ftrace_run_stop_machine(9)

💅 ftrace_run_stop_machine — from the Kernel API Manual (section 9, bestie)

okay so real talk, this one's a tiny page but it's lowkey important, so let's get into it. We're in the kernel API manual, section 9, and the star of the show is ftrace_run_stop_machine. It's giving "small function, big responsibility" energy fr fr. 🎀

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✨ NAME ✨

ftrace_run_stop_machine — the "ok we're going back to the stop machine method" function. That's literally it. That's the whole vibe check. 💅

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🌸 SYNOPSIS 🌸

void ftrace_run_stop_machine (int command );

notice how it returns void? yeah, it doesn't hand anything back to you, it just does the thing. main character energy honestly. 👑

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🦋 ARGUMENTS 🦋

• command — the command that tells ftrace what to do. that's it, that's the whole parameter. you hand it a command, it knows what's up. iykyk 🫶

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💖 DESCRIPTION 💖

okay so picture this: an arch (that's architecture, not the thing you build bridges with, keep up bestie 😭) needs to fall back to the stop machine method. In that case — and only in that case — it can call this function. that's genuinely the whole description, no cap. it's a "hey, we're going back to the old way" button and it does exactly what it says on the tin. ✨

ngl there's not a ton of detail on this page, so don't go reading extra behaviour into it — the manpage says what it says and nothing more. 💀

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🔥 SEE ALSO 🔥

okay this is the part where the page goes absolutely feral with cross-references, so buckle up buttercup, because here is the whole entire list, no skips, no cuts, no "and others":

• 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)
• 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)

and where does all this live? in the kernel file ./kernel/trace/ftrace.c. 🧚

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💜 cute lil sign-off: this page comes from ./kernel/trace, dated October 2026, and it's the ftrace_run_stop_machine(9) page of the Kernel API Manual. slay, go read your ftrace source, and stay hydrated bestie 🍓🌈