setup_new_fdt_ppc64(9)

💅 setup_new_fdt_ppc64 — like, the whole vibe check

okay so welcome to the Kernel API Manual, bestie 🫶 this one's a little function called setup_new_fdt_ppc64, and honestly? it's giving "quiet helper that does important stuff." no cap.

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✨ NAME ✨

setup_new_fdt_ppc64 — updates the flattend device-tree of the kernel being loaded. (and yes, the manpage really does spell it "flattend" — not me, i would never 😭 we love a typo with main character energy 💀)

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🌸 SYNOPSIS 🌸

int setup_new_fdt_ppc64 (const struct kimage *image , void *fdt , struct
       crash_mem *rmem );

three args, one int, zero drama ✨

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🎀 ARGUMENTS 🎀

• image — the kexec image that's being loaded rn. that's the whole context, bestie 💖
• fdt — the Flattened device tree for the next kernel. like, the tree the next kernel is gonna wake up in 🌈
• rmem — the Reserved memory ranges. literally the memory ranges that are, y'know, reserved 👑

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🦋 DESCRIPTION 🦋

okay so here's the actual tea, and it's short but iconic:

returns 0 on success, and a negative errno on error. that's it. that's the whole description. slay, honestly 💅✨

lowkey important: negative errno means error, not "some number." don't be out here ignoring the minus sign 🙈

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🔥 SEE ALSO 🔥

the kernel file to go look at:

Kernel file ./arch/powerpc/kexec/file_load_64.c

and the friend group — go read these too, they're all kind of the same squad 🫶:

• check_realloc_usable_mem(9)
• add_usable_mem(9)
• kdump_setup_usable_lmb(9)
• add_usable_mem_property(9)
• update_usable_mem_fdt(9)
• load_backup_segment(9)
• load_elfcorehdr_segment(9)
• load_crashdump_segments_ppc64(9)
• setup_purgatory_ppc64(9)
• cpu_node_size(9)
• kexec_extra_fdt_size_ppc64(9)
• arch_kexec_kernel_image_probe(9)
• arch_kimage_file_post_load_cleanup(9)

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okay that's the whole page, go touch some powerpc code 🧚💜

💀 sign-off szn: this lil masterpiece lives in ./arch/powerpc/kexec, it's dated October 2026, and it's the setup_new_fdt_ppc64(9) page from the Kernel API Manual — mwah, bye bestie 🎀⭐