unregister_ftrace_direct(9)

💅 unregister_ftrace_direct(9) ✨

okay so this is the Kernel API Manual page for unregister_ftrace_direct, and it’s literally about undoing a direct-call setup, bestie. no cap 🫶

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🎀 NAME 🎀

unregister_ftrace_direct — remove calls to the custom trampoline that register_ftrace_direct previously registered for the @ops object. that’s the whole vibe 💖

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🦋 SYNOPSIS 🦋

int unregister_ftrace_direct (struct ftrace_ops *ops , unsigned long
addr , bool free_filters );

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🌸 ARGUMENTS 🌸

• ops — the address of the struct ftrace_ops object. yes, that one 👑
• addr — the address of the direct function that the ops functions call. the main-character address fr fr 💅
• free_filters — set it to true to remove all filters for the ftrace_ops; set it to false otherwise. choose wisely 🎀

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🧚 DESCRIPTION 🧚

this is used to remove direct calls to addr from the nop locations of the functions registered in ops — the ones registered with the ftrace_set_filter_ip function. it’s giving cleanup era, and honestly? obsessed 🧹✨

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🔥 RETURN 🔥

• 0 — success, slay 💖
• -EINVAL — the ops object was not properly registered. not iconic, but important 😭

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🌈 SEE ALSO 🌈

Kernel file ./kernel/trace/ftrace.c: ftrace_lookup_ip(9), ftrace_free_filter(9), ftrace_hash_move(9), ftrace_location_range(9), ftrace_location(9), ftrace_text_reserved(9), ftrace_bug(9), ftrace_update_record(9), ftrace_test_record(9), ftrace_get_addr_new(9), ftrace_get_addr_curr(9), ftrace_rec_iter_start(9), ftrace_rec_iter_next(9), ftrace_rec_iter_record(9), ftrace_run_stop_machine(9), arch_ftrace_update_code(9), ftrace_startup_subops(9), ftrace_shutdown_subops(9), ftrace_regex_open(9), allocate_ftrace_func_mapper(9), ftrace_func_mapper_find_ip(9), ftrace_func_mapper_add_ip(9), ftrace_func_mapper_remove_ip(9), free_ftrace_func_mapper(9), register_ftrace_direct(9), modify_ftrace_direct_nolock(9), modify_ftrace_direct(9), hash_add(9), update_ftrace_direct_add(9), hash_sub(9), update_ftrace_direct_del(9), update_ftrace_direct_mod(9), ftrace_set_filter_ip(9), ftrace_set_filter_ips(9), ftrace_ops_set_global_filter(9), ftrace_set_filter(9), ftrace_set_notrace(9), ftrace_set_global_filter(9), ftrace_set_global_notrace(9), ftrace_ops_get_func(9), ftrace_kill(9), ftrace_is_dead(9), register_ftrace_function(9), unregister_ftrace_function(9), ftrace_lookup_symbols(9) — that’s the full guest list, no gatekeeping 💜

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source/version ./kernel/trace • date October 2026 • page unregister_ftrace_direct(9) — and that’s the whole page, mwah 💋🎀