local_trylock(9)

🌸 NAME 🌸

okay so this is local_trylock(9) from the Kernel API Manual, and the whole point is: local_trylock — try to acquire a per CPU local lock 💅

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✨ SYNOPSIS ✨

the signature, literally:

local_trylock (lock );

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🎀 ARGUMENTS 🎀

• lock — the lock variable. that's the arg, bestie 🫶

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💫 DESCRIPTION 💫

okay so this function can be used in any context, such as NMI or HARDIRQ. iconic.

but due to locking constrains it will _always_ fail to acquire the lock in NMI or HARDIRQ context on PREEMPT_RT. no cap, that's the caveat 😭

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🦋 SEE ALSO 🦋

the squad, plus the kernel file:

• Kernel file ./include/linux/local_lock.h
• local_lock_init(9)
• local_lock(9)
• local_lock_irq(9)
• local_lock_irqsave(9)
• local_unlock(9)
• local_unlock_irq(9)
• local_unlock_irqrestore(9)
• local_trylock_init(9)
• local_trylock_irqsave(9)

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mwah 💋 — source/version: ./include/linux; date: October 2026; page: local_trylock(9). periodt 🌈