[PATCH] do not use shared extable code for ia64

From: Jes Sorensen <jes@trained-monkey.org>

The new sort_extable and shared search_extable code doesn't work on ia64.
I have introduced two new #defines that archs can define to avoid the
common code being built.  ARCH_HAS_SEARCH_EXTABLE and
ARCH_HAS_SORT_EXTABLE.

include/asm-ia64/uaccess.h

@@ -281,6 +281,9 @@ extern unsigned long __strnlen_user (const char *, long);
 	__su_ret;						\
 })
 
+#define ARCH_HAS_SORT_EXTABLE
+#define ARCH_HAS_SEARCH_EXTABLE
+
 struct exception_table_entry {
 	int addr;	/* gp-relative address of insn this fixup is for */
 	int cont;	/* gp-relative continuation address; if bit 2 is set, r9 is set to 0 */

lib/extable.c

@@ -18,6 +18,7 @@
 extern struct exception_table_entry __start___ex_table[];
 extern struct exception_table_entry __stop___ex_table[];
 
+#ifndef ARCH_HAS_SORT_EXTABLE
 /*
  * The exception table needs to be sorted so that the binary
  * search that we use to find entries in it works properly.
@@ -45,7 +46,9 @@ void sort_extable(struct exception_table_entry *start,
 		}
 	}
 }
+#endif
 
+#ifndef ARCH_HAS_SEARCH_EXTABLE
 /*
  * Search one exception table for an entry corresponding to the
  * given instruction address, and return the address of the entry,
@@ -75,3 +78,4 @@ search_extable(const struct exception_table_entry *first,
         }
         return NULL;
 }
+#endif