mas_preallocate(9)

💅 mas_preallocate(9) — the kernel API manual, bestie edition 🎀

okay so real talk, this one lives in the Kernel API Manual and it's called mas_preallocate — and yes it's exactly what it sounds like, it's the "get your nodes ready before the store" girlie ✨

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🌸 NAME 🌸

mas_preallocate — preallocate enough nodes for a store operation 🫶

like, reserve your space ahead of time so the actual store doesn't have to panic-allocate mid-vibe. iconic planning behavior, honestly 👑

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✨ SYNOPSIS ✨

int mas_preallocate (struct ma_state *mas , void *entry , gfp_t gfp );

three args, one int back, no cap 💅

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🦋 ARGUMENTS 🦋

• mas — the maple state 🍓 (yes, the whole struct ma_state *, she's the main character here)
• entry — the entry that will be stored 🌈 like, the thing you're eventually gonna put in there, this call just preps for it
• gfp — the GFP_FLAGS to use for allocations 🌸 so the allocation vibes are entirely your call

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💖 RETURN 💖

• 0 on success — slay, you're preallocated 🎉
• -ENOMEM if memory could not be allocated 😭 the classic "bestie the allocator said no" moment

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🔥 SEE ALSO 🔥

Kernel file ./lib/maple_tree.c and honestly the whole maple tree friend group, gather round:

mas_prealloc_calc(9), mas_wr_preallocate(9), mas_insert(9), mas_alloc_cyclic(9), mas_walk(9), mte_dead_walk(9), mt_free_walk(9), mas_store(9), mas_store_gfp(9), mas_store_prealloc(9), mas_next(9), mas_next_range(9), mt_next(9), mas_prev(9), mas_prev_range(9), mt_prev(9), mas_pause(9), mas_find_setup(9), mas_find(9), mas_find_range(9), mas_find_rev_setup(9), mas_find_rev(9), mas_find_range_rev(9), mas_erase(9), mas_nomem(9), mas_nomem_nofail(9), mtree_load(9), mtree_store_range(9), mtree_store(9), mtree_insert_range(9), mtree_insert(9), mtree_alloc_cyclic(9), mtree_erase(9), __mt_dup(9), mtree_dup(9), __mt_destroy(9), mtree_destroy(9), mt_find(9), mt_find_after(9) 💜

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ngl the whole maple tree API is a vibe, go read the neighbors, they're all linked above 👆✨

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and that's the page, bestie 🧚 from ./lib, dated October 2026, filed under mas_preallocate(9) — go preallocate responsibly, ily, mwah 💋💖