vmcore_alloc_buf(9)

🦋 vmcore_alloc_buf(9) 🦋

Kernel API Manual

okay so bestie, welcome to the vmcore_alloc_buf(9) page from the Kernel API Manual. it's giving “allocate buffer in vmalloc memory,” and honestly? iconic. 💅✨

🌸 NAME 🌸

vmcore_alloc_buf — allocate buffer in vmalloc memory

🎀 SYNOPSIS 🎀

char * vmcore_alloc_buf (size_t size );

💖 ARGUMENTS 💖

• size — size of buffer

✨ DESCRIPTION ✨

okay so here’s the vibe check, bestie. if CONFIG_MMU is defined, it uses vmalloc_user to allow users to mmap the buffer to user-space by means of remap_vmalloc_range. slay. 🫶

if CONFIG_MMU is not defined, it uses vzalloc, since mmap_vmcore is disabled and there’s no need to allow users to mmap the buffer. periodt. 💅

👑 SEE ALSO 👑

kernel file ./fs/proc/vmcore.c, plus these besties:

• update_note_header_size_elf64(9)
• get_note_number_and_size_elf64(9)
• copy_notes_elf64(9)
• update_note_header_size_elf32(9)
• get_note_number_and_size_elf32(9)
• copy_notes_elf32(9)
• vmcoredd_write_header(9)
• vmcoredd_update_program_headers(9)
• vmcoredd_update_size(9)
• vmcore_add_device_dump(9)

okay that’s the whole page, bestie! 🫶 this one is from the Kernel API Manual, source/version ./fs/proc, dated October 2026, and the page is vmcore_alloc_buf(9) — cute little sign-off moment, no cap. 💖🎀