malloc: Use __libc_initial to detect an inner libc

The secondary/non-primary/inner libc (loaded via dlmopen, LD_AUDIT,
static dlopen) must not use sbrk to allocate member because that would
interfere with allocations in the outer libc.  On Linux, this does not
matter because sbrk itself was changed to fail in secondary libcs.

 _dl_addr occasionally shows up in profiles, but had to be used before
because __libc_multiple_libs was unreliable.  So this change achieves
a slight reduction in startup time.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 5 insertions, 8 deletions

diff --git a/malloc/arena.c b/malloc/arena.c
index 202daf15b0..3c9c0ecd86 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -294,14 +294,11 @@ ptmalloc_init (void)
   __malloc_initialized = 0;
 
 #ifdef SHARED
-  /* In case this libc copy is in a non-default namespace, never use brk.
-     Likewise if dlopened from statically linked program.  */
-  Dl_info di;
-  struct link_map *l;
-
-  if (_dl_open_hook != NULL
-      || (_dl_addr (ptmalloc_init, &di, &l, NULL) != 0
-          && l->l_ns != LM_ID_BASE))
+  /* In case this libc copy is in a non-default namespace, never use
+     brk.  Likewise if dlopened from statically linked program.  The
+     generic sbrk implementation also enforces this, but it is not
+     used on Hurd.  */
+  if (!__libc_initial)
     __morecore = __failing_morecore;
 #endif