lc_is_used(9)

🌸 NAME 🌸

lc_is_used — find element by label. Yeah bestie, this is the lc_is_used(9) page from the Kernel API Manual, and we're gonna vibe through it together 🫶✨

✨ SYNOPSIS ✨

bool lc_is_used (struct lru_cache *lc , unsigned int enr );

🎀 ARGUMENTS 🎀

• lc — the lru_cache object. She's the main character of this function 💅
• enr — element number. The little label/number you're checking for 👑

💅 DESCRIPTION 💅

Okay so this one returns true if the element with the requested "label" or element number is present in the hash table, and it's used (refcnt > 0). Slay ✅

It also finds elements that are not _currently_ used but only "about to be used" — i.e. on the "to_be_changed" list, pending transaction commit. So not just the currently-used girlies, but the pending-transaction girlies too 👀🔥

🦋 SEE ALSO 🦋

Kernel file ./lib/lru_cache.c is the source, and here's the whole squad:

• lc_create(9)
• lc_destroy(9)
• lc_reset(9)
• lc_seq_printf_stats(9)
• lc_find(9)
• lc_del(9)
• lc_get(9)
• lc_get_cumulative(9)
• lc_try_get(9)
• lc_committed(9)
• lc_put(9)
• lc_element_by_index(9)
• lc_seq_dump_details(9)

Source/version + date vibes: ./lib · October 2026 · lc_is_used(9) — xoxo, the kernel girls 💖🫶🎀