folio_unlock(9)

🦋 folio_unlock(9) 🦋

okay so bestie, welcome to folio_unlock(9) from the Kernel API Manual — it's giving “release the folio” energy, and honestly? iconic. 💅

---

🌸 NAME 🌸

folio_unlock — unlocks a locked folio. no cap, that’s the whole gig. ✨

---

🎀 SYNOPSIS 🎀

void folio_unlock (struct folio *folio );

---

💖 ARGUMENTS 💖

• folio — the folio. literally the folio, bestie. that’s the one. 🫶

---

🌈 DESCRIPTION 🌈

This unlocks the folio and wakes up any thread that’s sleeping on the page lock. so it’s not just “unlock and dip” — it’s also the little wake-up call for whoever was waiting. 😭💖

---

⭐ CONTEXT ⭐

Context check, bestie:

• May be called from interrupt context or process context. ✅
• May not be called from NMI context. 🚫

💀 NMI context is a no-go, periodt. don’t do it.

---

🔗 SEE ALSO 🔗

no because the see-also section is literally a group chat. we’ve got Kernel file ./mm/filemap.c plus this whole friend group:

• filemap_remove_folio(9)
• filemap_fdatawrite_range(9)
• filemap_flush_range(9)
• filemap_flush(9)
• filemap_range_has_page(9)
• filemap_fdatawait_range(9)
• filemap_fdatawait_range_keep_errors(9)
• file_fdatawait_range(9)
• filemap_fdatawait_keep_errors(9)
• filemap_write_and_wait_range(9)
• file_check_and_advance_wb_err(9)
• file_write_and_wait_range(9)
• replace_page_cache_folio(9)
• softleaf_entry_wait_on_locked(9)
• folio_put_wait_locked(9)
• folio_end_read(9)
• folio_end_private_2(9)
• folio_wait_private_2(9)
• folio_wait_private_2_killable(9)
• folio_end_writeback_no_dropbehind(9)
• folio_end_writeback(9)
• __folio_lock(9)
• page_cache_next_miss(9)
• page_cache_prev_miss(9)
• __filemap_get_folio_mpol(9)
• find_get_entries(9)
• find_lock_entries(9)
• filemap_get_folios(9)
• filemap_get_folios_contig(9)
• filemap_get_folios_tag(9)
• filemap_get_folios_dirty(9)
• filemap_read(9)
• generic_file_read_iter(9)
• filemap_splice_read(9)
• mapping_seek_hole_data(9)
• filemap_fault(9)
• read_cache_folio(9)
• mapping_read_folio_gfp(9)
• read_cache_page_gfp(9)
• __generic_file_write_iter(9)
• generic_file_write_iter(9)
• filemap_release_folio(9)
• filemap_invalidate_inode(9)
• filemap_cachestat(9)

---

mwah 💋 — source/version ./mm, date October 2026. bye bestie, go unlock that folio! 💜🎀