radix_tree_exception(9)

💅 radix_tree_exception — the Kernel API Manual, bestie edition ✨

Okay so picture this: you're deep in kernel land, you just called radix_tree_deref_slot, and the pointer it handed you back is giving ✨suspicious✨. Is it a real, well-aligned pointer? Or is it one of the two flavor of exception? That's literally the whole plot of radix_tree_exception, and the Linux Kernel API Manual is here to walk you through it. 🎀

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🌸 NAME 🌸

radix_tree_exception — did radix_tree_deref_slot hand you back an exception or what? 👀

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🦋 SYNOPSIS 🦋

int radix_tree_exception (void *arg );

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💖 ARGUMENTS 💖

• arg — the value that radix_tree_deref_slot returned. That's it, that's the whole input. Just hand over whatever came back and let the function do its vibe check. 🫶

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⭐ RETURN ⭐

• 0 — you got a well-aligned pointer, everything's chill, main character energy, no notes. 💅
• non-0 — it's either kind of exception. Both of them. Either one. Not a well-aligned pointer, bestie. 😭

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🔥 SEE ALSO 🔥

Kernel file ./include/linux/radix-tree.h and its whole friend group, fr fr:

• struct radix_tree_iter(9)
• Radix-tree synchronization(9)
• radix_tree_deref_slot(9)
• radix_tree_deref_slot_protected(9)
• radix_tree_deref_retry(9)
• radix_tree_iter_init(9)
• radix_tree_next_chunk(9)
• radix_tree_iter_lookup(9)
• radix_tree_iter_retry(9)
• radix_tree_iter_resume(9)
• radix_tree_chunk_size(9)
• radix_tree_next_slot(9)
• radix_tree_for_each_slot(9)
• radix_tree_for_each_tagged(9)

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And that's the whole page, babes — short and iconic, just like it should be. This one lives in ./include/linux and the manual's stamped October 2026, so if you're reading it in the future, hiii, hope the kernel is slaying. 🌈💜