__is_kernel(9)

💅 __is_kernel — Kernel API Manual ✨

okay so bestie, welcome to __is_kernel(9), the little kernel-API manual page that's about to become your new hyperfixation 🎀

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🌸 NAME 🌸

__is_kernel — the function that checks if the pointer address is located in the kernel range 👑

✨ SYNOPSIS ✨

bool __is_kernel (unsigned long addr );

🦋 ARGUMENTS 🦋

• addr — the address to check, that's it, that's the whole vibe 💖

🌈 RETURN 🌈

true if the address is located in the kernel range, false otherwise. literally that simple, no cap 😌

🎀 NOTE 🎀

okay so this one's an internal helper — it checks the range of _stext to _end, and it also checks the range from __init_begin to __init_end, which can be outside of the _stext to _end range. the way that init section just does its own thing 💀 keep that in mind fr fr.

🔥 SEE ALSO 🔥

• Kernel file ./include/asm-generic/sections.h 🫶
• memory_contains(9)
• memory_intersects(9)
• init_section_contains(9)
• init_section_intersects(9)
• is_kernel_core_data(9)
• is_kernel_rodata(9)
• is_kernel_inittext(9)
• __is_kernel_text(9)

go read those too, they're all iconic in their own way ⭐

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bestie reminder: __is_kernel is a internal helper, so don't go treating it like a public main-character API, iykyk 🙈

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and that's the page!! sourced from ./include/asm-generic and dated October 2026 — so go forth, vibe check your pointers, and slay 💜🧚‍♀️🌷