nptl: Eliminate the __static_tls_size, __static_tls_align_m1 variables

Use the  __nptl_tls_static_size_for_stack inline function instead,
and the GLRO (dl_tls_static_align) value directly.

The computation of GLRO (dl_tls_static_align)  in
_dl_determine_tlsoffset ensures that the alignment is at least
TLS_TCB_ALIGN, which at least STACK_ALIGN (see allocate_stack).
Therefore, the additional rounding-up step is removed.

ALso move the initialization of the default stack size from
__pthread_initialize_minimal_internal to __pthread_early_init.
This introduces an extra system call during single-threaded startup,
but this simplifies the initialization sequence.  No locking is
needed around the writes to __default_pthread_attr because the
process is single-threaded at this point.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/elf/dl-tls.c b/elf/dl-tls.c
index 91031c2b72..e531ec5913 100644
--- a/elf/dl-tls.c
+++ b/elf/dl-tls.c
@@ -386,8 +386,9 @@ allocate_dtv (void *result)
   return result;
 }
 
-
-/* Get size and alignment requirements of the static TLS block.  */
+/* Get size and alignment requirements of the static TLS block.  This
+   function is no longer used by glibc itself, but the GCC sanitizers
+   use it despite the GLIBC_PRIVATE status.  */
 void
 _dl_get_tls_static_info (size_t *sizep, size_t *alignp)
 {