kdump_setup_usable_lmb(9)

💖 kdump_setup_usable_lmb(9) — Kernel API Manual 🦋

okay so bestie, welcome to the kdump_setup_usable_lmb(9) page in the Kernel API Manual. This one is short, sweet, and lowkey iconic: it’s a callback situation, and the kernel comes knocking for every LMB. iykyk. 💅

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✨ NAME ✨

kdump_setup_usable_lmb — this is a callback function that gets called by walk_drmem_lmbs for every LMB to set its usable memory ranges. no cap, that’s the whole vibe. 🎀

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🌸 SYNOPSIS 🌸

int kdump_setup_usable_lmb (struct drmem_lmb *lmb , const __be32 **usm ,
       void *data );

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🫶 ARGUMENTS 🫶

• lmb — LMB info. literally the LMB details being handed over. 💖
• usm — linux,drconf-usable-memory property value. yes, that exact property name, bestie. 🦋
• data — Pointer to usable memory buffer and ranges info. it’s giving “here’s the buffer and the ranges, go off.” ✨

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💅 DESCRIPTION 💅

Returns 0 on success, negative errno on error. that’s it, that’s the whole description. short king behavior, fr fr. 👑

bestie note: this page is tiny, but the callback still matters — it gets called by walk_drmem_lmbs for every LMB to set its usable memory ranges. 🧚

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🌈 SEE ALSO 🌈

• Kernel file: ./arch/powerpc/kexec/file_load_64.c
• check_realloc_usable_mem(9)
• add_usable_mem(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)
• setup_new_fdt_ppc64(9)
• arch_kexec_kernel_image_probe(9)
• arch_kimage_file_post_load_cleanup(9)

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💖 cute lil sign-off from ./arch/powerpc/kexec, October 2026, for kdump_setup_usable_lmb(9) — mwah, bye bestie! 🫶✨