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-rw-r--r--libpthread/nptl/pthread_create.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/libpthread/nptl/pthread_create.c b/libpthread/nptl/pthread_create.c
index 63e5588d5..86ff1488b 100644
--- a/libpthread/nptl/pthread_create.c
+++ b/libpthread/nptl/pthread_create.c
@@ -379,11 +379,11 @@ start_thread (void *arg)
/* Mark the memory of the stack as usable to the kernel. We free
everything except for the space used for the TCB itself. */
size_t pagesize_m1 = __getpagesize () - 1;
-#ifdef _STACK_GROWS_DOWN
char *sp = CURRENT_STACK_FRAME;
+#ifdef _STACK_GROWS_DOWN
size_t freesize = (sp - (char *) pd->stackblock) & ~pagesize_m1;
#else
-# error "to do"
+ size_t freesize = ((char *) pd->stackblock - sp) & ~pagesize_m1;
#endif
assert (freesize < pd->stackblock_size);
if (freesize > PTHREAD_STACK_MIN)