X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=scripts%2Fmod%2Fmodpost.c;h=3a12c22cc2f8f0ca82f624a50c4878fce389e7bb;hb=6d9a89ea4b06146d29e1ffb4d6fded286fa07d29;hp=30f3ac8eb43c0c16a7d86a358d04ac62e31dc989;hpb=f7b05e64bdb2fcc4b2dc94a4bd9426adc70c9599;p=safe%2Fjmp%2Flinux-2.6

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 30f3ac8..3a12c22 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -13,6 +13,7 @@
 
 #include <ctype.h>
 #include "modpost.h"
+#include "../../include/linux/license.h"
 
 /* Are we using CONFIG_MODVERSIONS? */
 int modversions = 0;
@@ -22,8 +23,19 @@ int have_vmlinux = 0;
 static int all_versions = 0;
 /* If we are modposting external module set to 1 */
 static int external_module = 0;
+/* Warn about section mismatch in vmlinux if set to 1 */
+static int vmlinux_section_warnings = 1;
+/* Only warn about unresolved symbols */
+static int warn_unresolved = 0;
+/* How a symbol is exported */
+enum export {
+	export_plain,      export_unused,     export_gpl,
+	export_unused_gpl, export_gpl_future, export_unknown
+};
+
+#define PRINTF __attribute__ ((format (printf, 1, 2)))
 
-void fatal(const char *fmt, ...)
+PRINTF void fatal(const char *fmt, ...)
 {
 	va_list arglist;
 
@@ -36,7 +48,7 @@ void fatal(const char *fmt, ...)
 	exit(1);
 }
 
-void warn(const char *fmt, ...)
+PRINTF void warn(const char *fmt, ...)
 {
 	va_list arglist;
 
@@ -47,6 +59,17 @@ void warn(const char *fmt, ...)
 	va_end(arglist);
 }
 
+PRINTF void merror(const char *fmt, ...)
+{
+	va_list arglist;
+
+	fprintf(stderr, "ERROR: ");
+
+	va_start(arglist, fmt);
+	vfprintf(stderr, fmt, arglist);
+	va_end(arglist);
+}
+
 static int is_vmlinux(const char *modname)
 {
 	const char *myname;
@@ -56,7 +79,8 @@ static int is_vmlinux(const char *modname)
 	else
 		myname = modname;
 
-	return strcmp(myname, "vmlinux") == 0;
+	return (strcmp(myname, "vmlinux") == 0) ||
+	       (strcmp(myname, "vmlinux.o") == 0);
 }
 
 void *do_nofail(void *ptr, const char *expr)
@@ -97,6 +121,7 @@ static struct module *new_module(char *modname)
 
 	/* add to list */
 	mod->name = p;
+	mod->gpl_compatible = -1;
 	mod->next = modules;
 	modules = mod;
 
@@ -118,6 +143,7 @@ struct symbol {
 	unsigned int kernel:1;     /* 1 if symbol is from kernel
 				    *  (only for external modules) **/
 	unsigned int preloaded:1;  /* 1 if symbol from Module.symvers */
+	enum export  export;       /* Type of export */
 	char name[0];
 };
 
@@ -153,7 +179,8 @@ static struct symbol *alloc_symbol(const char *name, unsigned int weak,
 }
 
 /* For the hash of exported symbols */
-static struct symbol *new_symbol(const char *name, struct module *module)
+static struct symbol *new_symbol(const char *name, struct module *module,
+				 enum export export)
 {
 	unsigned int hash;
 	struct symbol *new;
@@ -161,6 +188,7 @@ static struct symbol *new_symbol(const char *name, struct module *module)
 	hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
 	new = symbolhash[hash] = alloc_symbol(name, 0, symbolhash[hash]);
 	new->module = module;
+	new->export = export;
 	return new;
 }
 
@@ -179,37 +207,88 @@ static struct symbol *find_symbol(const char *name)
 	return NULL;
 }
 
+static struct {
+	const char *str;
+	enum export export;
+} export_list[] = {
+	{ .str = "EXPORT_SYMBOL",            .export = export_plain },
+	{ .str = "EXPORT_UNUSED_SYMBOL",     .export = export_unused },
+	{ .str = "EXPORT_SYMBOL_GPL",        .export = export_gpl },
+	{ .str = "EXPORT_UNUSED_SYMBOL_GPL", .export = export_unused_gpl },
+	{ .str = "EXPORT_SYMBOL_GPL_FUTURE", .export = export_gpl_future },
+	{ .str = "(unknown)",                .export = export_unknown },
+};
+
+
+static const char *export_str(enum export ex)
+{
+	return export_list[ex].str;
+}
+
+static enum export export_no(const char * s)
+{
+	int i;
+	if (!s)
+		return export_unknown;
+	for (i = 0; export_list[i].export != export_unknown; i++) {
+		if (strcmp(export_list[i].str, s) == 0)
+			return export_list[i].export;
+	}
+	return export_unknown;
+}
+
+static enum export export_from_sec(struct elf_info *elf, Elf_Section sec)
+{
+	if (sec == elf->export_sec)
+		return export_plain;
+	else if (sec == elf->export_unused_sec)
+		return export_unused;
+	else if (sec == elf->export_gpl_sec)
+		return export_gpl;
+	else if (sec == elf->export_unused_gpl_sec)
+		return export_unused_gpl;
+	else if (sec == elf->export_gpl_future_sec)
+		return export_gpl_future;
+	else
+		return export_unknown;
+}
+
 /**
  * Add an exported symbol - it may have already been added without a
  * CRC, in this case just update the CRC
  **/
-static struct symbol *sym_add_exported(const char *name, struct module *mod)
+static struct symbol *sym_add_exported(const char *name, struct module *mod,
+				       enum export export)
 {
 	struct symbol *s = find_symbol(name);
 
 	if (!s) {
-		s = new_symbol(name, mod);
+		s = new_symbol(name, mod, export);
 	} else {
 		if (!s->preloaded) {
 			warn("%s: '%s' exported twice. Previous export "
 			     "was in %s%s\n", mod->name, name,
 			     s->module->name,
 			     is_vmlinux(s->module->name) ?"":".ko");
+		} else {
+			/* In case Modules.symvers was out of date */
+			s->module = mod;
 		}
 	}
 	s->preloaded = 0;
 	s->vmlinux   = is_vmlinux(mod->name);
 	s->kernel    = 0;
+	s->export    = export;
 	return s;
 }
 
 static void sym_update_crc(const char *name, struct module *mod,
-			   unsigned int crc)
+			   unsigned int crc, enum export export)
 {
 	struct symbol *s = find_symbol(name);
 
 	if (!s)
-		s = new_symbol(name, mod);
+		s = new_symbol(name, mod, export);
 	s->crc = crc;
 	s->crc_valid = 1;
 }
@@ -273,30 +352,46 @@ void release_file(void *file, unsigned long size)
 	munmap(file, size);
 }
 
-static void parse_elf(struct elf_info *info, const char *filename)
+static int parse_elf(struct elf_info *info, const char *filename)
 {
 	unsigned int i;
-	Elf_Ehdr *hdr = info->hdr;
+	Elf_Ehdr *hdr;
 	Elf_Shdr *sechdrs;
 	Elf_Sym  *sym;
 
 	hdr = grab_file(filename, &info->size);
 	if (!hdr) {
 		perror(filename);
-		abort();
+		exit(1);
 	}
 	info->hdr = hdr;
-	if (info->size < sizeof(*hdr))
-		goto truncated;
-
+	if (info->size < sizeof(*hdr)) {
+		/* file too small, assume this is an empty .o file */
+		return 0;
+	}
+	/* Is this a valid ELF file? */
+	if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
+	    (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
+	    (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
+	    (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
+		/* Not an ELF file - silently ignore it */
+		return 0;
+	}
 	/* Fix endianness in ELF header */
 	hdr->e_shoff    = TO_NATIVE(hdr->e_shoff);
 	hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
 	hdr->e_shnum    = TO_NATIVE(hdr->e_shnum);
 	hdr->e_machine  = TO_NATIVE(hdr->e_machine);
+	hdr->e_type     = TO_NATIVE(hdr->e_type);
 	sechdrs = (void *)hdr + hdr->e_shoff;
 	info->sechdrs = sechdrs;
 
+	/* Check if file offset is correct */
+	if (hdr->e_shoff > info->size) {
+		fatal("section header offset=%u in file '%s' is bigger then filesize=%lu\n", hdr->e_shoff, filename, info->size);
+		return 0;
+	}
+
 	/* Fix endianness in section headers */
 	for (i = 0; i < hdr->e_shnum; i++) {
 		sechdrs[i].sh_type   = TO_NATIVE(sechdrs[i].sh_type);
@@ -304,18 +399,34 @@ static void parse_elf(struct elf_info *info, const char *filename)
 		sechdrs[i].sh_size   = TO_NATIVE(sechdrs[i].sh_size);
 		sechdrs[i].sh_link   = TO_NATIVE(sechdrs[i].sh_link);
 		sechdrs[i].sh_name   = TO_NATIVE(sechdrs[i].sh_name);
+		sechdrs[i].sh_info   = TO_NATIVE(sechdrs[i].sh_info);
+		sechdrs[i].sh_addr   = TO_NATIVE(sechdrs[i].sh_addr);
 	}
 	/* Find symbol table. */
 	for (i = 1; i < hdr->e_shnum; i++) {
 		const char *secstrings
 			= (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+		const char *secname;
 
-		if (sechdrs[i].sh_offset > info->size)
-			goto truncated;
-		if (strcmp(secstrings+sechdrs[i].sh_name, ".modinfo") == 0) {
+		if (sechdrs[i].sh_offset > info->size) {
+			fatal("%s is truncated. sechdrs[i].sh_offset=%u > sizeof(*hrd)=%ul\n", filename, (unsigned int)sechdrs[i].sh_offset, sizeof(*hdr));
+			return 0;
+		}
+		secname = secstrings + sechdrs[i].sh_name;
+		if (strcmp(secname, ".modinfo") == 0) {
 			info->modinfo = (void *)hdr + sechdrs[i].sh_offset;
 			info->modinfo_len = sechdrs[i].sh_size;
-		}
+		} else if (strcmp(secname, "__ksymtab") == 0)
+			info->export_sec = i;
+		else if (strcmp(secname, "__ksymtab_unused") == 0)
+			info->export_unused_sec = i;
+		else if (strcmp(secname, "__ksymtab_gpl") == 0)
+			info->export_gpl_sec = i;
+		else if (strcmp(secname, "__ksymtab_unused_gpl") == 0)
+			info->export_unused_gpl_sec = i;
+		else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
+			info->export_gpl_future_sec = i;
+
 		if (sechdrs[i].sh_type != SHT_SYMTAB)
 			continue;
 
@@ -335,10 +446,7 @@ static void parse_elf(struct elf_info *info, const char *filename)
 		sym->st_value = TO_NATIVE(sym->st_value);
 		sym->st_size  = TO_NATIVE(sym->st_size);
 	}
-	return;
-
- truncated:
-	fatal("%s is truncated.\n", filename);
+	return 1;
 }
 
 static void parse_elf_finish(struct elf_info *info)
@@ -353,6 +461,7 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
 			       Elf_Sym *sym, const char *symname)
 {
 	unsigned int crc;
+	enum export export = export_from_sec(info, sym->st_shndx);
 
 	switch (sym->st_shndx) {
 	case SHN_COMMON:
@@ -362,7 +471,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
 		/* CRC'd symbol */
 		if (memcmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
 			crc = (unsigned int) sym->st_value;
-			sym_update_crc(symname + strlen(CRC_PFX), mod, crc);
+			sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
+					export);
 		}
 		break;
 	case SHN_UNDEF:
@@ -406,7 +516,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
 	default:
 		/* All exported symbols */
 		if (memcmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
-			sym_add_exported(symname + strlen(KSYMTAB_PFX), mod);
+			sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
+					export);
 		}
 		if (strcmp(symname, MODULE_SYMBOL_PREFIX "init_module") == 0)
 			mod->has_init = 1;
@@ -437,13 +548,18 @@ static char *next_string(char *string, unsigned long *secsize)
 	return string;
 }
 
-static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
-			 const char *tag)
+static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
+			      const char *tag, char *info)
 {
 	char *p;
 	unsigned int taglen = strlen(tag);
 	unsigned long size = modinfo_len;
 
+	if (info) {
+		size -= info - (char *)modinfo;
+		modinfo = next_string(info, &size);
+	}
+
 	for (p = modinfo; p; p = next_string(p, &size)) {
 		if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
 			return p + taglen + 1;
@@ -451,6 +567,13 @@ static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
 	return NULL;
 }
 
+static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
+			 const char *tag)
+
+{
+	return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
+}
+
 /**
  * Test if string s ends in string sub
  * return 0 if match
@@ -474,8 +597,62 @@ static int strrcmp(const char *s, const char *sub)
         return memcmp(s + slen - sublen, sub, sublen);
 }
 
+/*
+ * Functions used only during module init is marked __init and is stored in
+ * a .init.text section. Likewise data is marked __initdata and stored in
+ * a .init.data section.
+ * If this section is one of these sections return 1
+ * See include/linux/init.h for the details
+ */
+static int init_section(const char *name)
+{
+	if (strcmp(name, ".init") == 0)
+		return 1;
+	if (strncmp(name, ".init.", strlen(".init.")) == 0)
+		return 1;
+	return 0;
+}
+
+/*
+ * Functions used only during module exit is marked __exit and is stored in
+ * a .exit.text section. Likewise data is marked __exitdata and stored in
+ * a .exit.data section.
+ * If this section is one of these sections return 1
+ * See include/linux/init.h for the details
+ **/
+static int exit_section(const char *name)
+{
+	if (strcmp(name, ".exit.text") == 0)
+		return 1;
+	if (strcmp(name, ".exit.data") == 0)
+		return 1;
+	return 0;
+
+}
+
+/*
+ * Data sections are named like this:
+ * .data | .data.rel | .data.rel.*
+ * Return 1 if the specified section is a data section
+ */
+static int data_section(const char *name)
+{
+	if ((strcmp(name, ".data") == 0) ||
+	    (strcmp(name, ".data.rel") == 0) ||
+	    (strncmp(name, ".data.rel.", strlen(".data.rel.")) == 0))
+		return 1;
+	else
+		return 0;
+}
+
 /**
  * Whitelist to allow certain references to pass with no warning.
+ *
+ * Pattern 0:
+ *   Do not warn if funtion/data are marked with __init_refok/__initdata_refok.
+ *   The pattern is identified by:
+ *   fromsec = .text.init.refok* | .data.init.refok*
+ *
  * Pattern 1:
  *   If a module parameter is declared __initdata and permissions=0
  *   then this is legal despite the warning generated.
@@ -487,51 +664,99 @@ static int strrcmp(const char *s, const char *sub)
  *   atsym   =__param*
  *
  * Pattern 2:
- *   Many drivers utilise a *_driver container with references to
+ *   Many drivers utilise a *driver container with references to
  *   add, remove, probe functions etc.
  *   These functions may often be marked __init and we do not want to
  *   warn here.
  *   the pattern is identified by:
- *   tosec   = .init.text | .exit.text
- *   fromsec = .data
- *   atsym = *_driver, *_ops, *_probe, *probe_one
+ *   tosec   = init or exit section
+ *   fromsec = data section
+ *   atsym = *driver, *_template, *_sht, *_ops, *_probe, *probe_one, *_console, *_timer
+ *
+ * Pattern 3:
+ *   Whitelist all refereces from .text.head to .init.data
+ *   Whitelist all refereces from .text.head to .init.text
+ *
+ * Pattern 4:
+ *   Some symbols belong to init section but still it is ok to reference
+ *   these from non-init sections as these symbols don't have any memory
+ *   allocated for them and symbol address and value are same. So even
+ *   if init section is freed, its ok to reference those symbols.
+ *   For ex. symbols marking the init section boundaries.
+ *   This pattern is identified by
+ *   refsymname = __init_begin, _sinittext, _einittext
+ *
+ * Pattern 5:
+ *   Xtensa uses literal sections for constants that are accessed PC-relative.
+ *   Literal sections may safely reference their text sections.
+ *   (Note that the name for the literal section omits any trailing '.text')
+ *   tosec = <section>[.text]
+ *   fromsec = <section>.literal
  **/
-static int secref_whitelist(const char *tosec, const char *fromsec,
-			  const char *atsym)
+static int secref_whitelist(const char *modname, const char *tosec,
+			    const char *fromsec, const char *atsym,
+			    const char *refsymname)
 {
-	int f1 = 1, f2 = 1;
+	int len;
 	const char **s;
 	const char *pat2sym[] = {
-		"_driver",
+		"driver",
+		"_template", /* scsi uses *_template a lot */
+		"_timer",    /* arm uses ops structures named _timer a lot */
+		"_sht",      /* scsi also used *_sht to some extent */
 		"_ops",
 		"_probe",
 		"_probe_one",
+		"_console",
 		NULL
 	};
 
-	/* Check for pattern 1 */
-	if (strcmp(tosec, ".init.data") != 0)
-		f1 = 0;
-	if (strncmp(fromsec, ".data", strlen(".data")) != 0)
-		f1 = 0;
-	if (strncmp(atsym, "__param", strlen("__param")) != 0)
-		f1 = 0;
+	const char *pat3refsym[] = {
+		"__init_begin",
+		"_sinittext",
+		"_einittext",
+		NULL
+	};
+
+	/* Check for pattern 0 */
+	if ((strncmp(fromsec, ".text.init.refok", strlen(".text.init.refok")) == 0) ||
+	    (strncmp(fromsec, ".exit.text.refok", strlen(".exit.text.refok")) == 0) ||
+	    (strncmp(fromsec, ".data.init.refok", strlen(".data.init.refok")) == 0))
+		return 1;
 
-	if (f1)
-		return f1;
+	/* Check for pattern 1 */
+	if ((strcmp(tosec, ".init.data") == 0) &&
+	    (strncmp(fromsec, ".data", strlen(".data")) == 0) &&
+	    (strncmp(atsym, "__param", strlen("__param")) == 0))
+		return 1;
 
 	/* Check for pattern 2 */
-	if ((strcmp(tosec, ".init.text") != 0) &&
-	    (strcmp(tosec, ".exit.text") != 0))
-		f2 = 0;
-	if (strcmp(fromsec, ".data") != 0)
-		f2 = 0;
+	if ((init_section(tosec) || exit_section(tosec)) && data_section(fromsec))
+		for (s = pat2sym; *s; s++)
+			if (strrcmp(atsym, *s) == 0)
+				return 1;
+
+	/* Check for pattern 3 */
+	if ((strcmp(fromsec, ".text.head") == 0) &&
+		((strcmp(tosec, ".init.data") == 0) ||
+		(strcmp(tosec, ".init.text") == 0)))
+	return 1;
 
-	for (s = pat2sym; *s; s++)
-		if (strrcmp(atsym, *s) == 0)
-			f1 = 1;
+	/* Check for pattern 4 */
+	for (s = pat3refsym; *s; s++)
+		if (strcmp(refsymname, *s) == 0)
+			return 1;
 
-	return f1 && f2;
+	/* Check for pattern 5 */
+	if (strrcmp(tosec, ".text") == 0)
+		len = strlen(tosec) - strlen(".text");
+	else
+		len = strlen(tosec);
+	if ((strncmp(tosec, fromsec, len) == 0) && (strlen(fromsec) > len) &&
+	    (strcmp(fromsec + len, ".literal") == 0))
+		return 1;
+
+	return 0;
 }
 
 /**
@@ -551,12 +776,38 @@ static Elf_Sym *find_elf_symbol(struct elf_info *elf, Elf_Addr addr,
 	for (sym = elf->symtab_start; sym < elf->symtab_stop; sym++) {
 		if (sym->st_shndx != relsym->st_shndx)
 			continue;
+		if (ELF_ST_TYPE(sym->st_info) == STT_SECTION)
+			continue;
 		if (sym->st_value == addr)
 			return sym;
 	}
 	return NULL;
 }
 
+static inline int is_arm_mapping_symbol(const char *str)
+{
+	return str[0] == '$' && strchr("atd", str[1])
+	       && (str[2] == '\0' || str[2] == '.');
+}
+
+/*
+ * If there's no name there, ignore it; likewise, ignore it if it's
+ * one of the magic symbols emitted used by current ARM tools.
+ *
+ * Otherwise if find_symbols_between() returns those symbols, they'll
+ * fail the whitelist tests and cause lots of false alarms ... fixable
+ * only by merging __exit and __init sections into __text, bloating
+ * the kernel (which is especially evil on embedded platforms).
+ */
+static inline int is_valid_name(struct elf_info *elf, Elf_Sym *sym)
+{
+	const char *name = elf->strtab + sym->st_name;
+
+	if (!name || !strlen(name))
+		return 0;
+	return !is_arm_mapping_symbol(name);
+}
+
 /*
  * Find symbols before or equal addr and after addr - in the section sec.
  * If we find two symbols with equal offset prefer one with a valid name.
@@ -585,16 +836,15 @@ static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
 		symsec = secstrings + elf->sechdrs[sym->st_shndx].sh_name;
 		if (strcmp(symsec, sec) != 0)
 			continue;
+		if (!is_valid_name(elf, sym))
+			continue;
 		if (sym->st_value <= addr) {
 			if ((addr - sym->st_value) < beforediff) {
 				beforediff = addr - sym->st_value;
 				*before = sym;
 			}
 			else if ((addr - sym->st_value) == beforediff) {
-				/* equal offset, valid name? */
-				const char *name = elf->strtab + sym->st_name;
-				if (name && strlen(name))
-					*before = sym;
+				*before = sym;
 			}
 		}
 		else
@@ -604,10 +854,7 @@ static void find_symbols_between(struct elf_info *elf, Elf_Addr addr,
 				*after = sym;
 			}
 			else if ((sym->st_value - addr) == afterdiff) {
-				/* equal offset, valid name? */
-				const char *name = elf->strtab + sym->st_name;
-				if (name && strlen(name))
-					*after = sym;
+				*after = sym;
 			}
 		}
 	}
@@ -637,35 +884,107 @@ static void warn_sec_mismatch(const char *modname, const char *fromsec,
 		refsymname = elf->strtab + refsym->st_name;
 
 	/* check whitelist - we may ignore it */
-	if (before &&
-	    secref_whitelist(secname, fromsec, elf->strtab + before->st_name))
+	if (secref_whitelist(modname, secname, fromsec,
+			     before ? elf->strtab + before->st_name : "",
+	                     refsymname))
 		return;
 
 	if (before && after) {
-		warn("%s - Section mismatch: reference to %s:%s from %s "
-		     "between '%s' (at offset 0x%llx) and '%s'\n",
-		     modname, secname, refsymname, fromsec,
+		warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
+		     "(between '%s' and '%s')\n",
+		     modname, fromsec, (unsigned long long)r.r_offset,
+		     secname, refsymname,
 		     elf->strtab + before->st_name,
-		     (long long)r.r_offset,
 		     elf->strtab + after->st_name);
 	} else if (before) {
-		warn("%s - Section mismatch: reference to %s:%s from %s "
-		     "after '%s' (at offset 0x%llx)\n",
-		     modname, secname, refsymname, fromsec,
-		     elf->strtab + before->st_name,
-		     (long long)r.r_offset);
+		warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
+		     "(after '%s')\n",
+		     modname, fromsec, (unsigned long long)r.r_offset,
+		     secname, refsymname,
+		     elf->strtab + before->st_name);
 	} else if (after) {
-		warn("%s - Section mismatch: reference to %s:%s from %s "
+		warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s "
 		     "before '%s' (at offset -0x%llx)\n",
-		     modname, secname, refsymname, fromsec,
-		     elf->strtab + before->st_name,
-		     (long long)r.r_offset);
+		     modname, fromsec, (unsigned long long)r.r_offset,
+		     secname, refsymname,
+		     elf->strtab + after->st_name);
 	} else {
-		warn("%s - Section mismatch: reference to %s:%s from %s "
-		     "(offset 0x%llx)\n",
-		     modname, secname, fromsec, refsymname,
-		     (long long)r.r_offset);
+		warn("%s(%s+0x%llx): Section mismatch: reference to %s:%s\n",
+		     modname, fromsec, (unsigned long long)r.r_offset,
+		     secname, refsymname);
+	}
+}
+
+static unsigned int *reloc_location(struct elf_info *elf,
+					   int rsection, Elf_Rela *r)
+{
+	Elf_Shdr *sechdrs = elf->sechdrs;
+	int section = sechdrs[rsection].sh_info;
+
+	return (void *)elf->hdr + sechdrs[section].sh_offset +
+		(r->r_offset - sechdrs[section].sh_addr);
+}
+
+static int addend_386_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+{
+	unsigned int r_typ = ELF_R_TYPE(r->r_info);
+	unsigned int *location = reloc_location(elf, rsection, r);
+
+	switch (r_typ) {
+	case R_386_32:
+		r->r_addend = TO_NATIVE(*location);
+		break;
+	case R_386_PC32:
+		r->r_addend = TO_NATIVE(*location) + 4;
+		/* For CONFIG_RELOCATABLE=y */
+		if (elf->hdr->e_type == ET_EXEC)
+			r->r_addend += r->r_offset;
+		break;
+	}
+	return 0;
+}
+
+static int addend_arm_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+{
+	unsigned int r_typ = ELF_R_TYPE(r->r_info);
+
+	switch (r_typ) {
+	case R_ARM_ABS32:
+		/* From ARM ABI: (S + A) | T */
+		r->r_addend = (int)(long)(elf->symtab_start + ELF_R_SYM(r->r_info));
+		break;
+	case R_ARM_PC24:
+		/* From ARM ABI: ((S + A) | T) - P */
+		r->r_addend = (int)(long)(elf->hdr + elf->sechdrs[rsection].sh_offset +
+		                          (r->r_offset - elf->sechdrs[rsection].sh_addr));
+		break;
+	default:
+		return 1;
 	}
+	return 0;
+}
+
+static int addend_mips_rel(struct elf_info *elf, int rsection, Elf_Rela *r)
+{
+	unsigned int r_typ = ELF_R_TYPE(r->r_info);
+	unsigned int *location = reloc_location(elf, rsection, r);
+	unsigned int inst;
+
+	if (r_typ == R_MIPS_HI16)
+		return 1;	/* skip this */
+	inst = TO_NATIVE(*location);
+	switch (r_typ) {
+	case R_MIPS_LO16:
+		r->r_addend = inst & 0xffff;
+		break;
+	case R_MIPS_26:
+		r->r_addend = (inst & 0x03ffffff) << 2;
+		break;
+	case R_MIPS_32:
+		r->r_addend = inst;
+		break;
+	}
+	return 0;
 }
 
 /**
@@ -694,50 +1013,166 @@ static void check_sec_ref(struct module *mod, const char *modname,
 
 	/* Walk through all sections */
 	for (i = 0; i < hdr->e_shnum; i++) {
-		Elf_Rela *rela;
-		Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
-		Elf_Rela *stop  = (void*)start + sechdrs[i].sh_size;
-		const char *name = secstrings + sechdrs[i].sh_name +
-						strlen(".rela");
+		const char *name = secstrings + sechdrs[i].sh_name;
+		const char *secname;
+		Elf_Rela r;
+		unsigned int r_sym;
 		/* We want to process only relocation sections and not .init */
-		if (section_ref_ok(name) || (sechdrs[i].sh_type != SHT_RELA))
-			continue;
+		if (sechdrs[i].sh_type == SHT_RELA) {
+			Elf_Rela *rela;
+			Elf_Rela *start = (void *)hdr + sechdrs[i].sh_offset;
+			Elf_Rela *stop  = (void*)start + sechdrs[i].sh_size;
+			name += strlen(".rela");
+			if (section_ref_ok(name))
+				continue;
 
-		for (rela = start; rela < stop; rela++) {
-			Elf_Rela r;
-			const char *secname;
-			r.r_offset = TO_NATIVE(rela->r_offset);
-			r.r_info   = TO_NATIVE(rela->r_info);
-			r.r_addend = TO_NATIVE(rela->r_addend);
-			sym = elf->symtab_start + ELF_R_SYM(r.r_info);
-			/* Skip special sections */
-			if (sym->st_shndx >= SHN_LORESERVE)
+			for (rela = start; rela < stop; rela++) {
+				r.r_offset = TO_NATIVE(rela->r_offset);
+#if KERNEL_ELFCLASS == ELFCLASS64
+				if (hdr->e_machine == EM_MIPS) {
+					unsigned int r_typ;
+					r_sym = ELF64_MIPS_R_SYM(rela->r_info);
+					r_sym = TO_NATIVE(r_sym);
+					r_typ = ELF64_MIPS_R_TYPE(rela->r_info);
+					r.r_info = ELF64_R_INFO(r_sym, r_typ);
+				} else {
+					r.r_info = TO_NATIVE(rela->r_info);
+					r_sym = ELF_R_SYM(r.r_info);
+				}
+#else
+				r.r_info = TO_NATIVE(rela->r_info);
+				r_sym = ELF_R_SYM(r.r_info);
+#endif
+				r.r_addend = TO_NATIVE(rela->r_addend);
+				sym = elf->symtab_start + r_sym;
+				/* Skip special sections */
+				if (sym->st_shndx >= SHN_LORESERVE)
+					continue;
+
+				secname = secstrings +
+					sechdrs[sym->st_shndx].sh_name;
+				if (section(secname))
+					warn_sec_mismatch(modname, name,
+							  elf, sym, r);
+			}
+		} else if (sechdrs[i].sh_type == SHT_REL) {
+			Elf_Rel *rel;
+			Elf_Rel *start = (void *)hdr + sechdrs[i].sh_offset;
+			Elf_Rel *stop  = (void*)start + sechdrs[i].sh_size;
+			name += strlen(".rel");
+			if (section_ref_ok(name))
 				continue;
 
-			secname = secstrings + sechdrs[sym->st_shndx].sh_name;
-			if (section(secname))
-				warn_sec_mismatch(modname, name, elf, sym, r);
+			for (rel = start; rel < stop; rel++) {
+				r.r_offset = TO_NATIVE(rel->r_offset);
+#if KERNEL_ELFCLASS == ELFCLASS64
+				if (hdr->e_machine == EM_MIPS) {
+					unsigned int r_typ;
+					r_sym = ELF64_MIPS_R_SYM(rel->r_info);
+					r_sym = TO_NATIVE(r_sym);
+					r_typ = ELF64_MIPS_R_TYPE(rel->r_info);
+					r.r_info = ELF64_R_INFO(r_sym, r_typ);
+				} else {
+					r.r_info = TO_NATIVE(rel->r_info);
+					r_sym = ELF_R_SYM(r.r_info);
+				}
+#else
+				r.r_info = TO_NATIVE(rel->r_info);
+				r_sym = ELF_R_SYM(r.r_info);
+#endif
+				r.r_addend = 0;
+				switch (hdr->e_machine) {
+				case EM_386:
+					if (addend_386_rel(elf, i, &r))
+						continue;
+					break;
+				case EM_ARM:
+					if(addend_arm_rel(elf, i, &r))
+						continue;
+					break;
+				case EM_MIPS:
+					if (addend_mips_rel(elf, i, &r))
+						continue;
+					break;
+				}
+				sym = elf->symtab_start + r_sym;
+				/* Skip special sections */
+				if (sym->st_shndx >= SHN_LORESERVE)
+					continue;
+
+				secname = secstrings +
+					sechdrs[sym->st_shndx].sh_name;
+				if (section(secname))
+					warn_sec_mismatch(modname, name,
+							  elf, sym, r);
+			}
 		}
 	}
 }
 
-/**
- * Functions used only during module init is marked __init and is stored in
- * a .init.text section. Likewise data is marked __initdata and stored in
- * a .init.data section.
- * If this section is one of these sections return 1
- * See include/linux/init.h for the details
- **/
-static int init_section(const char *name)
+/*
+ * Identify sections from which references to either a
+ * .init or a .exit section is OK.
+ *
+ * [OPD] Keith Ownes <kaos@sgi.com> commented:
+ * For our future {in}sanity, add a comment that this is the ppc .opd
+ * section, not the ia64 .opd section.
+ * ia64 .opd should not point to discarded sections.
+ * [.rodata] like for .init.text we ignore .rodata references -same reason
+ */
+static int initexit_section_ref_ok(const char *name)
 {
-	if (strcmp(name, ".init") == 0)
-		return 1;
-	if (strncmp(name, ".init.", strlen(".init.")) == 0)
-		return 1;
+	const char **s;
+	/* Absolute section names */
+	const char *namelist1[] = {
+		"__bug_table",		/* used by powerpc for BUG() */
+		"__ex_table",
+		".altinstructions",
+		".cranges",		/* used by sh64 */
+		".fixup",
+		".machvec",		/* ia64 + powerpc uses these */
+		".machine.desc",
+		".opd",			/* See comment [OPD] */
+		"__dbe_table",
+		".parainstructions",
+		".pdr",
+		".plt",			/* seen on ARCH=um build on x86_64. Harmless */
+		".smp_locks",
+		".stab",
+		".m68k_fixup",
+		".xt.prop",		/* xtensa informational section */
+		".xt.lit",		/* xtensa informational section */
+		NULL
+	};
+	/* Start of section names */
+	const char *namelist2[] = {
+		".debug",
+		".eh_frame",
+		".note",		/* ignore ELF notes - may contain anything */
+		".got",			/* powerpc - global offset table */
+		".toc",			/* powerpc - table of contents */
+		NULL
+	};
+	/* part of section name */
+	const char *namelist3 [] = {
+		".unwind",  /* Sample: IA_64.unwind.exit.text */
+		NULL
+	};
+
+	for (s = namelist1; *s; s++)
+		if (strcmp(*s, name) == 0)
+			return 1;
+	for (s = namelist2; *s; s++)
+		if (strncmp(*s, name, strlen(*s)) == 0)
+			return 1;
+	for (s = namelist3; *s; s++)
+		if (strstr(name, *s) != NULL)
+			return 1;
 	return 0;
 }
 
-/**
+
+/*
  * Identify sections from which references to a .init section is OK.
  *
  * Unfortunately references to read only data that referenced .init
@@ -751,114 +1186,68 @@ static int init_section(const char *name)
  *
  * where vgacon_startup is __init.  If you want to wade through the false
  * positives, take out the check for rodata.
- **/
+ */
 static int init_section_ref_ok(const char *name)
 {
 	const char **s;
 	/* Absolute section names */
 	const char *namelist1[] = {
+		"__dbe_table",		/* MIPS generate these */
+		"__ftr_fixup",		/* powerpc cpu feature fixup */
+		"__fw_ftr_fixup",	/* powerpc firmware feature fixup */
+		"__param",
+		".data.rel.ro",		/* used by parisc64 */
 		".init",
-		".opd",   /* see comment [OPD] at exit_section_ref_ok() */
-		".toc1",  /* used by ppc64 */
-		".stab",
-		".rodata",
 		".text.lock",
-		"__bug_table", /* used by powerpc for BUG() */
-		".pci_fixup_header",
-		".pci_fixup_final",
-		".pdr",
-		"__param",
 		NULL
 	};
 	/* Start of section names */
 	const char *namelist2[] = {
 		".init.",
-		".altinstructions",
-		".eh_frame",
-		".debug",
-		NULL
-	};
-	/* part of section name */
-	const char *namelist3 [] = {
-		".unwind",  /* sample: IA_64.unwind.init.text */
+		".pci_fixup",
+		".rodata",
 		NULL
 	};
 
+	if (initexit_section_ref_ok(name))
+		return 1;
+
 	for (s = namelist1; *s; s++)
 		if (strcmp(*s, name) == 0)
 			return 1;
 	for (s = namelist2; *s; s++)
 		if (strncmp(*s, name, strlen(*s)) == 0)
 			return 1;
-	for (s = namelist3; *s; s++)
-		if (strstr(name, *s) != NULL)
-			return 1;
-	return 0;
-}
 
-/*
- * Functions used only during module exit is marked __exit and is stored in
- * a .exit.text section. Likewise data is marked __exitdata and stored in
- * a .exit.data section.
- * If this section is one of these sections return 1
- * See include/linux/init.h for the details
- **/
-static int exit_section(const char *name)
-{
-	if (strcmp(name, ".exit.text") == 0)
-		return 1;
-	if (strcmp(name, ".exit.data") == 0)
+	/* If section name ends with ".init" we allow references
+	 * as is the case with .initcallN.init, .early_param.init, .taglist.init etc
+	 */
+	if (strrcmp(name, ".init") == 0)
 		return 1;
 	return 0;
-
 }
 
 /*
  * Identify sections from which references to a .exit section is OK.
- *
- * [OPD] Keith Ownes <kaos@sgi.com> commented:
- * For our future {in}sanity, add a comment that this is the ppc .opd
- * section, not the ia64 .opd section.
- * ia64 .opd should not point to discarded sections.
- **/
+ */
 static int exit_section_ref_ok(const char *name)
 {
 	const char **s;
 	/* Absolute section names */
 	const char *namelist1[] = {
-		".exit.text",
 		".exit.data",
-		".init.text",
-		".opd", /* See comment [OPD] */
-		".toc1",  /* used by ppc64 */
-		".altinstructions",
-		".pdr",
-		"__bug_table", /* used by powerpc for BUG() */
+		".exit.text",
 		".exitcall.exit",
-		".eh_frame",
-		".stab",
-		NULL
-	};
-	/* Start of section names */
-	const char *namelist2[] = {
-		".debug",
-		NULL
-	};
-	/* part of section name */
-	const char *namelist3 [] = {
-		".unwind",  /* Sample: IA_64.unwind.exit.text */
+		".rodata",
 		NULL
 	};
 
+	if (initexit_section_ref_ok(name))
+		return 1;
+
 	for (s = namelist1; *s; s++)
 		if (strcmp(*s, name) == 0)
 			return 1;
-	for (s = namelist2; *s; s++)
-		if (strncmp(*s, name, strlen(*s)) == 0)
-			return 1;
-	for (s = namelist3; *s; s++)
-		if (strstr(name, *s) != NULL)
-			return 1;
 	return 0;
 }
 
@@ -866,11 +1255,13 @@ static void read_symbols(char *modname)
 {
 	const char *symname;
 	char *version;
+	char *license;
 	struct module *mod;
 	struct elf_info info = { };
 	Elf_Sym *sym;
 
-	parse_elf(&info, modname);
+	if (!parse_elf(&info, modname))
+		return;
 
 	mod = new_module(modname);
 
@@ -881,14 +1272,28 @@ static void read_symbols(char *modname)
 		mod->skip = 1;
 	}
 
+	license = get_modinfo(info.modinfo, info.modinfo_len, "license");
+	while (license) {
+		if (license_is_gpl_compatible(license))
+			mod->gpl_compatible = 1;
+		else {
+			mod->gpl_compatible = 0;
+			break;
+		}
+		license = get_next_modinfo(info.modinfo, info.modinfo_len,
+					   "license", license);
+	}
+
 	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
 		symname = info.strtab + sym->st_name;
 
 		handle_modversions(mod, &info, sym, symname);
 		handle_moddevtable(mod, &info, sym, symname);
 	}
-	check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok);
-	check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok);
+	if (is_vmlinux(modname) && vmlinux_section_warnings) {
+		check_sec_ref(mod, modname, &info, init_section, init_section_ref_ok);
+		check_sec_ref(mod, modname, &info, exit_section, exit_section_ref_ok);
+	}
 
 	version = get_modinfo(info.modinfo, info.modinfo_len, "version");
 	if (version)
@@ -923,25 +1328,81 @@ void __attribute__((format(printf, 2, 3))) buf_printf(struct buffer *buf,
 
 	va_start(ap, fmt);
 	len = vsnprintf(tmp, SZ, fmt, ap);
-	if (buf->size - buf->pos < len + 1) {
-		buf->size += 128;
-		buf->p = realloc(buf->p, buf->size);
-	}
-	strncpy(buf->p + buf->pos, tmp, len + 1);
-	buf->pos += len;
+	buf_write(buf, tmp, len);
 	va_end(ap);
 }
 
 void buf_write(struct buffer *buf, const char *s, int len)
 {
 	if (buf->size - buf->pos < len) {
-		buf->size += len;
+		buf->size += len + SZ;
 		buf->p = realloc(buf->p, buf->size);
 	}
 	strncpy(buf->p + buf->pos, s, len);
 	buf->pos += len;
 }
 
+static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
+{
+	const char *e = is_vmlinux(m) ?"":".ko";
+
+	switch (exp) {
+	case export_gpl:
+		fatal("modpost: GPL-incompatible module %s%s "
+		      "uses GPL-only symbol '%s'\n", m, e, s);
+		break;
+	case export_unused_gpl:
+		fatal("modpost: GPL-incompatible module %s%s "
+		      "uses GPL-only symbol marked UNUSED '%s'\n", m, e, s);
+		break;
+	case export_gpl_future:
+		warn("modpost: GPL-incompatible module %s%s "
+		      "uses future GPL-only symbol '%s'\n", m, e, s);
+		break;
+	case export_plain:
+	case export_unused:
+	case export_unknown:
+		/* ignore */
+		break;
+	}
+}
+
+static void check_for_unused(enum export exp, const char* m, const char* s)
+{
+	const char *e = is_vmlinux(m) ?"":".ko";
+
+	switch (exp) {
+	case export_unused:
+	case export_unused_gpl:
+		warn("modpost: module %s%s "
+		      "uses symbol '%s' marked UNUSED\n", m, e, s);
+		break;
+	default:
+		/* ignore */
+		break;
+	}
+}
+
+static void check_exports(struct module *mod)
+{
+	struct symbol *s, *exp;
+
+	for (s = mod->unres; s; s = s->next) {
+		const char *basename;
+		exp = find_symbol(s->name);
+		if (!exp || exp->module == mod)
+			continue;
+		basename = strrchr(mod->name, '/');
+		if (basename)
+			basename++;
+		else
+			basename = mod->name;
+		if (!mod->gpl_compatible)
+			check_for_gpl_usage(exp->export, basename, exp->name);
+		check_for_unused(exp->export, basename, exp->name);
+        }
+}
+
 /**
  * Header for the generated file
  **/
@@ -962,22 +1423,31 @@ static void add_header(struct buffer *b, struct module *mod)
 		buf_printf(b, "#ifdef CONFIG_MODULE_UNLOAD\n"
 			      " .exit = cleanup_module,\n"
 			      "#endif\n");
+	buf_printf(b, " .arch = MODULE_ARCH_INIT,\n");
 	buf_printf(b, "};\n");
 }
 
 /**
  * Record CRCs for unresolved symbols
  **/
-static void add_versions(struct buffer *b, struct module *mod)
+static int add_versions(struct buffer *b, struct module *mod)
 {
 	struct symbol *s, *exp;
+	int err = 0;
 
 	for (s = mod->unres; s; s = s->next) {
 		exp = find_symbol(s->name);
 		if (!exp || exp->module == mod) {
-			if (have_vmlinux && !s->weak)
-				warn("\"%s\" [%s.ko] undefined!\n",
-				     s->name, mod->name);
+			if (have_vmlinux && !s->weak) {
+				if (warn_unresolved) {
+					warn("\"%s\" [%s.ko] undefined!\n",
+					     s->name, mod->name);
+				} else {
+					merror("\"%s\" [%s.ko] undefined!\n",
+					          s->name, mod->name);
+					err = 1;
+				}
+			}
 			continue;
 		}
 		s->module = exp->module;
@@ -986,7 +1456,7 @@ static void add_versions(struct buffer *b, struct module *mod)
 	}
 
 	if (!modversions)
-		return;
+		return err;
 
 	buf_printf(b, "\n");
 	buf_printf(b, "static const struct modversion_info ____versions[]\n");
@@ -1006,6 +1476,8 @@ static void add_versions(struct buffer *b, struct module *mod)
 	}
 
 	buf_printf(b, "};\n");
+
+	return err;
 }
 
 static void add_depends(struct buffer *b, struct module *mod,
@@ -1025,6 +1497,7 @@ static void add_depends(struct buffer *b, struct module *mod,
 	buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
 	buf_printf(b, "\"depends=");
 	for (s = mod->unres; s; s = s->next) {
+		const char *p;
 		if (!s->module)
 			continue;
 
@@ -1032,8 +1505,11 @@ static void add_depends(struct buffer *b, struct module *mod,
 			continue;
 
 		s->module->seen = 1;
-		buf_printf(b, "%s%s", first ? "" : ",",
-			   strrchr(s->module->name, '/') + 1);
+		if ((p = strrchr(s->module->name, '/')) != NULL)
+			p++;
+		else
+			p = s->module->name;
+		buf_printf(b, "%s%s", first ? "" : ",", p);
 		first = 0;
 	}
 	buf_printf(b, "\";\n");
@@ -1092,6 +1568,9 @@ static void write_if_changed(struct buffer *b, const char *fname)
 	fclose(file);
 }
 
+/* parse Module.symvers file. line format:
+ * 0x12345678<tab>symbol<tab>module[[<tab>export]<tab>something]
+ **/
 static void read_dump(const char *fname, unsigned int kernel)
 {
 	unsigned long size, pos = 0;
@@ -1103,7 +1582,7 @@ static void read_dump(const char *fname, unsigned int kernel)
 		return;
 
 	while ((line = get_next_line(&pos, file, size))) {
-		char *symname, *modname, *d;
+		char *symname, *modname, *d, *export, *end;
 		unsigned int crc;
 		struct module *mod;
 		struct symbol *s;
@@ -1114,8 +1593,10 @@ static void read_dump(const char *fname, unsigned int kernel)
 		if (!(modname = strchr(symname, '\t')))
 			goto fail;
 		*modname++ = '\0';
-		if (strchr(modname, '\t'))
-			goto fail;
+		if ((export = strchr(modname, '\t')) != NULL)
+			*export++ = '\0';
+		if (export && ((end = strchr(export, '\t')) != NULL))
+			*end = '\0';
 		crc = strtoul(line, &d, 16);
 		if (*symname == '\0' || *modname == '\0' || *d != '\0')
 			goto fail;
@@ -1127,10 +1608,10 @@ static void read_dump(const char *fname, unsigned int kernel)
 			mod = new_module(NOFAIL(strdup(modname)));
 			mod->skip = 1;
 		}
-		s = sym_add_exported(symname, mod);
+		s = sym_add_exported(symname, mod, export_no(export));
 		s->kernel    = kernel;
 		s->preloaded = 1;
-		sym_update_crc(symname, mod, crc);
+		sym_update_crc(symname, mod, crc, export_no(export));
 	}
 	return;
 fail:
@@ -1160,9 +1641,10 @@ static void write_dump(const char *fname)
 		symbol = symbolhash[n];
 		while (symbol) {
 			if (dump_sym(symbol))
-				buf_printf(&buf, "0x%08x\t%s\t%s\n",
+				buf_printf(&buf, "0x%08x\t%s\t%s\t%s\n",
 					symbol->crc, symbol->name,
-					symbol->module->name);
+					symbol->module->name,
+					export_str(symbol->export));
 			symbol = symbol->next;
 		}
 	}
@@ -1177,8 +1659,9 @@ int main(int argc, char **argv)
 	char *kernel_read = NULL, *module_read = NULL;
 	char *dump_write = NULL;
 	int opt;
+	int err;
 
-	while ((opt = getopt(argc, argv, "i:I:mo:a")) != -1) {
+	while ((opt = getopt(argc, argv, "i:I:mso:aw")) != -1) {
 		switch(opt) {
 			case 'i':
 				kernel_read = optarg;
@@ -1196,6 +1679,12 @@ int main(int argc, char **argv)
 			case 'a':
 				all_versions = 1;
 				break;
+			case 's':
+				vmlinux_section_warnings = 0;
+				break;
+			case 'w':
+				warn_unresolved = 1;
+				break;
 			default:
 				exit(1);
 		}
@@ -1213,11 +1702,19 @@ int main(int argc, char **argv)
 	for (mod = modules; mod; mod = mod->next) {
 		if (mod->skip)
 			continue;
+		check_exports(mod);
+	}
+
+	err = 0;
+
+	for (mod = modules; mod; mod = mod->next) {
+		if (mod->skip)
+			continue;
 
 		buf.pos = 0;
 
 		add_header(&buf, mod);
-		add_versions(&buf, mod);
+		err |= add_versions(&buf, mod);
 		add_depends(&buf, mod, modules);
 		add_moddevtable(&buf, mod);
 		add_srcversion(&buf, mod);
@@ -1229,5 +1726,5 @@ int main(int argc, char **argv)
 	if (dump_write)
 		write_dump(dump_write);
 
-	return 0;
+	return err;
 }