need_wear_leveling(9)

💅 need_wear_leveling(9) — a Kernel API Manual moment

okay so bestie, grab your matcha 🍵 because we're talking about need_wear_leveling(9) — yes that's the manual name and yes it's giving "I have a very specific job and I do it well" energy.

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✨ NAME ✨

need_wear_leveling — checks whether to trigger a wear leveling work. UBI fetches free PEB from wl_pool, we check free PEBs from both 'wl_pool' and 'ubi->free', because free PEB in 'ubi->free' tree maybe moved into 'wl_pool' by ubi_refill_pools().

like literally that's the whole vibe: it's the little function that looks at your free PEBs in two places at once and goes "hmm, should we start a wear leveling work? 👀" because a free PEB sitting in 'ubi->free' might get scooted over into 'wl_pool' by ubi_refill_pools(), and you gotta check both or you're not seeing the whole picture, no cap. 🦋

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🌸 SYNOPSIS 🌸

bool need_wear_leveling (struct ubi_device *ubi );

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🎀 ARGUMENTS 🎀

• ubi — UBI device description object (your main character, fr — the whole UBI device, described and handed over so we know what we're looking at 💖)

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🔥 SEE ALSO 🔥

the lore continues in the kernel file ./drivers/mtd/ubi/fastmap-wl.c — go read these besties, they're all linked and they all ate:

• update_fastmap_work_fn(9)
• find_anchor_wl_entry(9)
• return_unused_pool_pebs(9)
• ubi_wl_get_fm_peb(9)
• ubi_refill_pools_and_lock(9)
• produce_free_peb(9)
• ubi_wl_get_peb(9)
• next_peb_for_wl(9)
• ubi_ensure_anchor_pebs(9)
• ubi_wl_put_fm_peb(9)
• ubi_is_erase_work(9)
• may_reserve_for_fm(9)

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💀 reminder that this lives in ./drivers/mtd/ubi — that's the neighborhood, iykyk.

and that's the page!! mwah 🫶 this beauty comes from ./drivers/mtd/ubi, dated October 2026, and it's called need_wear_leveling(9) — iconic, no notes, periodt. 👑💜