vunmap(9)

💅 vunmap(9)

okay so real talk, this is the page for vunmap from the Kernel API Manual — no cap, it's the breakup anthem for a mapping that vmap() set you up with 💔

✨ NAME ✨

vunmap — release a virtual mapping that you got from vmap() 🫶 like, it's the undoing. the "we're done here" of kernel virtual memory.

🎀 SYNOPSIS 🎀

void vunmap (const void *addr );

that's it. one argument. it returns void, so there's literally nothing to check, don't come for me 😭

🌸 ARGUMENTS 🌸

• addr — the memory base address, bestie. this is the starting address of the area you're about to hand back ✨

🦋 DESCRIPTION 🦋

So vunmap() frees the virtually contiguous memory area that starts at addr — and that area has to be one that was created from the page array you passed to vmap. not a cousin, not a lookalike, the actual one 💅

🚨 vibe check: this must NOT be called in interrupt context. like, at all. it's giving "sleepy function, do not disturb" 😴 — don't be the person who tries it in an interrupt, i'm begging 🙈

🌈 SEE ALSO 🌈

the whole fam lives in the kernel file ./mm/vmalloc.c 👑 and honestly? iconic lineup. go say hi:

• vunmap_range(9)
• 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)
• 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)

okay that's the whole page, ty for coming to my ted talk 🫶 this one's from the ./mm corner of the world, dated October 2026, and yes the header said vunmap(9) and the footer said vunmap(9) again because consistency is main character energy 💖✨ go free your mappings responsibly, ily 💜