[PATCH] i386: fix rwsem build bug on CONFIG_M386=y

CONFIG_M386 turns on spinlock-based generic rwsems - which surprises the
semaphore.S rwsem stubs. Tested both with and without CONFIG_M386.
Reported-by: NKlaus Knopper <knopper@knopper.net>
Triaged-by: NAdrian Bunk <bunk@stusta.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAndi Kleen <ak@suse.de>

arch/i386/lib/semaphore.S

@@ -152,6 +152,8 @@ ENTRY(__read_lock_failed)
 
 #endif
 
+#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
+
 /* Fix up special calling conventions */
 ENTRY(call_rwsem_down_read_failed)
 	CFI_STARTPROC
@@ -214,3 +216,4 @@ ENTRY(call_rwsem_downgrade_wake)
 	CFI_ENDPROC
 	END(call_rwsem_downgrade_wake)
 
+#endif