overlay_prev...erwrite_node(9)

💅 NAME 💅

overlay_prevent_phandle_overwrite_node — ok bestie, this is a helper function for overlay_prevent_phandle_overwrite, and that's literally the whole vibe. It's a supporting character function, the bestie of the main bestie, and it's here living in the Kernel API Manual. 🫶

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✨ SYNOPSIS ✨

int overlay_prevent_phandle_overwrite_node (void *fdt , int fdtnode ,
       void *fdto , int fdtonode );

Not me showing you the exact signature because precision is everything. 🎀

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🌸 ARGUMENTS 🌸

• fdt — the base Device tree blob. This is the home base, the main character blob, the one everything gets checked against. 😌
• fdtnode — a node in fdt that gets checked for an overwrite. Like, we're peeking at this node specifically to see if somebody's about to do something shady to it. 👀
• fdto — the Device tree overlay blob. The incoming one. The guest star. ✨
• fdtonode — the node in fdto that matches fdtnode. Yes, they're a matching pair, it's giving soulmate energy, no cap. 💖

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🔥 RETURN 🔥

• 0 on success — slay, it worked. 🎉
• Negative error code on failure — 😭 that's the sad path, bestie, handle it.

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🦋 SEE ALSO 🦋

Kernel file ./scripts/dtc/libfdt/fdt_overlay.c — that's where the magic lives, iykyk. 💅

And the whole friend group, fr fr:

• overlay_get_target_phandle(9)
• overlay_phandle_add_offset(9)
• overlay_adjust_node_phandles(9)
• overlay_adjust_local_phandles(9)
• overlay_update_local_node_references(9)
• overlay_update_local_references(9)
• overlay_fixup_one_phandle(9)
• overlay_fixup_phandle(9)
• overlay_fixup_phandles(9)
• overlay_adjust_local_conflicting_phandle(9)
• overlay_update_node_conflicting_references(9)
• overlay_update_local_conflicting_references(9)
• overlay_prevent_phandle_overwrite(9)
• overlay_apply_node(9)
• overlay_merge(9)
• overlay_symbol_update(9)

That's the entire squad and they all ate. 👑🌈

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Heads up bestie: check fdtnode in fdt against the matching fdtonode in fdto, get 0 back for a win or a negative error code for a loss. That's the tea. ☕

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Sign-off time, icons only 🧚 — this page lives in ./scripts/dtc/libfdt, it's dated October 2026, and its title is overlay_prev...erwrite_node(9) because the title is long enough to need a little nap in the middle. 💀🌸 No notes, periodt. 💜