module: remove EXPORT_UNUSED_SYMBOL*

EXPORT_UNUSED_SYMBOL* is not actually used anywhere.  Remove the
unused functionality as we generally just remove unused code anyway.

Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jessica Yu <jeyu@kernel.org>

4 files changed, 5 insertions, 46 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 92e888ed939f..eabd2d5467b1 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4290,8 +4290,7 @@ sub process {
 		if (defined $realline_next &&
 		    exists $lines[$realline_next - 1] &&
 		    !defined $suppress_export{$realline_next} &&
-		    ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
-		     $lines[$realline_next - 1] =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
+		    ($lines[$realline_next - 1] =~ /EXPORT_SYMBOL.*\((.*)\)/)) {
 			# Handle definitions which produce identifiers with
 			# a prefix:
 			#   XXX(foo);
@@ -4318,8 +4317,7 @@ sub process {
 		}
 		if (!defined $suppress_export{$linenr} &&
 		    $prevline =~ /^.\s*$/ &&
-		    ($line =~ /EXPORT_SYMBOL.*\((.*)\)/ ||
-		     $line =~ /EXPORT_UNUSED_SYMBOL.*\((.*)\)/)) {
+		    ($line =~ /EXPORT_SYMBOL.*\((.*)\)/)) {
 #print "FOO B <$lines[$linenr - 1]>\n";
 			$suppress_export{$linenr} = 2;
 		}
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 25c1446055d1..20fc57837881 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -43,8 +43,9 @@ static int allow_missing_ns_imports;
 static bool error_occurred;
 
 enum export {
-	export_plain,      export_unused,     export_gpl,
-	export_unused_gpl, export_unknown
+	export_plain,
+	export_gpl,
+	export_unknown
 };
 
 /* In kernel, this size is defined in linux/module.h;
@@ -301,9 +302,7 @@ static const struct {
 	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 = "(unknown)",                .export = export_unknown },
 };
 
@@ -362,12 +361,8 @@ static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
 
 	if (strstarts(secname, "___ksymtab+"))
 		return export_plain;
-	else if (strstarts(secname, "___ksymtab_unused+"))
-		return export_unused;
 	else if (strstarts(secname, "___ksymtab_gpl+"))
 		return export_gpl;
-	else if (strstarts(secname, "___ksymtab_unused_gpl+"))
-		return export_unused_gpl;
 	else
 		return export_unknown;
 }
@@ -376,12 +371,8 @@ static enum export export_from_sec(struct elf_info *elf, unsigned int 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
 		return export_unknown;
 }
@@ -585,12 +576,8 @@ static int parse_elf(struct elf_info *info, const char *filename)
 			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;
 
 		if (sechdrs[i].sh_type == SHT_SYMTAB) {
 			unsigned int sh_link_idx;
@@ -2141,32 +2128,13 @@ static void check_for_gpl_usage(enum export exp, const char *m, const char *s)
 		error("GPL-incompatible module %s.ko uses GPL-only symbol '%s'\n",
 		      m, s);
 		break;
-	case export_unused_gpl:
-		error("GPL-incompatible module %s.ko uses GPL-only symbol marked UNUSED '%s'\n",
-		      m, 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)
-{
-	switch (exp) {
-	case export_unused:
-	case export_unused_gpl:
-		warn("module %s.ko uses symbol '%s' marked UNUSED\n",
-		     m, s);
-		break;
-	default:
-		/* ignore */
-		break;
-	}
-}
-
 static void check_exports(struct module *mod)
 {
 	struct symbol *s, *exp;
@@ -2197,7 +2165,6 @@ static void check_exports(struct module *mod)
 
 		if (!mod->gpl_compatible)
 			check_for_gpl_usage(exp->export, basename, exp->name);
-		check_for_unused(exp->export, basename, exp->name);
 	}
 }
 
diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index 834220de002b..0c47ff95c0e2 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -139,9 +139,7 @@ struct elf_info {
 	Elf_Sym      *symtab_start;
 	Elf_Sym      *symtab_stop;
 	Elf_Section  export_sec;
-	Elf_Section  export_unused_sec;
 	Elf_Section  export_gpl_sec;
-	Elf_Section  export_unused_gpl_sec;
 	char         *strtab;
 	char	     *modinfo;
 	unsigned int modinfo_len;
diff --git a/scripts/module.lds.S b/scripts/module.lds.S
index d82b452e8a71..24e8af579ce3 100644
--- a/scripts/module.lds.S
+++ b/scripts/module.lds.S
@@ -11,12 +11,8 @@ SECTIONS {
 
 	__ksymtab		0 : { *(SORT(___ksymtab+*)) }
 	__ksymtab_gpl		0 : { *(SORT(___ksymtab_gpl+*)) }
-	__ksymtab_unused	0 : { *(SORT(___ksymtab_unused+*)) }
-	__ksymtab_unused_gpl	0 : { *(SORT(___ksymtab_unused_gpl+*)) }
 	__kcrctab		0 : { *(SORT(___kcrctab+*)) }
 	__kcrctab_gpl		0 : { *(SORT(___kcrctab_gpl+*)) }
-	__kcrctab_unused	0 : { *(SORT(___kcrctab_unused+*)) }
-	__kcrctab_unused_gpl	0 : { *(SORT(___kcrctab_unused_gpl+*)) }
 
 	.init_array		0 : ALIGN(8) { *(SORT(.init_array.*)) *(.init_array) }