pt_set_sw_bit_release(9)

💅 pt_set_sw_bit_release — a Kernel API Manual moment

okay so bestie, we're in the Kernel API Manual today and the star of the show is pt_set_sw_bit_release(9). it's giving "tiny function, big responsibilities" energy and honestly? iconic.

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✨ NAME ✨

pt_set_sw_bit_release — set a software bit in an item 🎀

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🌸 SYNOPSIS 🌸

void pt_set_sw_bit_release (struct pt_state *pts , unsigned int bitnr );

that's it. that's the whole signature. void return, no notes, no drama. 💅

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🦋 ARGUMENTS 🦋

• pts — the entry you're setting. this is your main character. 👑
• bitnr — the bit you're setting. which one? that one. the one you picked. ✨

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💖 DESCRIPTION 💖

okay so here's the tea 🍵 — software bits are ignored by HW and can be used for any purpose by the software. like, hardware literally does not see them, does not care, they're yours to vibe with however you want. lowkey the most freeing thing about them ngl.

and this function? it does a set bit and release operation. so: set the bit, then release. two-step. very demure, very mindful. 🧚

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🫶 SEE ALSO 🫶

kernel file: ./drivers/iommu/generic_pt/pt_common.h — go read it, it's right there, iykyk 📖

• pt_attr_from_entry(9)
• pt_can_have_leaf(9)
• pt_can_have_table(9)
• pt_clear_entries(9)
• pt_entry_make_write_dirty(9)
• pt_entry_make_write_clean(9)
• pt_entry_is_write_dirty(9)
• pt_dirty_supported(9)
• pt_entry_num_contig_lg2(9)
• pt_entry_oa(9)
• pt_entry_oa_lg2sz(9)
• pt_entry_oa_exact(9)
• pt_full_va_prefix(9)
• pt_has_system_page_size(9)
• pt_install_leaf_entry(9)
• pt_install_table(9)
• pt_item_oa(9)
• pt_load_entry_raw(9)
• pt_max_oa_lg2(9)
• pt_num_items_lg2(9)
• pt_pgsz_lg2_to_level(9)
• pt_possible_sizes(9)
• pt_table_item_lg2sz(9)
• pt_table_oa_lg2sz(9)
• pt_table_pa(9)
• pt_table_ptr(9)
• pt_max_sw_bit(9)
• pt_test_sw_bit_acquire(9)
• pt_load_entry(9)

like, that's a whole friend group right there and they all ate. 🔥

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🫶 and that's the page!! brought to you by ./drivers/iommu/generic_pt, dated October 2026, logged under pt_set_sw_bit_release(9) — periodt. 💜✨