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Title: gh-83714: Check for struct statx.stx_atomic_write_unit_max_opt in configure by jbosboom · Pull Request #140185 · python/cpython · GitHub

Open Graph Title: gh-83714: Check for struct statx.stx_atomic_write_unit_max_opt in configure by jbosboom · Pull Request #140185 · python/cpython

X Title: gh-83714: Check for struct statx.stx_atomic_write_unit_max_opt in configure by jbosboom · Pull Request #140185 · python/cpython

Description: stx_atomic_write_unit_max_opt was added in Linux 6.16, but is controlled by the STATX_WRITE_ATOMIC mask bit added in Linux 6.11. That's safe at runtime because all kernels clear the reserved space in struct statx and zero is a valid value for stx_atomic_write_unit_max_opt, and it avoids allocating another mask bit, which are a limited resource. But it also means the kernel headers don't provide a way to check whether stx_atomic_write_unit_max_opt exists, so add a configure check. I ran make regen-configure. I know very little about autoconf, so please check I didn't mess up. Issue: gh-83714 📚 Documentation preview 📚: https://cpython-previews--140185.org.readthedocs.build/

Open Graph Description: stx_atomic_write_unit_max_opt was added in Linux 6.16, but is controlled by the STATX_WRITE_ATOMIC mask bit added in Linux 6.11. That's safe at runtime because all kernels clear the reserved s...

X Description: stx_atomic_write_unit_max_opt was added in Linux 6.16, but is controlled by the STATX_WRITE_ATOMIC mask bit added in Linux 6.11. That's safe at runtime because all kernels clear the reserv...

Opengraph URL: https://github.com/python/cpython/pull/140185

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37ebb56 Check for struct statx.stx_atomic_write_unit_max_opt in configure jbosboom Oct 16, 2025 https://github.com/python/cpython/pull/140185/commits/37ebb56ae78ef771120a72ed6cc025fac681becc
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