update_ftrace_direct_del(9)

💅 update_ftrace_direct_del(9) — the Kernel API Manual tea ☕✨

okay bestie, buckle up, we're in the Kernel API Manual today and this one is genuinely a little baddie 🎀

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✨ NAME ✨

update_ftrace_direct_del — updates @ops by removing its direct callers provided in @hash 🧚

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🌸 SYNOPSIS 🌸

int update_ftrace_direct_del (struct ftrace_ops *ops , struct ftrace_hash *hash );

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🦋 ARGUMENTS 🦋

• ops — the address of the struct ftrace_ops object 💖
• hash — the address of the struct ftrace_hash object 🌈

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🔥 DESCRIPTION 🔥

so what this one does is delete custom direct callers (that's ip -> addr, iykyk) over in ops, and it takes them from the ones you specified via hash. that's the whole vibe. 💅

after it does its thing, the ops will be either unregistered updated. yes that's exactly what the manual says, no I'm not gonna editorialize, that's the sentence, we're moving on 🫶

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⭐ RETURN ⭐

• zero on success — that's the slay ✨
• Non zero on error 😭 — which includes:
  • -EINVAL — the hash is empty
  • -EINVAL — the ops is not registered

not me getting the same -EINVAL for two completely different problems 💀 check both, bestie.

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👑 SEE ALSO 👑

Kernel file ./kernel/trace/ftrace.c and literally the entire friend group:

• 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)
• 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_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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bestie this page is brought to you by the source/version ./kernel/trace, dated October 2026 🗓️💜 go read it in ftrace.c, it ate, no cap 🍓

update_ftrace_direct_del(9) 🎀 periodt ✨