p4d_set_huge(9)

🎀 NAME 🎀

hey bestie, welcome to the Kernel API Manual 💖 this page is all about p4d_set_huge — aka “Set up kernel P4D mapping” ✨

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✨ SYNOPSIS ✨

ok so here’s the exact signature, no cap:

int p4d_set_huge (p4d_t *p4d , phys_addr_t addr , pgprot_t prot );

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💅 ARGUMENTS 💅

• p4d — Pointer to the P4D entry 🫶
• addr — Virtual address associated with the P4D entry 📍
• prot — Protection bits to use 🛡️

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🦋 DESCRIPTION 🦋

real talk, the whole description is literally this:

No 512GB pages yet -- always return 0

so yeah — no 512GB pages yet, and it always returns 0 💀✨

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🌈 SEE ALSO 🌈

catch these related icons in the kernel file ./arch/x86/mm/pgtable.c 👑:

• reserve_top_address(9)
• p4d_clear_huge(9)
• pud_set_huge(9)
• pmd_set_huge(9)
• pud_clear_huge(9)
• pmd_clear_huge(9)
• pmd_free_pte_page(9)

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mwah 💋 this iconic page comes from ./arch/x86/mm, dated October 2026, and it’s p4d_set_huge(9) — catch u later bestie 🫶🌸