[Xen-devel] [PATCH 1 of 5] The map_count field of struct grant_table is only written to and never read

[<steven.smith@xxxxxxxxxxxxx>]

# HG changeset patch
# User Steven Smith <steven.smith@xxxxxxxxxxxxx>
# Date 1242731493 -3600
# Node ID 1954d5a3a1f5977b6d22c545cdc352bad27af528
# Parent  20b69e03fbd099226652fb9ba1540d5e93f35438
The map_count field of struct grant_table is only written to and never read.
That makes it a bit useless.  Kill it.

Signed-off-by: Steven Smith <steven.smith@xxxxxxxxxxxxx>

diff -r 20b69e03fbd0 -r 1954d5a3a1f5 xen/common/grant_table.c
--- a/xen/common/grant_table.c  Tue May 19 12:11:33 2009 +0100
+++ b/xen/common/grant_table.c  Tue May 19 12:11:33 2009 +0100
@@ -119,7 +119,6 @@
     if ( unlikely((h = t->maptrack_head) == (t->maptrack_limit - 1)) )
         return -1;
     t->maptrack_head = maptrack_entry(t, h).ref;
-    t->map_count++;
     return h;
 }
 
@@ -129,7 +128,6 @@
 {
     maptrack_entry(t, handle).ref = t->maptrack_head;
     t->maptrack_head = handle;
-    t->map_count--;
 }
 
 static inline int
diff -r 20b69e03fbd0 -r 1954d5a3a1f5 xen/include/xen/grant_table.h
--- a/xen/include/xen/grant_table.h     Tue May 19 12:11:33 2009 +0100
+++ b/xen/include/xen/grant_table.h     Tue May 19 12:11:33 2009 +0100
@@ -91,7 +91,6 @@
     struct grant_mapping **maptrack;
     unsigned int          maptrack_head;
     unsigned int          maptrack_limit;
-    unsigned int          map_count;
     /* Lock protecting updates to active and shared grant tables. */
     spinlock_t            lock;
 };

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