mtrr_del(9)

💅 mtrr_del(9) 💅

okay so this is a page from the Kernel API Manual — yes bestie, we're in the kernel now, put your hair up 🎀

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✨ NAME ✨

mtrr_del — delete a memory type region 🗑️✨

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🦋 SYNOPSIS 🦋

int mtrr_del (int reg , unsigned long base , unsigned long size );

like, that's the whole vibe. three args, one int back. simple queen behavior 👑

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🌸 ARGUMENTS 🌸

• reg — the register that mtrr_add handed you back 🎀
• base — the physical base address, fr fr 📍
• size — how big the region is 📏

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💖 DESCRIPTION 💖

so here's the tea ☕: if you supply a register, then base and size are literally ignored. and ngl, that's exactly how drivers should call it — that's the main character way to do it 💅

this call releases an MTRR region 🫶 if the usage count drops all the way down to zero, the register gets freed and the region goes back to its default state — bye bye, back to factory settings ✨

on success, the register is returned 😌 on failure, you get a negative error code 😭 so like… check your return values, bestie. always.

no cap, this is the cleanup-and-glow-down function. treat it with respect 🧚

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🔥 SEE ALSO 🔥

• Kernel file ./arch/x86/kernel/cpu/mtrr/mtrr.c 📂
• mtrr_rendezvous_handler(9)
• set_mtrr(9)
• mtrr_add_page(9)
• mtrr_add(9)
• mtrr_del_page(9)
• arch_phys_wc_add(9)
• mtrr_bp_init(9)
• mtrr_save_state(9)

like a whole friend group of syscalls-adjacent kernel functions, iykyk 👯‍♀️

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and that's the page!! 💜 this one lives under ./arch/x86/kernel/cpu/mtrr and it's dated October 2026 — so like, mark your calendars bestie, mwah 🫶💖🌈