Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6:
  kbuild: Make DEBUG_SECTION_MISMATCH selectable, but not on by default
  genksyms: Regenerate lexer and parser
  genksyms: Track changes to enum constants
  genksyms: simplify usage of find_symbol()
  genksyms: Add helpers for building string lists
  genksyms: Simplify printing of symbol types
  genksyms: Simplify lexer
  genksyms: Do not paste the bison header file to lex.c
  modpost: fix trailing comma
  KBuild: silence "'scripts/unifdef' is up to date."
  kbuild: Add extra gcc checks
  kbuild: reenable section mismatch analysis
  unifdef: update to upstream version 2.5

12 files changed, 1226 insertions, 935 deletions

diff --git a/scripts/Makefile b/scripts/Makefile
index 2e088109fbd..fcea26168bc 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -18,6 +18,11 @@ always		:= $(hostprogs-y) $(hostprogs-m)
 # The following hostprogs-y programs are only build on demand
 hostprogs-y += unifdef
 
+# This target is used internally to avoid "is up to date" messages
+PHONY += build_unifdef
+build_unifdef: scripts/unifdef FORCE
+        @:
+
 subdir-$(CONFIG_MODVERSIONS) += genksyms
 subdir-y                     += mod
 subdir-$(CONFIG_SECURITY_SELINUX) += selinux
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 4eb99ab3405..d5f925abe4d 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -49,6 +49,40 @@ ifeq ($(KBUILD_NOPEDANTIC),)
                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
         endif
 endif
+
+#
+# make W=1 settings
+#
+# $(call cc-option... ) handles gcc -W.. options which
+# are not supported by all versions of the compiler
+ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
+KBUILD_EXTRA_WARNINGS := -Wextra
+KBUILD_EXTRA_WARNINGS += -Wunused -Wno-unused-parameter
+KBUILD_EXTRA_WARNINGS += -Waggregate-return
+KBUILD_EXTRA_WARNINGS += -Wbad-function-cast
+KBUILD_EXTRA_WARNINGS += -Wcast-qual
+KBUILD_EXTRA_WARNINGS += -Wcast-align
+KBUILD_EXTRA_WARNINGS += -Wconversion
+KBUILD_EXTRA_WARNINGS += -Wdisabled-optimization
+KBUILD_EXTRA_WARNINGS += -Wlogical-op
+KBUILD_EXTRA_WARNINGS += -Wmissing-declarations
+KBUILD_EXTRA_WARNINGS += -Wmissing-format-attribute
+KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wmissing-include-dirs,)
+KBUILD_EXTRA_WARNINGS += -Wmissing-prototypes
+KBUILD_EXTRA_WARNINGS += -Wnested-externs
+KBUILD_EXTRA_WARNINGS += -Wold-style-definition
+KBUILD_EXTRA_WARNINGS += $(call cc-option, -Woverlength-strings,)
+KBUILD_EXTRA_WARNINGS += -Wpacked
+KBUILD_EXTRA_WARNINGS += -Wpacked-bitfield-compat
+KBUILD_EXTRA_WARNINGS += -Wpadded
+KBUILD_EXTRA_WARNINGS += -Wpointer-arith
+KBUILD_EXTRA_WARNINGS += -Wredundant-decls
+KBUILD_EXTRA_WARNINGS += -Wshadow
+KBUILD_EXTRA_WARNINGS += -Wswitch-default
+KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wvla,)
+KBUILD_CFLAGS += $(KBUILD_EXTRA_WARNINGS)
+endif
+
 include scripts/Makefile.lib
 
 ifdef host-progs
@@ -403,7 +437,6 @@ ifneq ($(cmd_files),)
   include $(cmd_files)
 endif
 
-
 # Declare the contents of the .PHONY variable as phony.  We keep that
 # information in a variable se we can use it in if_changed and friends.
 
diff --git a/scripts/genksyms/Makefile b/scripts/genksyms/Makefile
index e420fe44001..13d03cf05d9 100644
--- a/scripts/genksyms/Makefile
+++ b/scripts/genksyms/Makefile
@@ -28,9 +28,9 @@ $(obj)/keywords.c: $(obj)/keywords.gperf FORCE
 # flex
 
 quiet_cmd_lex.c = FLEX    $@
-      cmd_lex.c = flex -o$@ -d $< $(obj)/parse.h
+      cmd_lex.c = flex -o$@ -d $<
 
-$(obj)/lex.c: $(obj)/lex.l $(obj)/parse.h $(obj)/keywords.c FORCE
+$(obj)/lex.c: $(obj)/lex.l $(obj)/keywords.c FORCE
         $(call if_changed,lex.c)
         cp $@ $@_shipped
 
diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c
index f99115ebe92..f9e75531ea0 100644
--- a/scripts/genksyms/genksyms.c
+++ b/scripts/genksyms/genksyms.c
@@ -53,12 +53,22 @@ static int nsyms;
 static struct symbol *expansion_trail;
 static struct symbol *visited_symbols;
 
-static const char *const symbol_type_name[] = {
-        "normal", "typedef", "enum", "struct", "union"
+static const struct {
+        int n;
+        const char *name;
+} symbol_types[] = {
+        [SYM_NORMAL]     = { 0, NULL},
+        [SYM_TYPEDEF]    = {'t', "typedef"},
+        [SYM_ENUM]       = {'e', "enum"},
+        [SYM_STRUCT]     = {'s', "struct"},
+        [SYM_UNION]      = {'u', "union"},
+        [SYM_ENUM_CONST] = {'E', "enum constant"},
 };
 
 static int equal_list(struct string_list *a, struct string_list *b);
 static void print_list(FILE * f, struct string_list *list);
+static struct string_list *concat_list(struct string_list *start, ...);
+static struct string_list *mk_node(const char *string);
 static void print_location(void);
 static void print_type_name(enum symbol_type type, const char *name);
 
@@ -140,14 +150,20 @@ static unsigned long crc32(const char *s)
 
 static enum symbol_type map_to_ns(enum symbol_type t)
 {
-        if (t == SYM_TYPEDEF)
-                t = SYM_NORMAL;
-        else if (t == SYM_UNION)
-                t = SYM_STRUCT;
+        switch (t) {
+        case SYM_ENUM_CONST:
+        case SYM_NORMAL:
+        case SYM_TYPEDEF:
+                return SYM_NORMAL;
+        case SYM_ENUM:
+        case SYM_STRUCT:
+        case SYM_UNION:
+                return SYM_STRUCT;
+        }
         return t;
 }
 
-struct symbol *find_symbol(const char *name, enum symbol_type ns)
+struct symbol *find_symbol(const char *name, enum symbol_type ns, int exact)
 {
         unsigned long h = crc32(name) % HASH_BUCKETS;
         struct symbol *sym;
@@ -158,6 +174,8 @@ struct symbol *find_symbol(const char *name, enum symbol_type ns)
                     sym->is_declared)
                         break;
 
+        if (exact && sym && sym->type != ns)
+                return NULL;
         return sym;
 }
 
@@ -180,10 +198,47 @@ static struct symbol *__add_symbol(const char *name, enum symbol_type type,
                             struct string_list *defn, int is_extern,
                             int is_reference)
 {
-        unsigned long h = crc32(name) % HASH_BUCKETS;
+        unsigned long h;
         struct symbol *sym;
         enum symbol_status status = STATUS_UNCHANGED;
+        /* The parser adds symbols in the order their declaration completes,
+         * so it is safe to store the value of the previous enum constant in
+         * a static variable.
+         */
+        static int enum_counter;
+        static struct string_list *last_enum_expr;
+
+        if (type == SYM_ENUM_CONST) {
+                if (defn) {
+                        free_list(last_enum_expr, NULL);
+                        last_enum_expr = copy_list_range(defn, NULL);
+                        enum_counter = 1;
+                } else {
+                        struct string_list *expr;
+                        char buf[20];
+
+                        snprintf(buf, sizeof(buf), "%d", enum_counter++);
+                        if (last_enum_expr) {
+                                expr = copy_list_range(last_enum_expr, NULL);
+                                defn = concat_list(mk_node("("),
+                                                   expr,
+                                                   mk_node(")"),
+                                                   mk_node("+"),