mt_for_each(9)

🌸 NAME 🌸

okay so bestie, this is mt_for_each(9) from the Kernel API Manual, and it’s giving tiny iterator macro with main character energy ✨. It’s literally here to iterate over each entry starting at index until max. That’s highkey the whole gig. Iconic. Periodt 💅

✨ SYNOPSIS ✨

mt_for_each (__tree , __entry , __index , __max );

🎀 ARGUMENTS 🎀

• __tree — The Maple Tree. Yes, the tree itself, the whole vibe 🌳.
• __entry — The current entry. Like, the one you’re on right now in the loop 👀.
• __index — The index to start the search from. Subsequently used as iterator. So it starts the search and then keeps doing iterator duty — lowkey a double shift 💅.
• __max — The maximum limit for index. The ceiling, the cap, the “that’s enough” line 🛑.

🦋 DESCRIPTION 🦋

This iterator skips all entries, which resolve to a NULL pointer, e.g. entries which has been reserved with XA_ZERO_ENTRY. No cap, it just quietly passes over them like “not my entry, not my problem” 🙈. Keep that in mind so you don’t get confused when your loop behaves like it’s skipping stuff — because it literally is 💀.

bestie note: the skip is for entries that resolve to a NULL pointer, and XA_ZERO_ENTRY-reserved entries are the example. That’s the tea ☕.

💖 SEE ALSO 💖

• Kernel file ./include/linux/maple_tree.h
• Maple tree flags(9)
• MTREE_INIT(9)
• MTREE_INIT_EXT(9)
• mtree_empty(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)

xoxo, your kernel bestie 🫶 — this mt_for_each(9) moment comes from source/version ./include/linux, dated October 2026. Bye bestie, go iterate slayfully 💅✨