X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lttng-events.c;h=9462877d558397c3d4224a41534a524b2ee6427f;hb=41b3bcd01669b811788a6a5111d4659c92692895;hp=1ccbffd67fe60a961de18cf6b4c58d7334d1c155;hpb=d1f652f8d4f6d1de8f6d32ae8711d6469c38892c;p=lttng-modules.git diff --git a/lttng-events.c b/lttng-events.c index 1ccbffd6..9462877d 100644 --- a/lttng-events.c +++ b/lttng-events.c @@ -27,10 +27,10 @@ #include #include #include -#include #include -#include /* for wrapper_vmalloc_sync_all() */ +#include +#include /* for wrapper_vmalloc_sync_mappings() */ #include #include #include @@ -41,8 +41,16 @@ #include #include #include +#include #include #include +#include + +#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,16,0)) +#include +#else +#include +#endif #define METADATA_CACHE_DEFAULT_SIZE 4096 @@ -76,21 +84,22 @@ int _lttng_field_statedump(struct lttng_session *session, void synchronize_trace(void) { -#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0)) +#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,1,0) || \ + LTTNG_RHEL_KERNEL_RANGE(4,18,0,193,0,0, 4,19,0,0,0,0)) synchronize_rcu(); #else synchronize_sched(); #endif -#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) +#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) #ifdef CONFIG_PREEMPT_RT_FULL synchronize_rcu(); #endif -#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ +#else /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ #ifdef CONFIG_PREEMPT_RT synchronize_rcu(); #endif -#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ +#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,4,0)) */ } void lttng_lock_sessions(void) @@ -129,7 +138,7 @@ struct lttng_session *lttng_session_create(void) goto err; INIT_LIST_HEAD(&session->chan); INIT_LIST_HEAD(&session->events); - uuid_le_gen(&session->uuid); + lttng_guid_gen(&session->uuid); metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache), GFP_KERNEL); @@ -200,6 +209,10 @@ void lttng_session_destroy(struct lttng_session *session) WARN_ON(ret); } synchronize_trace(); /* Wait for in-flight events to complete */ + list_for_each_entry(chan, &session->chan, list) { + ret = lttng_syscalls_destroy(chan); + WARN_ON(ret); + } list_for_each_entry_safe(enabler, tmpenabler, &session->enablers_head, node) lttng_enabler_destroy(enabler); @@ -209,8 +222,10 @@ void lttng_session_destroy(struct lttng_session *session) BUG_ON(chan->channel_type == METADATA_CHANNEL); _lttng_channel_destroy(chan); } + mutex_lock(&session->metadata_cache->lock); list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list) _lttng_metadata_channel_hangup(metadata_stream); + mutex_unlock(&session->metadata_cache->lock); lttng_id_tracker_destroy(&session->pid_tracker, false); lttng_id_tracker_destroy(&session->vpid_tracker, false); lttng_id_tracker_destroy(&session->uid_tracker, false); @@ -415,7 +430,6 @@ int lttng_event_enable(struct lttng_event *event) ret = -EINVAL; break; case LTTNG_KERNEL_KPROBE: - case LTTNG_KERNEL_FUNCTION: case LTTNG_KERNEL_UPROBE: case LTTNG_KERNEL_NOOP: WRITE_ONCE(event->enabled, 1); @@ -423,6 +437,8 @@ int lttng_event_enable(struct lttng_event *event) case LTTNG_KERNEL_KRETPROBE: ret = lttng_kretprobes_event_enable_state(event, 1); break; + case LTTNG_KERNEL_FUNCTION: + lttng_fallthrough; default: WARN_ON_ONCE(1); ret = -EINVAL; @@ -451,7 +467,6 @@ int lttng_event_disable(struct lttng_event *event) ret = -EINVAL; break; case LTTNG_KERNEL_KPROBE: - case LTTNG_KERNEL_FUNCTION: case LTTNG_KERNEL_UPROBE: case LTTNG_KERNEL_NOOP: WRITE_ONCE(event->enabled, 0); @@ -459,6 +474,8 @@ int lttng_event_disable(struct lttng_event *event) case LTTNG_KERNEL_KRETPROBE: ret = lttng_kretprobes_event_enable_state(event, 0); break; + case LTTNG_KERNEL_FUNCTION: + lttng_fallthrough; default: WARN_ON_ONCE(1); ret = -EINVAL; @@ -601,11 +618,12 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan, case LTTNG_KERNEL_KPROBE: case LTTNG_KERNEL_UPROBE: case LTTNG_KERNEL_KRETPROBE: - case LTTNG_KERNEL_FUNCTION: case LTTNG_KERNEL_NOOP: case LTTNG_KERNEL_SYSCALL: event_name = event_param->name; break; + case LTTNG_KERNEL_FUNCTION: + lttng_fallthrough; default: WARN_ON_ONCE(1); ret = -EINVAL; @@ -697,6 +715,8 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan, event_return->enabled = 0; event_return->registered = 1; event_return->instrumentation = itype; + INIT_LIST_HEAD(&event_return->bytecode_runtime_head); + INIT_LIST_HEAD(&event_return->enablers_ref_head); /* * Populate lttng_event structure before kretprobe registration. */ @@ -728,27 +748,6 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan, list_add(&event_return->list, &chan->session->events); break; } - case LTTNG_KERNEL_FUNCTION: - /* - * Needs to be explicitly enabled after creation, since - * we may want to apply filters. - */ - event->enabled = 0; - event->registered = 1; - /* - * Populate lttng_event structure before event - * registration. - */ - smp_wmb(); - ret = lttng_ftrace_register(event_name, - event_param->u.ftrace.symbol_name, - event); - if (ret) { - goto register_error; - } - ret = try_module_get(event->desc->owner); - WARN_ON_ONCE(!ret); - break; case LTTNG_KERNEL_NOOP: case LTTNG_KERNEL_SYSCALL: /* @@ -758,6 +757,28 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan, event->enabled = 0; event->registered = 0; event->desc = event_desc; + switch (event_param->u.syscall.entryexit) { + case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: + ret = -EINVAL; + goto register_error; + case LTTNG_KERNEL_SYSCALL_ENTRY: + event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY; + break; + case LTTNG_KERNEL_SYSCALL_EXIT: + event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT; + break; + } + switch (event_param->u.syscall.abi) { + case LTTNG_KERNEL_SYSCALL_ABI_ALL: + ret = -EINVAL; + goto register_error; + case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: + event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE; + break; + case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: + event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT; + break; + } if (!event->desc) { ret = -EINVAL; goto register_error; @@ -785,6 +806,8 @@ struct lttng_event *_lttng_event_create(struct lttng_channel *chan, ret = try_module_get(event->desc->owner); WARN_ON_ONCE(!ret); break; + case LTTNG_KERNEL_FUNCTION: + lttng_fallthrough; default: WARN_ON_ONCE(1); ret = -EINVAL; @@ -843,16 +866,16 @@ void register_event(struct lttng_event *event) event); break; case LTTNG_KERNEL_SYSCALL: - ret = lttng_syscall_filter_enable(event->chan, - desc->name); + ret = lttng_syscall_filter_enable(event->chan, event); break; case LTTNG_KERNEL_KPROBE: case LTTNG_KERNEL_UPROBE: case LTTNG_KERNEL_KRETPROBE: - case LTTNG_KERNEL_FUNCTION: case LTTNG_KERNEL_NOOP: ret = 0; break; + case LTTNG_KERNEL_FUNCTION: + lttng_fallthrough; default: WARN_ON_ONCE(1); } @@ -886,13 +909,8 @@ int _lttng_event_unregister(struct lttng_event *event) lttng_kretprobes_unregister(event); ret = 0; break; - case LTTNG_KERNEL_FUNCTION: - lttng_ftrace_unregister(event); - ret = 0; - break; case LTTNG_KERNEL_SYSCALL: - ret = lttng_syscall_filter_disable(event->chan, - desc->name); + ret = lttng_syscall_filter_disable(event->chan, event); break; case LTTNG_KERNEL_NOOP: ret = 0; @@ -901,6 +919,8 @@ int _lttng_event_unregister(struct lttng_event *event) lttng_uprobes_unregister(event); ret = 0; break; + case LTTNG_KERNEL_FUNCTION: + lttng_fallthrough; default: WARN_ON_ONCE(1); } @@ -915,6 +935,8 @@ int _lttng_event_unregister(struct lttng_event *event) static void _lttng_event_destroy(struct lttng_event *event) { + struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; + switch (event->instrumentation) { case LTTNG_KERNEL_TRACEPOINT: lttng_event_put(event->desc); @@ -927,10 +949,6 @@ void _lttng_event_destroy(struct lttng_event *event) module_put(event->desc->owner); lttng_kretprobes_destroy_private(event); break; - case LTTNG_KERNEL_FUNCTION: - module_put(event->desc->owner); - lttng_ftrace_destroy_private(event); - break; case LTTNG_KERNEL_NOOP: case LTTNG_KERNEL_SYSCALL: break; @@ -938,11 +956,18 @@ void _lttng_event_destroy(struct lttng_event *event) module_put(event->desc->owner); lttng_uprobes_destroy_private(event); break; + case LTTNG_KERNEL_FUNCTION: + lttng_fallthrough; default: WARN_ON_ONCE(1); } list_del(&event->list); lttng_destroy_context(event->ctx); + lttng_free_event_filter_runtime(event); + /* Free event enabler refs */ + list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, + &event->enablers_ref_head, node) + kfree(enabler_ref); kmem_cache_free(event_cache, event); } @@ -1226,39 +1251,87 @@ int lttng_desc_match_enabler(const struct lttng_event_desc *desc, struct lttng_enabler *enabler) { const char *desc_name, *enabler_name; + bool compat = false, entry = false; enabler_name = enabler->event_param.name; switch (enabler->event_param.instrumentation) { case LTTNG_KERNEL_TRACEPOINT: desc_name = desc->name; + switch (enabler->type) { + case LTTNG_ENABLER_STAR_GLOB: + return lttng_match_enabler_star_glob(desc_name, enabler_name); + case LTTNG_ENABLER_NAME: + return lttng_match_enabler_name(desc_name, enabler_name); + default: + return -EINVAL; + } break; case LTTNG_KERNEL_SYSCALL: desc_name = desc->name; - if (!strncmp(desc_name, "compat_", strlen("compat_"))) + if (!strncmp(desc_name, "compat_", strlen("compat_"))) { desc_name += strlen("compat_"); + compat = true; + } if (!strncmp(desc_name, "syscall_exit_", strlen("syscall_exit_"))) { desc_name += strlen("syscall_exit_"); } else if (!strncmp(desc_name, "syscall_entry_", strlen("syscall_entry_"))) { desc_name += strlen("syscall_entry_"); + entry = true; } else { WARN_ON_ONCE(1); return -EINVAL; } + switch (enabler->event_param.u.syscall.entryexit) { + case LTTNG_KERNEL_SYSCALL_ENTRYEXIT: + break; + case LTTNG_KERNEL_SYSCALL_ENTRY: + if (!entry) + return 0; + break; + case LTTNG_KERNEL_SYSCALL_EXIT: + if (entry) + return 0; + break; + default: + return -EINVAL; + } + switch (enabler->event_param.u.syscall.abi) { + case LTTNG_KERNEL_SYSCALL_ABI_ALL: + break; + case LTTNG_KERNEL_SYSCALL_ABI_NATIVE: + if (compat) + return 0; + break; + case LTTNG_KERNEL_SYSCALL_ABI_COMPAT: + if (!compat) + return 0; + break; + default: + return -EINVAL; + } + switch (enabler->event_param.u.syscall.match) { + case LTTNG_SYSCALL_MATCH_NAME: + switch (enabler->type) { + case LTTNG_ENABLER_STAR_GLOB: + return lttng_match_enabler_star_glob(desc_name, enabler_name); + case LTTNG_ENABLER_NAME: + return lttng_match_enabler_name(desc_name, enabler_name); + default: + return -EINVAL; + } + break; + case LTTNG_SYSCALL_MATCH_NR: + return -EINVAL; /* Not implemented. */ + default: + return -EINVAL; + } break; default: WARN_ON_ONCE(1); return -EINVAL; } - switch (enabler->type) { - case LTTNG_ENABLER_STAR_GLOB: - return lttng_match_enabler_star_glob(desc_name, enabler_name); - case LTTNG_ENABLER_NAME: - return lttng_match_enabler_name(desc_name, enabler_name); - default: - return -EINVAL; - } } static @@ -1384,9 +1457,21 @@ void lttng_create_event_if_missing(struct lttng_enabler *enabler) static int lttng_enabler_ref_events(struct lttng_enabler *enabler) { - struct lttng_session *session = enabler->chan->session; + struct lttng_channel *chan = enabler->chan; + struct lttng_session *session = chan->session; struct lttng_event *event; + if (enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL && + enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT && + enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL && + enabler->event_param.u.syscall.match == LTTNG_SYSCALL_MATCH_NAME && + !strcmp(enabler->event_param.name, "*")) { + if (enabler->enabled) + WRITE_ONCE(chan->syscall_all, 1); + else + WRITE_ONCE(chan->syscall_all, 0); + } + /* First ensure that probe events are created for this enabler. */ lttng_create_event_if_missing(enabler); @@ -1647,7 +1732,7 @@ void lttng_session_lazy_sync_enablers(struct lttng_session *session) * was written and a negative value on error. */ int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, - struct channel *chan) + struct channel *chan, bool *coherent) { struct lib_ring_buffer_ctx ctx; int ret = 0; @@ -1686,6 +1771,7 @@ int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, ret = stream->transport->ops.event_reserve(&ctx, 0); if (ret != 0) { printk(KERN_WARNING "LTTng: Metadata event reservation failed\n"); + stream->coherent = false; goto end; } stream->transport->ops.event_write(&ctx, @@ -1693,18 +1779,46 @@ int lttng_metadata_output_channel(struct lttng_metadata_stream *stream, reserve_len); stream->transport->ops.event_commit(&ctx); stream->metadata_in += reserve_len; + if (reserve_len < len) + stream->coherent = false; + else + stream->coherent = true; ret = reserve_len; end: + if (coherent) + *coherent = stream->coherent; mutex_unlock(&stream->metadata_cache->lock); return ret; } +static +void lttng_metadata_begin(struct lttng_session *session) +{ + if (atomic_inc_return(&session->metadata_cache->producing) == 1) + mutex_lock(&session->metadata_cache->lock); +} + +static +void lttng_metadata_end(struct lttng_session *session) +{ + WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); + if (atomic_dec_return(&session->metadata_cache->producing) == 0) { + struct lttng_metadata_stream *stream; + + list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) + wake_up_interruptible(&stream->read_wait); + mutex_unlock(&session->metadata_cache->lock); + } +} + /* * Write the metadata to the metadata cache. * Must be called with sessions_mutex held. * The metadata cache lock protects us from concurrent read access from * thread outputting metadata content to ring buffer. + * The content of the printf is printed as a single atomic metadata + * transaction. */ int lttng_metadata_printf(struct lttng_session *session, const char *fmt, ...) @@ -1712,9 +1826,8 @@ int lttng_metadata_printf(struct lttng_session *session, char *str; size_t len; va_list ap; - struct lttng_metadata_stream *stream; - WARN_ON_ONCE(!READ_ONCE(session->active)); + WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active)); va_start(ap, fmt); str = kvasprintf(GFP_KERNEL, fmt, ap); @@ -1723,7 +1836,7 @@ int lttng_metadata_printf(struct lttng_session *session, return -ENOMEM; len = strlen(str); - mutex_lock(&session->metadata_cache->lock); + WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing)); if (session->metadata_cache->metadata_written + len > session->metadata_cache->cache_alloc) { char *tmp_cache_realloc; @@ -1749,16 +1862,11 @@ int lttng_metadata_printf(struct lttng_session *session, session->metadata_cache->metadata_written, str, len); session->metadata_cache->metadata_written += len; - mutex_unlock(&session->metadata_cache->lock); kfree(str); - list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) - wake_up_interruptible(&stream->read_wait); - return 0; err: - mutex_unlock(&session->metadata_cache->lock); kfree(str); return -ENOMEM; } @@ -2295,6 +2403,8 @@ int _lttng_fields_metadata_statedump(struct lttng_session *session, /* * Must be called with sessions_mutex held. + * The entire event metadata is printed as a single atomic metadata + * transaction. */ static int _lttng_event_metadata_statedump(struct lttng_session *session, @@ -2303,11 +2413,13 @@ int _lttng_event_metadata_statedump(struct lttng_session *session, { int ret = 0; - if (event->metadata_dumped || !READ_ONCE(session->active)) + if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active)) return 0; if (chan->channel_type == METADATA_CHANNEL) return 0; + lttng_metadata_begin(session); + ret = lttng_metadata_printf(session, "event {\n" " name = \"%s\";\n" @@ -2357,12 +2469,15 @@ int _lttng_event_metadata_statedump(struct lttng_session *session, event->metadata_dumped = 1; end: + lttng_metadata_end(session); return ret; } /* * Must be called with sessions_mutex held. + * The entire channel metadata is printed as a single atomic metadata + * transaction. */ static int _lttng_channel_metadata_statedump(struct lttng_session *session, @@ -2370,12 +2485,14 @@ int _lttng_channel_metadata_statedump(struct lttng_session *session, { int ret = 0; - if (chan->metadata_dumped || !READ_ONCE(session->active)) + if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active)) return 0; if (chan->channel_type == METADATA_CHANNEL) return 0; + lttng_metadata_begin(session); + WARN_ON_ONCE(!chan->header_type); ret = lttng_metadata_printf(session, "stream {\n" @@ -2409,6 +2526,7 @@ int _lttng_channel_metadata_statedump(struct lttng_session *session, chan->metadata_dumped = 1; end: + lttng_metadata_end(session); return ret; } @@ -2483,6 +2601,9 @@ int _lttng_event_header_declare(struct lttng_session *session) * in future versions. * This function may return a negative offset. It may happen if the * system sets the REALTIME clock to 0 after boot. + * + * Use 64bit timespec on kernels that have it, this makes 32bit arch + * y2038 compliant. */ static int64_t measure_clock_offset(void) @@ -2490,13 +2611,21 @@ int64_t measure_clock_offset(void) uint64_t monotonic_avg, monotonic[2], realtime; uint64_t tcf = trace_clock_freq(); int64_t offset; - struct timespec rts = { 0, 0 }; unsigned long flags; +#ifdef LTTNG_KERNEL_HAS_TIMESPEC64 + struct timespec64 rts = { 0, 0 }; +#else + struct timespec rts = { 0, 0 }; +#endif /* Disable interrupts to increase correlation precision. */ local_irq_save(flags); monotonic[0] = trace_clock_read64(); +#ifdef LTTNG_KERNEL_HAS_TIMESPEC64 + ktime_get_real_ts64(&rts); +#else getnstimeofday(&rts); +#endif monotonic[1] = trace_clock_read64(); local_irq_restore(flags); @@ -2517,7 +2646,7 @@ int64_t measure_clock_offset(void) static int print_escaped_ctf_string(struct lttng_session *session, const char *string) { - int ret; + int ret = 0; size_t i; char cur; @@ -2534,7 +2663,7 @@ int print_escaped_ctf_string(struct lttng_session *session, const char *string) if (ret) goto error; /* We still print the current char */ - /* Fallthrough */ + lttng_fallthrough; default: ret = lttng_metadata_printf(session, "%c", cur); break; @@ -2583,8 +2712,11 @@ int _lttng_session_metadata_statedump(struct lttng_session *session) struct lttng_event *event; int ret = 0; - if (!READ_ONCE(session->active)) + if (!LTTNG_READ_ONCE(session->active)) return 0; + + lttng_metadata_begin(session); + if (session->metadata_dumped) goto skip_session; @@ -2757,6 +2889,7 @@ skip_session: } session->metadata_dumped = 1; end: + lttng_metadata_end(session); return ret; } @@ -2767,9 +2900,9 @@ end: * Registers a transport which can be used as output to extract the data out of * LTTng. The module calling this registration function must ensure that no * trap-inducing code will be executed by the transport functions. E.g. - * vmalloc_sync_all() must be called between a vmalloc and the moment the memory + * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory * is made visible to the transport function. This registration acts as a - * vmalloc_sync_all. Therefore, only if the module allocates virtual memory + * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory * after its registration must it synchronize the TLBs. */ void lttng_transport_register(struct lttng_transport *transport) @@ -2777,9 +2910,9 @@ void lttng_transport_register(struct lttng_transport *transport) /* * Make sure no page fault can be triggered by the module about to be * registered. We deal with this here so we don't have to call - * vmalloc_sync_all() in each module's init. + * vmalloc_sync_mappings() in each module's init. */ - wrapper_vmalloc_sync_all(); + wrapper_vmalloc_sync_mappings(); mutex_lock(&sessions_mutex); list_add_tail(&transport->node, <tng_transport_list); @@ -2799,7 +2932,7 @@ void lttng_transport_unregister(struct lttng_transport *transport) } EXPORT_SYMBOL_GPL(lttng_transport_unregister); -#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) +#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) enum cpuhp_state lttng_hp_prepare; enum cpuhp_state lttng_hp_online; @@ -2915,7 +3048,7 @@ static void __exit lttng_exit_cpu_hotplug(void) cpuhp_remove_multi_state(lttng_hp_prepare); } -#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ +#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ static int lttng_init_cpu_hotplug(void) { return 0; @@ -2923,7 +3056,7 @@ static int lttng_init_cpu_hotplug(void) static void lttng_exit_cpu_hotplug(void) { } -#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */ +#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,10,0)) */ static int __init lttng_events_init(void) @@ -2978,6 +3111,9 @@ static int __init lttng_events_init(void) #else ""); #endif +#ifdef CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM + printk(KERN_NOTICE "LTTng: Experimental bitwise enum enabled.\n"); +#endif /* CONFIG_LTTNG_EXPERIMENTAL_BITWISE_ENUM */ return 0; error_hotplug: