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mirror-linux/kernel/trace
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Masami Hiramatsu (Google) 476c5bbae6 tracing/fprobe: Fix to unregister ftrace_ops if it is empty on module unloading 
Fix fprobe to unregister ftrace_ops if corresponding type of fprobe
does not exist on the fprobe_ip_table and it is expected to be empty
when unloading modules.

Since ftrace thinks that the empty hash means everything to be traced,
if we set fprobes only on the unloaded module, all functions are traced
unexpectedly after unloading module.
e.g.

 # modprobe xt_LOG.ko
 # echo 'f:test log_tg*' > dynamic_events
 # echo 1 > events/fprobes/test/enable
 # cat enabled_functions
log_tg [xt_LOG] (1)             tramp: 0xffffffffa0004000 (fprobe_ftrace_entry+0x0/0x490) ->fprobe_ftrace_entry+0x0/0x490
log_tg_check [xt_LOG] (1)               tramp: 0xffffffffa0004000 (fprobe_ftrace_entry+0x0/0x490) ->fprobe_ftrace_entry+0x0/0x490
log_tg_destroy [xt_LOG] (1)             tramp: 0xffffffffa0004000 (fprobe_ftrace_entry+0x0/0x490) ->fprobe_ftrace_entry+0x0/0x490
 # rmmod xt_LOG
 # wc -l enabled_functions
34085 enabled_functions

Link: https://lore.kernel.org/all/177669368776.132053.10042301916765771279.stgit@mhiramat.tok.corp.google.com/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
 		2026-04-22 09:24:13 +09:00
..
rv rv: Allow epoll in rtapp-sleep monitor 2026-04-01 15:18:30 +02:00
.gitignore tracing: tell git to ignore the generated 'undefsyms_base.c' file 2026-04-20 17:25:56 -07:00
Kconfig tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
Makefile tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
blktrace.c block-7.0-20260305 2026-03-06 08:36:18 -08:00
bpf_trace.c bpf: Reject sleepable kprobe_multi programs at attach time 2026-04-02 09:48:46 -07:00
bpf_trace.h
…
error_report-traces.c
…
fgraph.c fgraph: Do not call handlers direct when not using ftrace_ops 2026-02-19 15:21:22 -05:00
fprobe.c tracing/fprobe: Fix to unregister ftrace_ops if it is empty on module unloading 2026-04-22 09:24:13 +09:00
ftrace.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
ftrace_internal.h
…
kprobe_event_gen_test.c
…
pid_list.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pid_list.h trace/pid_list: optimize pid_list->lock contention 2025-11-13 15:15:54 -05:00
power-traces.c PM: cpufreq: powernv/tracing: Move powernv_throttle trace event 2025-07-21 16:40:56 -04:00
preemptirq_delay_test.c kernel: trace: preemptirq_delay_test: use offstack cpu mask 2025-07-08 18:17:38 -04:00
remote_test.c tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
remote_test_events.h tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
rethook.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ring_buffer.c ring-buffer: Prevent off-by-one array access in ring_buffer_desc_page() 2026-04-14 05:13:09 -04:00
ring_buffer_benchmark.c tracing: Fix typo in ring_buffer_benchmark.c 2025-12-05 15:43:40 -05:00
rpm-traces.c
…
simple_ring_buffer.c tracing: load/unload page callbacks for simple_ring_buffer 2026-03-09 12:33:55 -04:00
synth_event_gen_test.c
…
trace.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace.h tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_benchmark.c
…
trace_benchmark.h
…
trace_boot.c tracing: Make the backup instance non-reusable 2026-04-02 13:20:38 -04:00
trace_branch.c
…
trace_btf.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_btf.h
…
trace_clock.c
…
trace_dynevent.c tracing: Report wrong dynamic event command 2025-11-10 19:26:14 -05:00
trace_dynevent.h
…
trace_entries.h tracing: Fix ftrace event field alignments 2026-02-05 09:47:11 -05:00
trace_eprobe.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_event_perf.c
…
trace_events.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_events_filter.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_events_filter_test.h
…
trace_events_hist.c tracing: Fix fully-qualified variable reference printing in histograms 2026-04-14 05:28:10 -04:00
trace_events_inject.c
…
trace_events_synth.c tracing: Use explicit array size instead of sentinel elements in symbol printing 2026-03-12 12:15:53 +01:00
trace_events_trigger.c tracing: Drain deferred trigger frees if kthread creation fails 2026-03-28 08:32:44 -04:00
trace_events_user.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_export.c tracing: Fix ftrace event field alignments 2026-02-05 09:47:11 -05:00
trace_fprobe.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_functions.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_functions_graph.c fgraph: Fix thresh_return nosleeptime double-adjust 2026-03-03 22:11:20 -05:00
trace_hwlat.c tracing: Fix false sharing in hwlat get_sample() 2026-02-10 03:36:39 -05:00
trace_irqsoff.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_kdb.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_kprobe.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
…
trace_mmiotrace.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_nop.c
…
trace_osnoise.c tracing latency updates for 7.1: 2026-04-17 10:12:11 -07:00
trace_output.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_output.h tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_pid.c tracing: Move pid filtering into trace_pid.c 2026-02-08 21:01:13 -05:00
trace_preemptirq.c
…
trace_printk.c tracing: move __printf() attribute on __ftrace_vbprintk() 2026-03-23 20:16:45 -04:00
trace_probe.c tracing/probe: reject non-closed empty immediate strings 2026-04-06 09:22:42 +09:00
trace_probe.h tracing: probes: Use __free() for trace_probe_log 2025-11-01 01:10:28 +09:00
trace_probe_kernel.h
…
trace_probe_tmpl.h
…
trace_recursion_record.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_remote.c tracing: Non-consuming read for trace remotes with an offline CPU 2026-04-02 14:16:09 +01:00
trace_sched_switch.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_sched_wakeup.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_selftest.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_selftest_dynamic.c
…
trace_seq.c tracing: Add bitmask-list option for human-readable bitmask display 2026-01-26 17:00:50 -05:00
trace_snapshot.c tracing: Remove duplicate latency_fsnotify() stub 2026-03-31 14:58:39 -04:00
trace_stack.c tracing updates for v6.16: 2025-05-29 21:04:36 -07:00
trace_stat.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_stat.h
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trace_synth.h
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trace_syscalls.c tracing: Use explicit array size instead of sentinel elements in symbol printing 2026-03-12 12:15:53 +01:00
trace_uprobe.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tracing_map.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tracing_map.h
…