merge trunk

2 files changed, 8 insertions, 9 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index dedf10b8e2d..71465cc9b86 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2012-10-10  Dmitry Antipov  <dmantipov@yandex.ru>
+
+        * alloc.c (gc_sweep): Use pointer-to-a-pointer loop for buffers.
+
 2012-10-10  Paul Eggert  <eggert@cs.ucla.edu>
 
         * commands.h (immediate_quit): Remove duplicate decl.
diff --git a/src/alloc.c b/src/alloc.c
index 3ed8cc2d990..0cbdef84c4a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -6311,19 +6311,14 @@ gc_sweep (void)
 
   /* Free all unmarked buffers */
   {
-    register struct buffer *buffer = all_buffers, *prev = 0, *next;
+    register struct buffer *buffer, **bprev = &all_buffers;
 
     total_buffers = 0;
-    while (buffer)
+    for (buffer = all_buffers; buffer; buffer = *bprev)
       if (!VECTOR_MARKED_P (buffer))
         {
-          if (prev)
-            prev->header.next = buffer->header.next;
-          else
-            all_buffers = buffer->header.next.buffer;
-          next = buffer->header.next.buffer;
+          *bprev = buffer->header.next.buffer;
           lisp_free (buffer);
-          buffer = next;
         }
       else
         {
@@ -6331,7 +6326,7 @@ gc_sweep (void)
           /* Do not use buffer_(set|get)_intervals here.  */
           buffer->text->intervals = balance_intervals (buffer->text->intervals);
           total_buffers++;
-          prev = buffer, buffer = buffer->header.next.buffer;
+          bprev = &buffer->header.next.buffer;
         }
   }