xa_set_mark(9)

✨ xa_set_mark(9) ✨

okay so bestie, welcome to the <pink>Kernel API Manual</pink> — today's main character is xa_set_mark(9) and she is, and I cannot stress this enough, so specific about what she will and will not do. 🎀

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💖 NAME 💖

xa_set_mark — set this mark on this entry. that's it. that's the whole gig. no cap. ✨

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🌸 SYNOPSIS 🌸

void xa_set_mark (struct xarray *xa , unsigned long index , xa_mark_t
mark );

like look at her. three params, zero drama (until you pass a NULL entry, we'll get there). 💅

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🦋 ARGUMENTS 🦋

• xa — the XArray. the whole vibe container, your girl squad of entries. 🫶
• index — index of entry. which one of the girlies we're talking about. literally just the slot number.
• mark — mark number. the little sticky note 📝 you're slapping on her.

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🧚 DESCRIPTION 🧚

so here's the tea: attempting to set a mark on a <red>NULL</red> entry does not succeed. read that again. if the entry is NULL, she's not taking the mark, no matter how cute it is. not me tryna tag a ghost 💀 — it's giving "the vibes are simply not there." fr fr, the operation just won't land.

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⭐ CONTEXT ⭐

process context, bestie. she takes and releases the xa_lock — so she's polite, she locks up, does her thing, hands the key back. 🔐 no funny business.

🙈 lowkey important: she grabs xa_lock, so don't go thinking this is some lock-free free-for-all. it is not, and I would never lie to you.

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🌈 SEE ALSO 🌈

the whole extended friend group, live from the kernel file ./lib/xarray.c 👑

the xas_* girlies:

• xas_load(9), xas_nomem(9), xas_free_nodes(9), xas_create_range(9), xas_store(9), xas_get_mark(9), xas_set_mark(9), xas_clear_mark(9), xas_init_marks(9), xas_split_alloc(9), xas_split(9), xas_try_split_min_order(9), xas_try_split(9), xas_pause(9), xas_find(9), xas_find_marked(9), xas_find_conflict(9), xas_get_order(9)

and the xa/__xa side of the family:

• xa_load(9), __xa_erase(9), xa_erase(9), __xa_store(9), xa_store(9), __xa_cmpxchg(9), __xa_insert(9), xa_store_range(9), xa_get_order(9), __xa_alloc(9), __xa_alloc_cyclic(9), __xa_set_mark(9), __xa_clear_mark(9), xa_get_mark(9), xa_clear_mark(9), xa_find(9), xa_find_after(9), xa_extract(9), xa_delete_node(9), xa_destroy(9)

go follow all of them, they're iconic. 🔥

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and that's the page!! 💜 this one lives in ./lib, dated October 2026 — mwah, love that for us. stay hydrated, read your xarray.c, and remember: no marking NULL entries. periodt. 🎀✨