kconfig: integrate split config into silentoldconfig

Now that kconfig can load multiple configurations, it becomes simple to
integrate the split config step, by simply comparing the new .config file with
the old auto.conf (and then saving the new auto.conf).  A nice side effect is
that this saves a bit of disk space and cache, as no data needs to be read
from or saved into the splitted config files anymore (e.g.  include/config is
now 648KB instead of 5.2MB).

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

8 files changed, 129 insertions, 246 deletions

diff --git a/Makefile b/Makefile
index b1610562a65..4b996c8fb70 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 6f8e84c1c1f..9791d870ae7 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 c72e17a96ee..e467a450662 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 98fac8489ae..3a3a4c66ef8 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 f22e94c3a2d..2f60070f973 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 459c45276cb..00000000000
--- 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