PING: [PATCH v4] Use 64-bit atomic on sem_t with 8-byte alignment [BZ #33632]

[H.J. Lu]

On Sat, Nov 22, 2025 at 6:57 AM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> commit 7fec8a5de6826ef9ae440238d698f0fe5a5fb372
> Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> Date:   Thu Nov 13 14:26:08 2025 -0300
>
>     Revert __HAVE_64B_ATOMICS configure check
>
> uses 64-bit atomic operations on sem_t if 64-bit atomics are supported.
> But sem_t may be aligned to 32-bit on 32-bit architectures.
>
> 1. Add a macro, SEM_T_ALIGN, for sem_t alignment.
> 2. Add a macro, HAVE_UNALIGNED_64B_ATOMICS.  Define it if unaligned 64-bit
> atomic operations are supported.
> 3. Add a macro, USE_64B_ATOMICS_ON_SEM_T.  Define to 1 if 64-bit atomic
> operations are supported and SEM_T_ALIGN is at least 8-byte aligned or
> HAVE_UNALIGNED_64B_ATOMICS is defined.
> 4. Assert that size and alignment of sem_t are not lower than those of
> the internal struct new_sem.
> 5. Check USE_64B_ATOMICS_ON_SEM_T, instead of USE_64B_ATOMICS, when using
> 64-bit atomic operations on sem_t.
>
> This fixes BZ #33632.
>
> --
> H.J.

PING.

-- 
H.J.