vmemmap_remap_split(9)

💖 NAME 💖

okay so bestie, this is vmemmap_remap_split(9) from the Kernel API Manual, and it does exactly one iconic thing: it splits the vmemmap virtual address range [@start, @end) backing PMDs of the directmap into PTEs. that’s the whole vibe. no cap. ✨

🎀 SYNOPSIS 🎀

int vmemmap_remap_split (unsigned long start , unsigned long end );

🌸 ARGUMENTS 🌸

• start — the start address of the vmemmap virtual address range that we want to remap. it’s where the range begins, bestie. 🫶
• end — the end address of the vmemmap virtual address range that we want to remap. yes, it’s the other end. 💅

✨ RETURN ✨

• 0 on success — slay. ✅
• a negative error code otherwise — not slay, but that’s the deal. 😭

🦋 SEE ALSO 🦋

related lore lives in the Kernel file ./mm/hugetlb_vmemmap.c, plus these pages:

• struct vmemmap_remap_walk(9)
• vmemmap_remap_free(9)
• vmemmap_remap_alloc(9)
• hugetlb_vmemmap_restore_folio(9)
• hugetlb_vmemmap_restore_folios(9)
• hugetlb_vmemmap_optimize_folio(9)

that’s it, bestie — source/version ./mm, dated October 2026. go split those ranges. periodt. 💖🎀✨