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mirror-linux/kernel/trace
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David Carlier c2d2856cf6 tracing: Fix nr_subbufs initialization in simple_ring_buffer_init_mm() 
nr_subbufs in the ring buffer metadata is always initialized to zero
because it is assigned from cpu_buffer->nr_pages before the page
initialization loop has run. While nr_subbufs is not currently read
by the kernel, it should reflect the actual buffer geometry in the
meta page for correctness.

Move the assignment after the page loop so that cpu_buffer->nr_pages
holds the final count.

Link: https://patch.msgid.link/20260512135420.99194-1-devnexen@gmail.com
Fixes: 34e5b958bd ("tracing: Introduce simple_ring_buffer")
Reviewed-by: Vincent Donnefort <vdonnefort@google.com>
Assisted-by: Claude:claude-opus-4-7
Signed-off-by: David Carlier <devnexen@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
 		2026-05-21 08:24:59 -04:00
..
rv rv: Allow epoll in rtapp-sleep monitor 2026-04-01 15:18:30 +02:00
Kconfig tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
Makefile ring-buffer remote: Avoid unexpected symbol warnings (arm, s390) 2026-05-15 14:59:30 -04:00
blktrace.c block-7.0-20260305 2026-03-06 08:36:18 -08:00
bpf_trace.c fprobe: Fix unregister_fprobe() to wait for RCU grace period 2026-05-11 19:04:46 +09:00
bpf_trace.h
…
error_report-traces.c
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fgraph.c fgraph: Do not call handlers direct when not using ftrace_ops 2026-02-19 15:21:22 -05:00
fprobe.c fprobe: Fix unregister_fprobe() to wait for RCU grace period 2026-05-11 19:04:46 +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
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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
…
preemptirq_delay_test.c
…
remote_test.c tracing: Fix desc in error path for the trace remote test module 2026-05-16 16:11:04 -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: Flush and stop persistent ring buffer on panic 2026-05-21 08:20:58 -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
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simple_ring_buffer.c tracing: Fix nr_subbufs initialization in simple_ring_buffer_init_mm() 2026-05-21 08:24:59 -04:00
synth_event_gen_test.c
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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
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trace_boot.c tracing: Make the backup instance non-reusable 2026-04-02 13:20:38 -04:00
trace_branch.c tracing: branch: Fix inverted check on stat tracer registration 2026-04-28 14:28:29 -04:00
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
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trace_clock.c
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trace_dynevent.c tracing: Report wrong dynamic event command 2025-11-10 19:26:14 -05:00
trace_dynevent.h
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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
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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
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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
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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
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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
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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/probes: Limit size of event probe to 3K 2026-04-29 16:07:38 -04:00
trace_probe.h tracing/probes: Limit size of event probe to 3K 2026-04-29 16:07:38 -04:00
trace_probe_kernel.h
…
trace_probe_tmpl.h
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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
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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
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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
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undefsyms_base.c tracing: Make undefsyms_base.c a first-class citizen 2026-04-22 11:24:41 -04:00