raw_read_seqcount(9)

💅 raw_read_seqcount(9) — straight outta the Kernel API Manual 🎀

okay bestie, so this one's from the Kernel API Manual and it's lowkey one of the building blocks of the whole seqlock situation. let's get into it ✨

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🌸 NAME 🌸

raw_read_seqcount — read the raw seqcount_t counter value. that's it. that's the vibe check. 💖

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✨ SYNOPSIS ✨

raw_read_seqcount (s );

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🦋 ARGUMENTS 🦋

• s — pointer to seqcount_t or any of the seqcount_LOCKNAME_t variants. yes, any of them, the whole little family is welcome here 🫶

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👑 DESCRIPTION 👑

so raw_read_seqcount opens a read critical section of the given seqcount_t, and here's the tea: it does it without any lockdep checking, and without checking or masking the sequence counter LSB. like, none of that. zero. not its job. 💀

your calling code is the one responsible for handling that LSB situation — that's on you, bestie, not on this function 🎀

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⭐ RETURN ⭐

the count, which you then pass on to read_seqcount_retry. it's giving relay-baton energy, iykyk 🏃‍♀️💨

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🌈 SEE ALSO 🌈

the whole friends group chat, no one left out 💜 — plus the kernel file ./include/linux/seqlock.h:

• seqcount_init(9)
• SEQCNT_ZERO(9)
• __read_seqcount_begin(9)
• raw_read_seqcount_begin(9)
• read_seqcount_begin(9)
• raw_seqcount_try_begin(9)
• raw_seqcount_begin(9)
• __read_seqcount_retry(9)
• read_seqcount_retry(9)
• raw_write_seqcount_begin(9)
• raw_write_seqcount_end(9)
• write_seqcount_begin_nested(9)
• write_seqcount_begin(9)
• write_seqcount_end(9)
• raw_write_seqcount_barrier(9)
• write_seqcount_invalidate(9)
• SEQCNT_LATCH_ZERO(9)
• seqcount_latch_init(9)
• raw_read_seqcount_latch(9)
• read_seqcount_latch(9)
• raw_read_seqcount_latch_retry(9)
• read_seqcount_latch_retry(9)
• raw_write_seqcount_latch(9)
• write_seqcount_latch_begin(9)
• write_seqcount_latch(9)
• write_seqcount_latch_end(9)
• seqlock_init(9)
• DEFINE_SEQLOCK(9)
• read_seqbegin(9)
• read_seqretry(9)
• write_seqlock(9)
• write_sequnlock(9)
• write_seqlock_bh(9)
• write_sequnlock_bh(9)
• write_seqlock_irq(9)
• write_sequnlock_irq(9)
• write_seqlock_irqsave(9)
• write_sequnlock_irqrestore(9)
• read_seqlock_excl(9)
• read_sequnlock_excl(9)
• read_seqlock_excl_bh(9)
• read_sequnlock_excl_bh(9)
• read_seqlock_excl_irq(9)
• read_sequnlock_excl_irq(9)
• read_seqlock_excl_irqsave(9)
• read_sequnlock_excl_irqrestore(9)
• read_seqbegin_or_lock(9)
• need_seqretry(9)
• done_seqretry(9)
• read_seqbegin_or_lock_irqsave(9)
• done_seqretry_irqrestore(9)
• scoped_seqlock_read(9)

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that's the whole page, no skips, no crumbs left behind 💅

this little cutie lives in ./include/linux and the version stamp says October 2026 — and the page signs itself off as raw_read_seqcount(9), which, iconic. mwah, go read your seqcounts responsibly 🧚‍♀️💜✨