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-rw-r--r--malloc/arena.c13
-rw-r--r--malloc/malloc.c9
2 files changed, 19 insertions, 3 deletions
diff --git a/malloc/arena.c b/malloc/arena.c
index d0d223e94e..4d95462f26 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -1,5 +1,5 @@
 /* Malloc implementation for multiple threads without lock contention.
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2001,2002,2003,2004,2005,2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Wolfram Gloger <wg@malloc.de>, 2001.
 
@@ -55,9 +55,18 @@ typedef struct _heap_info {
   mstate ar_ptr; /* Arena for this heap. */
   struct _heap_info *prev; /* Previous heap. */
   size_t size;   /* Current size in bytes. */
-  size_t pad;    /* Make sure the following data is properly aligned. */
+  /* Make sure the following data is properly aligned, particularly
+     that sizeof (heap_info) + 2 * SIZE_SZ is a multiple of
+     MALLOG_ALIGNMENT. */
+  char pad[-5 * SIZE_SZ & MALLOC_ALIGN_MASK];
 } heap_info;
 
+/* Get a compile-time error if the heap_info padding is not correct
+   to make alignment work as expected in sYSMALLOc.  */
+extern int sanity_check_heap_info_alignment[(sizeof (heap_info)
+					     + 2 * SIZE_SZ) % MALLOC_ALIGNMENT
+					    ? -1 : 1];
+
 /* Thread specific data */
 
 static tsd_key_t arena_key;
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 99b55c8639..5fbd268fed 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1,5 +1,5 @@
 /* Malloc implementation for multiple threads without lock contention.
-   Copyright (C) 1996-2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 1996-2002,2003,2004,2005,2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Wolfram Gloger <wg@malloc.de>
    and Doug Lea <dl@cs.oswego.edu>, 2001.
@@ -381,8 +381,15 @@ extern "C" {
 
 
 #ifndef MALLOC_ALIGNMENT
+/* XXX This is the correct definition.  It differs from 2*SIZE_SZ only on
+   powerpc32.  For the time being, changing this is causing more
+   compatibility problems due to malloc_get_state/malloc_set_state than
+   will returning blocks not adequately aligned for long double objects
+   under -mlong-double-128.  */
 #define MALLOC_ALIGNMENT       (2 * SIZE_SZ < __alignof__ (long double) \
 				? __alignof__ (long double) : 2 * SIZE_SZ)
+*/
+#define MALLOC_ALIGNMENT       (2 * SIZE_SZ)
 #endif
 
 /* The corresponding bit mask value */