genradix_iter_peek_prev(9)

🌸 NAME 🌸

genradix_iter_peek_prev — ok so this one gets you the first entry at or below the iterator's current position 💅 (yes, below, it walks backwards bestie, reverse slay ✨)

This is a page from the Kernel API Manual, btw — we're in kernel-land now 🧚

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✨ SYNOPSIS ✨

genradix_iter_peek_prev (_iter , _radix );

periodt. that's the whole call. look at her go 🫶

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🎀 ARGUMENTS 🎀

• _iter — a genradix_iter, aka the iterator bestie doing the walking. she's already got a current position and she knows it 💁‍♀️
• _radix — the genradix being iterated over. like, the actual tree-thing you're strolling through 🌳

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💖 DESCRIPTION 💖

Ok so here's the tea ☕: if no more entries exist at or below _iter's current position, this thing returns NULL. That's it. That's the whole vibe.

So like — you're poking backwards through your entries, and when there's literally nothing left down there, you get NULL back 😭 not an error, not a crash, just a very polite "nope, we're done here, nothing below" 🦋

ngl bestie, always check for that NULL before you go dereferencing it 💀 that's not a vibe check you want to fail.

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🌈 SEE ALSO 🌈

• Kernel file ./include/linux/generic-radix-tree.h — Generic radix trees/sparse arrays(9) 👑
• genradix_init(9)
• genradix_free(9)
• genradix_ptr(9)
• genradix_ptr_alloc(9)
• genradix_iter_init(9)
• genradix_iter_peek(9)
• genradix_for_each(9)
• genradix_for_each_reverse(9)
• genradix_prealloc(9)

the whole friend group fr fr 🫶 go read them, they ate 🔥

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mwah 💋 this page lives in ./include/linux, stamped October 2026, and yes — the header still says genradix_iter_peek_prev(9) because she's the main character 👑✨