pt_top_memsize_lg2(9)

okay bestie, welcome to the pt_top_memsize_lg2(9) page from the Kernel API Manual ✨ this one is short, but we’re giving it full main-character energy anyway 💅

💖 NAME 💖

pt_top_memsize_lg2 — and then a dash with absolutely nothing after it. That’s the name, no cap 🫶 (mysterious, lowkey iconic).

✨ SYNOPSIS ✨

unsigned int pt_top_memsize_lg2 (struct pt_common *common , uintptr_t top_of_table );

🎀 ARGUMENTS 🎀

• common — Table. That’s it, bestie — the whole description is literally “Table” 🧚
• top_of_table — Top of table value from _pt_top_set 🌸

🦋 DESCRIPTION 🦋

So this computes the allocation size of the top table — yes, the whole thing. For PT_FEAT_DYNAMIC_TOP, it will compute the top size assuming the table will grow. Growth mindset era, fr fr 🌱✨

🌸 SEE ALSO 🌸

Kernel file ./drivers/iommu/generic_pt/pt_iter.h — plus the whole friend group:

• pt_check_range(9)
• pt_index_to_va(9)
• pt_entry_fully_covered(9)
• pt_range_to_index(9)
• pt_range_to_end_index(9)
• pt_next_entry(9)
• for_each_pt_level_entry(9)
• pt_load_single_entry(9)
• pt_top_range(9)
• pt_all_range(9)
• pt_upper_range(9)
• pt_make_range(9)
• pt_init(9)
• pt_init_top(9)
• pt_descend(9)
• pt_walk_range(9)
• pt_range_slice(9)
• pt_compute_best_pgsize(9)
• PT_MAKE_LEVELS(9)

mwah 💋 — source/version: ./drivers/iommu/generic_pt; date: October 2026; page: pt_top_memsize_lg2(9) 🫶💖