ftrace_func_mapper_add_ip(9)

💅 ftrace_func_mapper_add_ip(9) 💅

okay so bestie, welcome to the Kernel API Manual, section 9 — this one lives in ./kernel/trace/ftrace.c and honestly it's giving "tiny function, big responsibilities" ✨

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🎀 NAME 🎀

ftrace_func_mapper_add_ip — map some data to an ip 🗺️💖

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✨ SYNOPSIS ✨

int ftrace_func_mapper_add_ip (struct ftrace_func_mapper *mapper ,
unsigned long ip , void *data );

like, three args, one int out, no drama 💅

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🌸 ARGUMENTS 🌸

• mapper — the mapper that has the ip maps 🗂️ she's the one holding all the mappings, keep her close
• ip — the instruction pointer address you're mapping data to 📍 literally the little address key
• data — the data to map to ip 🎁 whatever you're tying to that address, hand it over

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💖 RETURN 💖

0 on success, otherwise an error 😭 that's it, that's the whole vibe check — zero means slay, anything else means something went sideways

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🦋 SEE ALSO 🦋

Kernel file ./kernel/trace/ftrace.c — plus the whole friend group, no cap:

• 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_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)

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iykyk, but if you're adding to a mapper, go peep allocate_ftrace_func_mapper(9) first — she's the one who makes the mapper in the first place 🫶

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later bestie!! this page came from ./kernel/trace, dated October 2026, and it's part of the Kernel API Manual — go forth and map those ips 🌈⭐💜