vmlinux.lds.h: Create COMMON_DISCARDS

Collect the common DISCARD sections for architectures that need more
specialized discard control than what the standard DISCARDS section
provides.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-arch@vger.kernel.org
Link: https://lore.kernel.org/r/20200821194310.3089815-2-keescook@chromium.org

include/asm-generic/vmlinux.lds.h

@@ -954,13 +954,16 @@
 	EXIT_DATA
 #endif
 
+#define COMMON_DISCARDS							\
+	*(.discard)							\
+	*(.discard.*)							\
+	*(.modinfo)
+
 #define DISCARDS							\
 	/DISCARD/ : {							\
 	EXIT_DISCARDS							\
 	EXIT_CALL							\
-	*(.discard)							\
-	*(.discard.*)							\
-	*(.modinfo)							\
+	COMMON_DISCARDS							\
 	}
 
 /**