is_kernel_percpu_address(9)

🌸 is_kernel_percpu_address(9) — Kernel API Manual 🌸

okay so bestie, welcome to the Kernel API Manual page for is_kernel_percpu_address(9) — she’s a little bool-returning icon and we’re gonna get into it. 💖

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💖 NAME 💖

is_kernel_percpu_address — test whether an address is from the static percpu area. periodt ✨

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🦋 SYNOPSIS 🦋

bool is_kernel_percpu_address (unsigned long addr );

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🎀 ARGUMENTS 🎀

• addr — the address you’re testing, bestie. That’s the one. 💅

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✨ DESCRIPTION ✨

okay so this function is basically a vibe check for an address. You hand it addr, and it tests whether addr belongs to the in-kernel static percpu area. No cap. 🫶

⚠️ important caveat, bestie: module static percpu areas are not considered. They’re literally not invited to this party. For those, use is_module_percpu_address instead. iykyk. 💀

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🌈 RETURN 🌈

It returns true if addr is from the in-kernel static percpu area, and false otherwise. No “maybe,” no situationship, just bool realness. 👑✨

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💜 SEE ALSO 💜

Kernel file ./mm/percpu.c, plus the whole friend group:

• pcpu_addr_in_chunk(9)
• pcpu_check_block_hint(9)
• pcpu_next_md_free_region(9)
• pcpu_next_fit_region(9)
• pcpu_mem_zalloc(9)
• pcpu_mem_free(9)
• pcpu_chunk_relocate(9)
• pcpu_block_update(9)
• pcpu_chunk_refresh_hint(9)
• pcpu_block_refresh_hint(9)
• pcpu_block_update_hint_alloc(9)
• pcpu_block_update_hint_free(9)
• pcpu_is_populated(9)
• pcpu_find_block_fit(9)
• pcpu_alloc_area(9)
• pcpu_free_area(9)
• pcpu_alloc_first_chunk(9)
• pcpu_chunk_populated(9)
• pcpu_chunk_depopulated(9)
• pcpu_chunk_addr_search(9)
• pcpu_alloc(9)
• pcpu_balance_free(9)
• pcpu_balance_populated(9)
• pcpu_reclaim_populated(9)
• pcpu_balance_workfn(9)
• free_percpu(9)
• per_cpu_ptr_to_phys(9)
• pcpu_alloc_alloc_info(9)
• pcpu_free_alloc_info(9)
• pcpu_dump_alloc_info(9)
• pcpu_setup_first_chunk(9)
• pcpu_build_alloc_info(9)
• pcpu_embed_first_chunk(9)
• pcpu_page_first_chunk(9)

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This cutie comes from the ./mm source tree, dated October 2026, and you just read the is_kernel_percpu_address(9) page from the Kernel API Manual. Mwah 💋✨