STRUCT FUTEX_UNLOCK_CS_RANGE(9)

💅 NAME 💅

struct futex_unlock_cs_range — bestie, this is the range for the VDSO unlock critical section ✨ (and yes, it's from the Kernel API Manual, we're doing big-kid kernel stuff today 🎀)

✨ SYNOPSIS ✨

struct futex_unlock_cs_range {
    unsigned long          start_ip;
    unsigned int           len;
    unsigned int           pop_size32;
 };

That's the whole struct, no cap 🫶

🌸 Members 🌸

• start_ip — the start IP of the robust futex unlock critical section, and it's inclusive ok so don't forget that part 💖
• len — the length of the robust futex unlock critical section 📏
• pop_size32 — the Pending OP pointer size indicator 👑 and the vibes are: 0 == 64-bit, 1 == 32-bit. literally just those two, that's the whole personality 🦋

🌈 SEE ALSO 🌈

Kernel file ./include/linux/futex_types.h plus its little friend group: struct futex_sched_data(9), struct futex_mm_phash(9), struct futex_unlock_cs_ranges(9), struct futex_mm_data(9) 💜 (yes futex_unlock_cs_ranges with the s is a different one than this page, don't get it twisted 🙈)

ok that's the whole page, you ate that 💅 this one lives in ./include/linux and it's dated October 2026, so like, future-coded of it ⭐ bye bestie, go unlock some critical sections responsibly 🧚‍♀️🌸