ANDROID: binder: show high watermark of alloc->pages.

Show the high watermark of the index into the alloc->pages
array, to facilitate sizing the buffer on a per-process
basis.

Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/android/binder_alloc.h

@@ -92,6 +92,7 @@ struct binder_lru_page {
  * @pages:              array of binder_lru_page
  * @buffer_size:        size of address space specified via mmap
  * @pid:                pid for associated binder_proc (invariant after init)
+ * @pages_high:         high watermark of offset in @pages
  *
  * Bookkeeping structure for per-proc address space management for binder
  * buffers. It is normally initialized during binder_init() and binder_mmap()
@@ -112,6 +113,7 @@ struct binder_alloc {
 	size_t buffer_size;
 	uint32_t buffer_free;
 	int pid;
+	size_t pages_high;
 };
 
 #ifdef CONFIG_ANDROID_BINDER_IPC_SELFTEST