mtree_empty(9)

💅 mtree_empty — okay bestie, is this tree actually empty or not

Hi hi! Welcome to the mtree_empty(9) page from the Kernel API Manual — yes we're in the kernel docs now, and yes we're gonna slay it. Stick around, this one is short and sweet. 🍓

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🌸 NAME

mtree_empty — literally just tells you if a tree has any present entries. That's it. That's the whole vibe check. ✨

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🎀 SYNOPSIS

bool mtree_empty (const struct maple_tree *mt );

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🦋 ARGUMENTS

• mt — the Maple Tree. That's the tree we're asking about. No cap, that's the entire argument list. 💅

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💖 CONTEXT

Any context. Any. Context. Doesn't matter where you call it from, she's chill like that. 🧚

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⭐ RETURN

Returns true if the tree contains only NULL pointers. So like — if everything in there is a NULL pointer, you get true. If there's anything actually present, nope. 🫶

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👑 SEE ALSO

• Kernel file ./include/linux/maple_tree.h 🌈
• Maple tree flags(9)
• MTREE_INIT(9)
• MTREE_INIT_EXT(9)
• mas_reset(9)
• mas_for_each(9)
• mas_for_each_rev(9)
• __mas_set_range(9)
• mas_set_range(9)
• mas_set(9)
• mt_init_flags(9)
• mt_init(9)
• mt_clear_in_rcu(9)
• mt_set_in_rcu(9)
• mt_for_each(9)

All of those are linked above, fr fr — go click around, it's giving maple tree lore. 🔥

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💀 reminder: true means only NULL pointers live in there. Not "kind of empty". Not "empty-ish". Only NULL. Periodt.

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And that's the page, bestie! 🎀 This little baddie lives in ./include/linux and was dated October 2026 — so mark your calendar, mwah 💜👑