*8 is probably overkill


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2058 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/memcheck/tests/sigaltstack.c b/memcheck/tests/sigaltstack.c
index f8aeff9..f310df5 100644
--- a/memcheck/tests/sigaltstack.c
+++ b/memcheck/tests/sigaltstack.c
@@ -14,7 +14,7 @@
   int res, i;
   stack_t sigstk;
   struct sigaction act;
-  static const int size = SIGSTKSZ*8;
+  static const int size = SIGSTKSZ*2;
   char *stk = (char *)mmap(0, size, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
   sigstk.ss_sp = stk;