module: trim exception table on init free.

[sfrench/cifs-2.6.git] / lib / extable.c

diff --git a/lib/extable.c b/lib/extable.c
index 179c0874559569bf2626cbfc70bfcfef09474097..4cac81ec225e09af4cfd69c36d63a574a8418110 100644 (file)
--- a/lib/extable.c
+++ b/lib/extable.c
@@ -39,7 +39,26 @@ void sort_extable(struct exception_table_entry *start,
        sort(start, finish - start, sizeof(struct exception_table_entry),
             cmp_ex, NULL);
 }
-#endif
+
+#ifdef CONFIG_MODULES
+/*
+ * If the exception table is sorted, any referring to the module init
+ * will be at the beginning or the end.
+ */
+void trim_init_extable(struct module *m)
+{
+       /*trim the beginning*/
+       while (m->num_exentries && within_module_init(m->extable[0].insn, m)) {
+               m->extable++;
+               m->num_exentries--;
+       }
+       /*trim the end*/
+       while (m->num_exentries &&
+               within_module_init(m->extable[m->num_exentries-1].insn, m))
+               m->num_exentries--;
+}
+#endif /* CONFIG_MODULES */
+#endif /* !ARCH_HAS_SORT_EXTABLE */
 
 #ifndef ARCH_HAS_SEARCH_EXTABLE
 /*