifneq ($(KBUILD_MODULES),)
         $(Q)mkdir -p $(MODVERDIR)
         $(Q)rm -f $(MODVERDIR)/*
@@ -815,13 +815,6 @@ include/asm:
         $(Q)if [ ! -d include ]; then mkdir -p include; fi;
         @ln -fsn asm-$(ARCH) $@
 
-#       Split autoconf.h into include/linux/config/*
-
-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 $@
-
 # Generate some files
 # ---------------------------------------------------------------------------
 
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 6f8e84c1c1f2..9791d870ae71 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -175,7 +175,7 @@ boot := arch/arm/boot
 #       them changed.  We use .arch to indicate when they were updated
 #       last, otherwise make uses the target directory mtime.
 
-include/asm-arm/.arch: $(wildcard include/config/arch/*.h) include/config/MARKER
+include/asm-arm/.arch: $(wildcard include/config/arch/*.h) include/config/auto.conf
         @echo '  SYMLINK include/asm-arm/arch -> include/asm-arm/$(INCDIR)'
 ifneq ($(KBUILD_SRC),)
         $(Q)mkdir -p include/asm-arm
diff --git a/arch/sh/Makefile b/arch/sh/Makefile
index c72e17a96eed..e467a450662b 100644
--- a/arch/sh/Makefile
+++ b/arch/sh/Makefile
@@ -147,7 +147,7 @@ endif
 #       them changed.  We use .arch and .mach to indicate when they were
 #       updated last, otherwise make uses the target directory mtime.
 
-include/asm-sh/.cpu: $(wildcard include/config/cpu/*.h) include/config/MARKER
+include/asm-sh/.cpu: $(wildcard include/config/cpu/*.h) include/config/auto.conf
         @echo '  SYMLINK include/asm-sh/cpu -> include/asm-sh/$(cpuincdir-y)'
         $(Q)if [ ! -d include/asm-sh ]; then mkdir -p include/asm-sh; fi
         $(Q)ln -fsn $(incdir-prefix)$(cpuincdir-y) include/asm-sh/cpu
@@ -157,7 +157,7 @@ include/asm-sh/.cpu: $(wildcard include/config/cpu/*.h) include/config/MARKER
 #       don't, just reference the parent directory so the semantics are
 #       kept roughly the same.
 
-include/asm-sh/.mach: $(wildcard include/config/sh/*.h) include/config/MARKER
+include/asm-sh/.mach: $(wildcard include/config/sh/*.h) include/config/auto.conf
         @echo -n '  SYMLINK include/asm-sh/mach -> '
         $(Q)if [ ! -d include/asm-sh ]; then mkdir -p include/asm-sh; fi
         $(Q)if [ -d $(incdir-prefix)$(incdir-y) ]; then \
diff --git a/arch/xtensa/Makefile b/arch/xtensa/Makefile
index 98fac8489aed..3a3a4c66ef87 100644
--- a/arch/xtensa/Makefile
+++ b/arch/xtensa/Makefile
@@ -71,7 +71,7 @@ archprepare: $(archinc)/.platform
 # Update machine cpu and platform symlinks if something which affects
 # them changed.
 
-$(archinc)/.platform: $(wildcard include/config/arch/*.h) include/config/MARKER
+$(archinc)/.platform: $(wildcard include/config/arch/*.h) include/config/auto.conf
         @echo '  SYMLINK $(archinc)/xtensa/config -> $(archinc)/xtensa/config-$(CPU)'
         $(Q)mkdir -p $(archinc)
         $(Q)mkdir -p $(archinc)/xtensa
diff --git a/scripts/basic/Makefile b/scripts/basic/Makefile
index f22e94c3a2d1..2f60070f9733 100644
--- a/scripts/basic/Makefile
+++ b/scripts/basic/Makefile
@@ -1,17 +1,15 @@
 ###
 # Makefile.basic list the most basic programs used during the build process.
 # The programs listed herein is what is needed to do the basic stuff,
-# such as splitting .config and fix dependency file.
+# such as fix dependency file.
 # This initial step is needed to avoid files to be recompiled
 # when kernel configuration changes (which is what happens when
 # .config is included by main Makefile.
 # ---------------------------------------------------------------------------
 # fixdep:        Used to generate dependency information during build process
-# split-include: Divide all config symbols up in a number of files in
-#                include/config/...
 # docproc:       Used in Documentation/docbook
 
-hostprogs-y     := fixdep split-include docproc
+hostprogs-y     := fixdep docproc
 always          := $(hostprogs-y)
 
 # fixdep is needed to compile other host programs
diff --git a/scripts/basic/split-include.c b/scripts/basic/split-include.c
deleted file mode 100644
index 459c45276cb1..000000000000
--- a/scripts/basic/split-include.c
+++ /dev/null
@@ -1,226 +0,0 @@
-/*
- * split-include.c
- *
- * Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
- * This is a C version of syncdep.pl by Werner Almesberger.
- *
- * This program takes autoconf.h as input and outputs a directory full
- * of one-line include files, merging onto the old values.
- *
- * Think of the configuration options as key-value pairs.  Then there
- * are five cases:
- *
- *    key      old value   new value   action
- *
- *    KEY-1    VALUE-1     VALUE-1     leave file alone
- *    KEY-2    VALUE-2A    VALUE-2B    write VALUE-2B into file
- *    KEY-3    -           VALUE-3     write VALUE-3  into file
- *    KEY-4    VALUE-4     -           write an empty file
- *    KEY-5    (empty)     -           leave old empty file alone
- */
-
-#include <sys/stat.h>
-#include <sys/types.h>
-
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#define ERROR_EXIT(strExit)                                             \
-    {                                                                   \
-        const int errnoSave = errno;                                    \
-        fprintf(stderr, "%s: ", str_my_name);                           \
-        errno = errnoSave;                                              \
-        perror((strExit));                                              \
-        exit(1);                                                        \
-    }
-
-
-
-int main(int argc, const char * argv [])
-{
-    const char * str_my_name;
-    const char * str_file_autoconf;
-    const char * str_dir_config;
-
-    FILE * fp_config;
-    FILE * fp_target;
-    FILE * fp_find;
-
-    int buffer_size;
-
-    char * line;
-    char * old_line;
-    char * list_target;
-    char * ptarget;
-
-    struct stat stat_buf;
-
-    /* Check arg count. */
-    if (argc != 3)
-    {
-        fprintf(stderr, "%s: wrong number of arguments.\n", argv[0]);
-        exit(1);
-    }
-
-    str_my_name       = argv[0];
-    str_file_autoconf = argv[1];
-    str_dir_config    = argv[2];
-
-    /* Find a buffer size. */
-    if (stat(str_file_autoconf, &stat_buf) != 0)
-        ERROR_EXIT(str_file_autoconf);
-    buffer_size = 2 * stat_buf.st_size + 4096;
-
-    /* Allocate buffers. */
-    if ( (line        = malloc(buffer_size)) == NULL
-    ||   (old_line    = malloc(buffer_size)) == NULL
-    ||   (list_target = malloc(buffer_size)) == NULL )
-        ERROR_EXIT(str_file_autoconf);
-
-    /* Open autoconfig file. */
-    if ((fp_config = fopen(str_file_autoconf, "r")) == NULL)
-        ERROR_EXIT(str_file_autoconf);
-
-    /* Make output directory if needed. */
-    if (stat(str_dir_config, &stat_buf) != 0)
-    {
-        if (mkdir(str_dir_config, 0755) != 0)
-            ERROR_EXIT(str_dir_config);
-    }
-
-    /* Change to output directory. */
-    if (chdir(str_dir_config) != 0)
-        ERROR_EXIT(str_dir_config);
-
-    /* Put initial separator into target list. */
-    ptarget = list_target;
-    *ptarget++ = '\n';
-
-    /* Read config lines. */
-    while (fgets(line, buffer_size, fp_config))
-    {
-        const char * str_config;
-        int is_same;
-        int itarget;
-
-        if (line[0] != '#')
-            continue;
-        if ((str_config = strstr(line, "CONFIG_")) == NULL)
-            continue;
-
-        /* Make the output file name. */
-        str_config += sizeof("CONFIG_") - 1;
-        for (itarget = 0; !isspace(str_config[itarget]); itarget++)
-        {
-            int c = (unsigned char) str_config[itarget];
-            if (isupper(c)) c = tolower(c);
-            if (c == '_')   c = '/';
-            ptarget[itarget] = c;
-        }
-        ptarget[itarget++] = '.';
-        ptarget[itarget++] = 'h';
-        ptarget[itarget++] = '\0';
-
-        /* Check for existing file. */
-        is_same = 0;
-        if ((fp_target = fopen(ptarget, "r")) != NULL)
-        {
-            fgets(old_line, buffer_size, fp_target);
-            if (fclose(fp_target) != 0)
-                ERROR_EXIT(ptarget);
-            if (!strcmp(line, old_line))
-                is_same = 1;
-        }
-
-        if (!is_same)
-        {
-            /* Auto-create directories. */
-            int islash;
-            for (islash = 0; islash < itarget; islash++)
-            {
-                if (ptarget[islash] == '/')
-                {
-                    ptarget[islash] = '\0';
-                    if (stat(ptarget, &stat_buf) != 0
-                    &&  mkdir(ptarget, 0755)     != 0)
-                        ERROR_EXIT( ptarget );
-                    ptarget[islash] = '/';
-                }
-            }
-
-            /* Write the file. */
-            if ((fp_target = fopen(ptarget, "w" )) == NULL)
-                ERROR_EXIT(ptarget);
-            fputs(line, fp_target);
-            if (ferror(fp_target) || fclose(fp_target) != 0)
-                ERROR_EXIT(ptarget);
-        }
-
-        /* Update target list */
-        ptarget += itarget;
-        *(ptarget-1) = '\n';
-    }
-
-    /*
-     * Close autoconfig file.
-     * Terminate the target list.
-     */
-    if (fclose(fp_config) != 0)
-        ERROR_EXIT(str_file_autoconf);
-    *ptarget = '\0';
-
-    /*
-     * Fix up existing files which have no new value.
-     * This is Case 4 and Case 5.
-     *
-     * I re-read the tree and filter it against list_target.
-     * This is crude.  But it avoids data copies.  Also, list_target
-     * is compact and contiguous, so it easily fits into cache.
-     *
-     * Notice that list_target contains strings separated by \n,
-     * with a \n before the first string and after the last.
-     * fgets gives the incoming names a terminating \n.
-     * So by having an initial \n, strstr will find exact matches.
-     */
-
-    fp_find = popen("find * -type f -name \"*.h\" -print", "r");
-    if (fp_find == 0)
-        ERROR_EXIT( "find" );
-
-    line[0] = '\n';
-    while (fgets(line+1, buffer_size, fp_find))
-    {
-        if (strstr(list_target, line) == NULL)
-        {
-            /*
-             * This is an old file with no CONFIG_* flag in autoconf.h.
-             */
-
-            /* First strip the \n. */
-            line[strlen(line)-1] = '\0';
-
-            /* Grab size. */
-            if (stat(line+1, &stat_buf) != 0)
-                ERROR_EXIT(line);
-
-            /* If file is not empty, make it empty and give it a fresh date. */
-            if (stat_buf.st_size != 0)
-            {
-                if ((fp_target = fopen(line+1, "w")) == NULL)
-                    ERROR_EXIT(line);
-                if (fclose(fp_target) != 0)
-                    ERROR_EXIT(line);
-            }
-        }
-    }
-
-    if (pclose(fp_find) != 0)
-        ERROR_EXIT("find");
-
-    return 0;
-}
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index ca693fcd023f..e28cd0c2ca08 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -5,6 +5,7 @@
 
 #include <sys/stat.h>
 #include <ctype.h>
+#include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -520,6 +521,119 @@ int conf_write(const char *name)
         return 0;
 }
 
+int conf_split_config(void)
+{
+        char *name, path[128];
+        char *s, *d, c;
+        struct symbol *sym;
+        struct stat sb;
+        int res, i, fd;
+
+        name = getenv("KCONFIG_AUTOCONFIG");
+        if (!name)
+                name = "include/config/auto.conf";
+        conf_read_simple(name, S_DEF_AUTO);
+
+        if (chdir("include/config"))
+                return 1;
+
+        res = 0;
+        for_all_symbols(i, sym) {
+                sym_calc_value(sym);
+                if ((sym->flags & SYMBOL_AUTO) || !sym->name)
+                        continue;
+                if (sym->flags & SYMBOL_WRITE) {
+                        if (sym->flags & SYMBOL_DEF_AUTO) {
+                                /*
+                                 * symbol has old and new value,
+                                 * so compare them...
+                                 */
+                                switch (sym->type) {
+                                case S_BOOLEAN:
+                                case S_TRISTATE:
+                                        if (sym_get_tristate_value(sym) ==
+                                            sym->def[S_DEF_AUTO].tri)
+                                                continue;
+                                        break;
+                                case S_STRING:
+                                case S_HEX:
+                                case S_INT:
+                                        if (!strcmp(sym_get_string_value(sym),
+                                                    sym->def[S_DEF_AUTO].val))
+                                                continue;
+                                        break;
+                                default:
+                                        break;
+                                }
+                        } else {
+                                /*
+                                 * If there is no old value, only 'no' (unset)
+                                 * is allowed as new value.
+                                 */
+                                switch (sym->type) {
+                                case S_BOOLEAN:
+                                case S_TRISTATE:
+                                        if (sym_get_tristate_value(sym) == no)
+                                                continue;
+                                        break;
+                                default:
+                                        break;
+                                }
+                        }
+                } else if (!(sym->flags & SYMBOL_DEF_AUTO))
+                        /* There is neither an old nor a new value. */
+                        continue;
+                /* else
+                 *      There is an old value, but no new value ('no' (unset)
+                 *      isn't saved in auto.conf, so the old value is always
+                 *      different from 'no').
+                 */
+
+                /* Replace all '_' and append ".h" */
+                s = sym->name;
+                d = path;
+                while ((c = *s++)) {
+                        c = tolower(c);
+                        *d++ = (c == '_') ? '/' : c;
+                }
+                strcpy(d, ".h");
+
+                /* Assume directory path already exists. */
+                fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+                if (fd == -1) {
+                        if (errno != ENOENT) {
+                                res = 1;
+                                break;
+                        }
+                        /*
+                         * Create directory components,
+                         * unless they exist already.
+                         */
+                        d = path;
+                        while ((d = strchr(d, '/'))) {
+                                *d = 0;
+                                if (stat(path, &sb) && mkdir(path, 0755)) {
+                                        res = 1;
+                                        goto out;
+                                }
+                                *d++ = '/';
+                        }
+                        /* Try it again. */
+                        fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644);
+                        if (fd == -1) {
+                                res = 1;
+                                break;
+                        }
+                }
+                close(fd);
+        }
+out:
+        if (chdir("../.."))
+                return 1;
+
+        return res;
+}
+
 int conf_write_autoconf(void)
 {
         struct symbol *sym;
@@ -529,8 +643,13 @@ int conf_write_autoconf(void)
         time_t now;
         int i, l;
 
+        sym_clear_all_valid();
+
         file_write_dep("include/config/auto.conf.cmd");
 
+        if (conf_split_config())
+                return 1;
+
         out = fopen(".tmpconfig", "w");
         if (!out)
                 return 1;
@@ -558,8 +677,6 @@ int conf_write_autoconf(void)
                        "#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)
diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h
index 998cf4f656b8..ffd42c7007ee 100644
--- a/scripts/kconfig/expr.h
+++ b/scripts/kconfig/expr.h
@@ -65,6 +65,7 @@ enum symbol_type {
 
 enum {
         S_DEF_USER,             /* main user value */
+        S_DEF_AUTO,
 };
 
 struct symbol {
@@ -97,7 +98,7 @@ struct symbol {
 #define SYMBOL_WARNED           0x8000
 #define SYMBOL_DEF              0x10000
 #define SYMBOL_DEF_USER         0x10000
-#define SYMBOL_DEF2             0x20000
+#define SYMBOL_DEF_AUTO         0x20000
 #define SYMBOL_DEF3             0x40000
 #define SYMBOL_DEF4             0x80000