vunmap_range(9)

💅 vunmap_range(9) — from the Kernel API Manual, bestie ✨

Okay so picture this: you're deep in the kernel, you've got a chunk of virtual address space, and you need it gone. Not "eh, maybe later" gone. Gone gone. That's literally what this page is about, and ngl it's kind of iconic. 🎀

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🌸 NAME 🌸

vunmap_range — unmaps kernel virtual addresses. That's it, that's the whole vibe. Bye-bye mappings. 🫶

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✨ SYNOPSIS ✨

void vunmap_range (unsigned long addr , unsigned long end );

Look at that signature. Clean. Minimal. Main character energy. 👑

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🦋 ARGUMENTS 🦋

• addr — where the VM area you're nuking starts. The beginning. The opener. 💖
• end — where that VM area stops — and heads up bestie, it's non-inclusive, so end itself is not part of the range. It's giving "exclusive party, you're not on the list" 🙈

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🔥 DESCRIPTION 🔥

So what does it actually do? It clears any present PTEs in that virtual address range, then flushes TLBs and caches. Boom. Clean slate. ✨

⚠️ But listen — and I need you to hear me on this one — if anything touches that address after this and before it's been re-mapped? That's a kernel bug. Not a "whoops lol" bug. A real one. Absolutely do not. 💀

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💜 SEE ALSO 💜

The whole friend group, fr fr — all of these live in the kernel file ./mm/vmalloc.c:

• vmap_pages_range(9)
• vm_area_map_pages(9)
• vm_area_unmap_pages(9)
• new_vmap_block(9)
• vm_unmap_aliases(9)
• vm_unmap_ram(9)
• vm_map_ram(9)
• vm_area_add_early(9)
• vm_area_register_early(9)
• get_vm_area(9)
• find_vm_area(9)
• remove_vm_area(9)
• vfree_atomic(9)
• vfree(9)
• vunmap(9)
• vmap(9)
• vmap_pfn(9)
• __vmalloc_node_range(9)
• __vmalloc_node(9)
• vmalloc(9)
• vmalloc_huge_node(9)
• vzalloc(9)
• vmalloc_user(9)
• vmalloc_node(9)
• vzalloc_node(9)
• vrealloc_node_align(9)
• vmalloc_32(9)
• vmalloc_32_user(9)
• vread_iter(9)
• remap_vmalloc_range_partial(9)
• remap_vmalloc_range(9)
• pvm_find_va_enclose_addr(9)
• pvm_determine_end_from_reverse(9)
• pcpu_get_vm_areas(9)
• pcpu_free_vm_areas(9)

Like, that's the whole squad. Go say hi. 🌈

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Okay that's the page!! 💅 This lil beauty came from ./mm, dated October 2026 — mwah, no notes, periodt. 🍓✨