ftrace_lookup_ip(9)

💖 ftrace_lookup_ip(9) 💖

okay bestie, welcome to the Kernel API Manual page for ftrace_lookup_ip. this one is short and sweet — it’s giving “tiny helper, big main character energy” 🔥

✨ NAME ✨

ftrace_lookup_ip — test to see if an ip exists in an ftrace_hash 💅

🎀 SYNOPSIS 🎀

struct ftrace_func_entry * ftrace_lookup_ip (struct ftrace_hash *hash ,
unsigned long ip );

🦋 ARGUMENTS 🦋

• hash — the hash to look at 👀
• ip — the instruction pointer to test 🎯

🌸 DESCRIPTION 🌸

so the whole vibe is: search a given hash to see if a given instruction pointer (ip) exists in it. that’s it. no cap, that’s the entire little mission 🫶

⭐ RETURN ⭐

returns the entry that holds the ip if it’s found. NULL otherwise 💖

🌈 SEE ALSO 🌈

kernel file ./kernel/trace/ftrace.c, plus these absolute icons: 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), unregister_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) 💜

mwah 💖 — from the ./kernel/trace corner of the kernel, dated October 2026, and yeah it’s ftrace_lookup_ip(9) season 🌈✨