flex_array: export symbols to modules

Alex said:

  I want to use flex_array to store a sparse array of ATM cell
  re-assembly buffers for my ATM over Ethernet driver.  Using the per-vcc
  user_back structure causes problems when stacked with things like
  br2684.

Add EXPORT_SYMBOL() for all publically accessible flex array functions
and move to obj-y so that modules may use this library.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Reported-by: Alex Bennee <kernel-hacker@bennee.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/Makefile b/lib/Makefile
index d7b6e30a..2f59e0a 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -12,7 +12,7 @@
 	 idr.o int_sqrt.o extable.o prio_tree.o \
 	 sha1.o irq_regs.o reciprocal_div.o argv_split.o \
 	 proportions.o prio_heap.o ratelimit.o show_mem.o \
-	 is_single_threaded.o plist.o decompress.o flex_array.o
+	 is_single_threaded.o plist.o decompress.o
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
@@ -21,7 +21,7 @@
 
 obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
 	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
-	 string_helpers.o gcd.o lcm.o list_sort.o uuid.o
+	 string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o
 
 ifeq ($(CONFIG_DEBUG_KOBJECT),y)
 CFLAGS_kobject.o += -DDEBUG