--- /dev/null
+diff --git a/Kconfig b/Kconfig
+index acdab73..10eccff 100644
+--- a/Kconfig
++++ b/Kconfig
+@@ -2,7 +2,7 @@
+
+ config LTTNG
+ tristate "LTTng support"
+- select TRACEPOINTS
++ select TRACING
+ help
+ LTTng is an open source tracing framework for Linux.
+
+diff --git a/instrumentation/events/lttng-module/arch/x86/kvm/mmutrace.h b/instrumentation/events/lttng-module/arch/x86/kvm/mmutrace.h
+index 73463d5..e547040 100644
+--- a/instrumentation/events/lttng-module/arch/x86/kvm/mmutrace.h
++++ b/instrumentation/events/lttng-module/arch/x86/kvm/mmutrace.h
+@@ -220,6 +220,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(
+ LTTNG_KERNEL_RANGE(5,4,19, 5,5,0) || \
+ LTTNG_KERNEL_RANGE(5,5,3, 5,6,0) || \
+ LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,92, 4,16,0,0) || \
++ LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,44, 5,1,0,0) || \
+ LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,43, 5,3,18,45) || \
+ LTTNG_UBUNTU_KERNEL_RANGE(5,3,18,46, 5,4,0,0))
+ LTTNG_TRACEPOINT_EVENT_MAP(
+diff --git a/instrumentation/events/lttng-module/ext4.h b/instrumentation/events/lttng-module/ext4.h
+index 5f7ab28..b172c8d 100644
+--- a/instrumentation/events/lttng-module/ext4.h
++++ b/instrumentation/events/lttng-module/ext4.h
+@@ -460,6 +460,21 @@ LTTNG_TRACEPOINT_EVENT(ext4_mb_release_group_pa,
+ )
+ #endif
+
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0) || \
++ LTTNG_KERNEL_RANGE(5,8,6, 5,9,0))
++LTTNG_TRACEPOINT_EVENT(ext4_discard_preallocations,
++ TP_PROTO(struct inode *inode, unsigned int len, unsigned int needed),
++
++ TP_ARGS(inode, len, needed),
++
++ TP_FIELDS(
++ ctf_integer(dev_t, dev, inode->i_sb->s_dev)
++ ctf_integer(ino_t, ino, inode->i_ino)
++ ctf_integer(unsigned int, len, len)
++ ctf_integer(unsigned int, needed, needed)
++ )
++)
++#else
+ LTTNG_TRACEPOINT_EVENT(ext4_discard_preallocations,
+ TP_PROTO(struct inode *inode),
+
+@@ -470,6 +485,7 @@ LTTNG_TRACEPOINT_EVENT(ext4_discard_preallocations,
+ ctf_integer(ino_t, ino, inode->i_ino)
+ )
+ )
++#endif
+
+ LTTNG_TRACEPOINT_EVENT(ext4_mb_discard_preallocations,
+ TP_PROTO(struct super_block *sb, int needed),
+@@ -878,12 +894,26 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE(ext4__bitmap_load, ext4_mb_buddy_bitmap_load,
+ TP_ARGS(sb, group)
+ )
+
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0))
++LTTNG_TRACEPOINT_EVENT(ext4_read_block_bitmap_load,
++ TP_PROTO(struct super_block *sb, unsigned long group, bool prefetch),
++
++ TP_ARGS(sb, group, prefetch),
++
++ TP_FIELDS(
++ ctf_integer(dev_t, dev, sb->s_dev)
++ ctf_integer(__u32, group, group)
++ ctf_integer(bool, prefetch, prefetch)
++ )
++)
++#else
+ LTTNG_TRACEPOINT_EVENT_INSTANCE(ext4__bitmap_load, ext4_read_block_bitmap_load,
+
+ TP_PROTO(struct super_block *sb, unsigned long group),
+
+ TP_ARGS(sb, group)
+ )
++#endif
+
+ LTTNG_TRACEPOINT_EVENT_INSTANCE(ext4__bitmap_load, ext4_load_inode_bitmap,
+
+diff --git a/instrumentation/events/lttng-module/i2c.h b/instrumentation/events/lttng-module/i2c.h
+index dcbabf6..131d134 100644
+--- a/instrumentation/events/lttng-module/i2c.h
++++ b/instrumentation/events/lttng-module/i2c.h
+@@ -23,7 +23,7 @@ LTTNG_TRACEPOINT_EVENT_CODE(i2c_write,
+
+ TP_code_pre(
+ tp_locvar->extract_sensitive_payload =
+- READ_ONCE(extract_sensitive_payload);
++ LTTNG_READ_ONCE(extract_sensitive_payload);
+ ),
+
+ TP_FIELDS(
+@@ -78,7 +78,7 @@ LTTNG_TRACEPOINT_EVENT_CODE(i2c_reply,
+
+ TP_code_pre(
+ tp_locvar->extract_sensitive_payload =
+- READ_ONCE(extract_sensitive_payload);
++ LTTNG_READ_ONCE(extract_sensitive_payload);
+ ),
+
+ TP_FIELDS(
+diff --git a/instrumentation/events/lttng-module/rcu.h b/instrumentation/events/lttng-module/rcu.h
+index 6a0b58d..24bd51d 100644
+--- a/instrumentation/events/lttng-module/rcu.h
++++ b/instrumentation/events/lttng-module/rcu.h
+@@ -394,7 +394,8 @@ LTTNG_TRACEPOINT_EVENT(rcu_fqs,
+ */
+ #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) \
+ || LTTNG_KERNEL_RANGE(5,5,6, 5,6,0) \
+- || LTTNG_KERNEL_RANGE(5,4,22, 5,5,0)
++ || LTTNG_KERNEL_RANGE(5,4,22, 5,5,0) \
++ || LTTNG_UBUNTU_KERNEL_RANGE(5,0,21,46, 5,1,0,0)
+ LTTNG_TRACEPOINT_EVENT(rcu_dyntick,
+
+ TP_PROTO(const char *polarity, long oldnesting, long newnesting, int dynticks),
+diff --git a/instrumentation/events/lttng-module/writeback.h b/instrumentation/events/lttng-module/writeback.h
+index affb4eb..0ce4915 100644
+--- a/instrumentation/events/lttng-module/writeback.h
++++ b/instrumentation/events/lttng-module/writeback.h
+@@ -46,7 +46,21 @@ static inline struct backing_dev_info *lttng_inode_to_bdi(struct inode *inode)
+
+ #endif
+
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0))
++#define show_inode_state(state) \
++ __print_flags(state, "|", \
++ {I_DIRTY_SYNC, "I_DIRTY_SYNC"}, \
++ {I_DIRTY_DATASYNC, "I_DIRTY_DATASYNC"}, \
++ {I_DIRTY_PAGES, "I_DIRTY_PAGES"}, \
++ {I_NEW, "I_NEW"}, \
++ {I_WILL_FREE, "I_WILL_FREE"}, \
++ {I_FREEING, "I_FREEING"}, \
++ {I_CLEAR, "I_CLEAR"}, \
++ {I_SYNC, "I_SYNC"}, \
++ {I_DIRTY_TIME, "I_DIRTY_TIME"}, \
++ {I_REFERENCED, "I_REFERENCED"} \
++ )
++#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))
+ #define show_inode_state(state) \
+ __print_flags(state, "|", \
+ {I_DIRTY_SYNC, "I_DIRTY_SYNC"}, \
+@@ -370,34 +384,55 @@ LTTNG_TRACEPOINT_EVENT_WBC_INSTANCE(wbc_balance_dirty_wait, writeback_wbc_balanc
+ #endif
+ LTTNG_TRACEPOINT_EVENT_WBC_INSTANCE(wbc_writepage, writeback_wbc_writepage)
+
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0))
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0) || \
++ LTTNG_KERNEL_RANGE(5,8,6, 5,9,0) || \
++ LTTNG_KERNEL_RANGE(5,4,62, 5,5,0) || \
++ LTTNG_KERNEL_RANGE(4,19,143, 4,20,0) || \
++ LTTNG_KERNEL_RANGE(4,14,196, 4,15,0) || \
++ LTTNG_KERNEL_RANGE(4,9,235, 4,10,0) || \
++ LTTNG_KERNEL_RANGE(4,4,235, 4,5,0) || \
++ LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,119, 4,16,0,0))
++LTTNG_TRACEPOINT_EVENT(writeback_queue_io,
++ TP_PROTO(struct bdi_writeback *wb,
++ struct wb_writeback_work *work,
++ unsigned long dirtied_before,
++ int moved),
++ TP_ARGS(wb, work, dirtied_before, moved),
++ TP_FIELDS(
++ ctf_array_text(char, name, dev_name(wb->bdi->dev), 32)
++ ctf_integer(unsigned long, older, dirtied_before)
++ ctf_integer(int, moved, moved)
++ )
++)
++#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
+ LTTNG_TRACEPOINT_EVENT(writeback_queue_io,
+ TP_PROTO(struct bdi_writeback *wb,
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
+ struct wb_writeback_work *work,
+-#else
+- unsigned long *older_than_this,
+-#endif
+ int moved),
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
+ TP_ARGS(wb, work, moved),
+-#else
++ TP_FIELDS(
++ ctf_array_text(char, name, dev_name(wb->bdi->dev), 32)
++ ctf_integer(int, moved, moved)
++ )
++)
++#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0))
++LTTNG_TRACEPOINT_EVENT(writeback_queue_io,
++ TP_PROTO(struct bdi_writeback *wb,
++ unsigned long *older_than_this,
++ int moved),
+ TP_ARGS(wb, older_than_this, moved),
+-#endif
+ TP_FIELDS(
+ ctf_array_text(char, name, dev_name(wb->bdi->dev), 32)
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
+-#else
+ ctf_integer(unsigned long, older,
+ older_than_this ? *older_than_this : 0)
+ ctf_integer(long, age,
+ older_than_this ?
+ (jiffies - *older_than_this) * 1000 / HZ
+ : -1)
+-#endif
+ ctf_integer(int, moved, moved)
+ )
+ )
++#endif
+
+ #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,8,0))
+ LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
+@@ -446,7 +481,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
+ ctf_integer(unsigned long, dirty_limit, global_dirty_limit)
+ )
+ )
+-#else
++#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0))
+ LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
+
+ writeback_global_dirty_state,
+@@ -471,7 +506,6 @@ LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
+ )
+ )
+ #endif
+-#endif
+
+ #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
+
+diff --git a/lib/ringbuffer/backend.h b/lib/ringbuffer/backend.h
+index da937f2..43e1d47 100644
+--- a/lib/ringbuffer/backend.h
++++ b/lib/ringbuffer/backend.h
+@@ -156,7 +156,7 @@ size_t lib_ring_buffer_do_strcpy(const struct lib_ring_buffer_config *config,
+ * Only read source character once, in case it is
+ * modified concurrently.
+ */
+- c = READ_ONCE(src[count]);
++ c = LTTNG_READ_ONCE(src[count]);
+ if (!c)
+ break;
+ lib_ring_buffer_do_copy(config, &dest[count], &c, 1);
+diff --git a/lib/ringbuffer/backend_internal.h b/lib/ringbuffer/backend_internal.h
+index 2d6a345..1226fd8 100644
+--- a/lib/ringbuffer/backend_internal.h
++++ b/lib/ringbuffer/backend_internal.h
+@@ -367,7 +367,7 @@ void lib_ring_buffer_clear_noref(const struct lib_ring_buffer_config *config,
+ * Performing a volatile access to read the sb_pages, because we want to
+ * read a coherent version of the pointer and the associated noref flag.
+ */
+- id = READ_ONCE(bufb->buf_wsb[idx].id);
++ id = LTTNG_READ_ONCE(bufb->buf_wsb[idx].id);
+ for (;;) {
+ /* This check is called on the fast path for each record. */
+ if (likely(!subbuffer_id_is_noref(config, id))) {
+diff --git a/lib/ringbuffer/frontend.h b/lib/ringbuffer/frontend.h
+index 6f516d9..41382fe 100644
+--- a/lib/ringbuffer/frontend.h
++++ b/lib/ringbuffer/frontend.h
+@@ -79,7 +79,7 @@ void *channel_destroy(struct channel *chan);
+ #define for_each_channel_cpu(cpu, chan) \
+ for ((cpu) = -1; \
+ ({ (cpu) = cpumask_next(cpu, (chan)->backend.cpumask); \
+- smp_read_barrier_depends(); (cpu) < nr_cpu_ids; });)
++ smp_rmb(); (cpu) < nr_cpu_ids; });)
+
+ extern struct lib_ring_buffer *channel_get_ring_buffer(
+ const struct lib_ring_buffer_config *config,
+@@ -155,7 +155,7 @@ static inline
+ int lib_ring_buffer_is_finalized(const struct lib_ring_buffer_config *config,
+ struct lib_ring_buffer *buf)
+ {
+- int finalized = READ_ONCE(buf->finalized);
++ int finalized = LTTNG_READ_ONCE(buf->finalized);
+ /*
+ * Read finalized before counters.
+ */
+diff --git a/lib/ringbuffer/ring_buffer_frontend.c b/lib/ringbuffer/ring_buffer_frontend.c
+index 3cab365..4980d20 100644
+--- a/lib/ringbuffer/ring_buffer_frontend.c
++++ b/lib/ringbuffer/ring_buffer_frontend.c
+@@ -1074,7 +1074,7 @@ int lib_ring_buffer_snapshot(struct lib_ring_buffer *buf,
+ int finalized;
+
+ retry:
+- finalized = READ_ONCE(buf->finalized);
++ finalized = LTTNG_READ_ONCE(buf->finalized);
+ /*
+ * Read finalized before counters.
+ */
+@@ -1245,7 +1245,7 @@ int lib_ring_buffer_get_subbuf(struct lib_ring_buffer *buf,
+ return -EBUSY;
+ }
+ retry:
+- finalized = READ_ONCE(buf->finalized);
++ finalized = LTTNG_READ_ONCE(buf->finalized);
+ /*
+ * Read finalized before counters.
+ */
+diff --git a/lib/ringbuffer/ring_buffer_iterator.c b/lib/ringbuffer/ring_buffer_iterator.c
+index d25db72..7b4f20a 100644
+--- a/lib/ringbuffer/ring_buffer_iterator.c
++++ b/lib/ringbuffer/ring_buffer_iterator.c
+@@ -46,7 +46,7 @@ restart:
+ switch (iter->state) {
+ case ITER_GET_SUBBUF:
+ ret = lib_ring_buffer_get_next_subbuf(buf);
+- if (ret && !READ_ONCE(buf->finalized)
++ if (ret && !LTTNG_READ_ONCE(buf->finalized)
+ && config->alloc == RING_BUFFER_ALLOC_GLOBAL) {
+ /*
+ * Use "pull" scheme for global buffers. The reader
+diff --git a/lttng-abi.c b/lttng-abi.c
+index 64ea99d..b33879d 100644
+--- a/lttng-abi.c
++++ b/lttng-abi.c
+@@ -1264,6 +1264,46 @@ nomem:
+ return ret;
+ }
+
++static
++int lttng_abi_validate_event_param(struct lttng_kernel_event *event_param)
++{
++ /* Limit ABI to implemented features. */
++ switch (event_param->instrumentation) {
++ case LTTNG_KERNEL_SYSCALL:
++ switch (event_param->u.syscall.entryexit) {
++ case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
++ break;
++ default:
++ return -EINVAL;
++ }
++ switch (event_param->u.syscall.abi) {
++ case LTTNG_KERNEL_SYSCALL_ABI_ALL:
++ break;
++ default:
++ return -EINVAL;
++ }
++ switch (event_param->u.syscall.match) {
++ case LTTNG_SYSCALL_MATCH_NAME:
++ break;
++ default:
++ return -EINVAL;
++ }
++ break;
++
++ case LTTNG_KERNEL_TRACEPOINT: /* Fallthrough */
++ case LTTNG_KERNEL_KPROBE: /* Fallthrough */
++ case LTTNG_KERNEL_KRETPROBE: /* Fallthrough */
++ case LTTNG_KERNEL_NOOP: /* Fallthrough */
++ case LTTNG_KERNEL_UPROBE:
++ break;
++
++ case LTTNG_KERNEL_FUNCTION: /* Fallthrough */
++ default:
++ return -EINVAL;
++ }
++ return 0;
++}
++
+ static
+ int lttng_abi_create_event(struct file *channel_file,
+ struct lttng_kernel_event *event_param)
+@@ -1305,6 +1345,9 @@ int lttng_abi_create_event(struct file *channel_file,
+ ret = -EOVERFLOW;
+ goto refcount_error;
+ }
++ ret = lttng_abi_validate_event_param(event_param);
++ if (ret)
++ goto event_error;
+ if (event_param->instrumentation == LTTNG_KERNEL_TRACEPOINT
+ || event_param->instrumentation == LTTNG_KERNEL_SYSCALL) {
+ struct lttng_enabler *enabler;
+diff --git a/lttng-abi.h b/lttng-abi.h
+index 1d356ab..51d60e5 100644
+--- a/lttng-abi.h
++++ b/lttng-abi.h
+@@ -90,6 +90,31 @@ struct lttng_kernel_event_callsite {
+ } u;
+ } __attribute__((packed));
+
++enum lttng_kernel_syscall_entryexit {
++ LTTNG_KERNEL_SYSCALL_ENTRYEXIT = 0,
++ LTTNG_KERNEL_SYSCALL_ENTRY = 1, /* Not implemented. */
++ LTTNG_KERNEL_SYSCALL_EXIT = 2, /* Not implemented. */
++};
++
++enum lttng_kernel_syscall_abi {
++ LTTNG_KERNEL_SYSCALL_ABI_ALL = 0,
++ LTTNG_KERNEL_SYSCALL_ABI_NATIVE = 1, /* Not implemented. */
++ LTTNG_KERNEL_SYSCALL_ABI_COMPAT = 2, /* Not implemented. */
++};
++
++enum lttng_kernel_syscall_match {
++ LTTNG_SYSCALL_MATCH_NAME = 0,
++ LTTNG_SYSCALL_MATCH_NR = 1, /* Not implemented. */
++};
++
++struct lttng_kernel_syscall {
++ uint8_t entryexit; /* enum lttng_kernel_syscall_entryexit */
++ uint8_t abi; /* enum lttng_kernel_syscall_abi */
++ uint8_t match; /* enum lttng_kernel_syscall_match */
++ uint8_t padding;
++ uint32_t nr; /* For LTTNG_SYSCALL_MATCH_NR */
++} __attribute__((packed));
++
+ /*
+ * For syscall tracing, name = "*" means "enable all".
+ */
+@@ -106,6 +131,7 @@ struct lttng_kernel_event {
+ struct lttng_kernel_kprobe kprobe;
+ struct lttng_kernel_function_tracer ftrace;
+ struct lttng_kernel_uprobe uprobe;
++ struct lttng_kernel_syscall syscall;
+ char padding[LTTNG_KERNEL_EVENT_PADDING2];
+ } u;
+ } __attribute__((packed));
+diff --git a/lttng-events.c b/lttng-events.c
+index be7e389..4c0b04a 100644
+--- a/lttng-events.c
++++ b/lttng-events.c
+@@ -201,6 +201,10 @@ 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);
+@@ -740,6 +744,28 @@ 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;
+@@ -826,8 +852,7 @@ 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:
+@@ -870,8 +895,7 @@ int _lttng_event_unregister(struct lttng_event *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;
+@@ -1203,39 +1227,87 @@ 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
+@@ -1361,9 +1433,21 @@ 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);
+
+@@ -1719,7 +1803,7 @@ int lttng_metadata_printf(struct lttng_session *session,
+ size_t len;
+ va_list ap;
+
+- 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);
+@@ -2305,7 +2389,7 @@ 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;
+@@ -2377,7 +2461,7 @@ 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)
+@@ -2604,7 +2688,7 @@ 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);
+diff --git a/lttng-events.h b/lttng-events.h
+index a36a312..d4d9976 100644
+--- a/lttng-events.h
++++ b/lttng-events.h
+@@ -292,6 +292,16 @@ struct lttng_uprobe_handler {
+ struct list_head node;
+ };
+
++enum lttng_syscall_entryexit {
++ LTTNG_SYSCALL_ENTRY,
++ LTTNG_SYSCALL_EXIT,
++};
++
++enum lttng_syscall_abi {
++ LTTNG_SYSCALL_ABI_NATIVE,
++ LTTNG_SYSCALL_ABI_COMPAT,
++};
++
+ /*
+ * lttng_event structure is referred to by the tracing fast path. It must be
+ * kept small.
+@@ -318,6 +328,11 @@ struct lttng_event {
+ struct inode *inode;
+ struct list_head head;
+ } uprobe;
++ struct {
++ char *syscall_name;
++ enum lttng_syscall_entryexit entryexit;
++ enum lttng_syscall_abi abi;
++ } syscall;
+ } u;
+ struct list_head list; /* Event list in session */
+ unsigned int metadata_dumped:1;
+@@ -457,10 +472,10 @@ struct lttng_channel {
+ struct lttng_syscall_filter *sc_filter;
+ int header_type; /* 0: unset, 1: compact, 2: large */
+ enum channel_type channel_type;
++ int syscall_all;
+ unsigned int metadata_dumped:1,
+ sys_enter_registered:1,
+ sys_exit_registered:1,
+- syscall_all:1,
+ tstate:1; /* Transient enable state */
+ };
+
+@@ -653,10 +668,11 @@ void lttng_clock_unref(void);
+ #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
+ int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
+ int lttng_syscalls_unregister(struct lttng_channel *chan);
++int lttng_syscalls_destroy(struct lttng_channel *chan);
+ int lttng_syscall_filter_enable(struct lttng_channel *chan,
+- const char *name);
++ struct lttng_event *event);
+ int lttng_syscall_filter_disable(struct lttng_channel *chan,
+- const char *name);
++ struct lttng_event *event);
+ long lttng_channel_syscall_mask(struct lttng_channel *channel,
+ struct lttng_kernel_syscall_mask __user *usyscall_mask);
+ #else
+@@ -670,14 +686,19 @@ static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
+ return 0;
+ }
+
++static inline int lttng_syscalls_destroy(struct lttng_channel *chan)
++{
++ return 0;
++}
++
+ static inline int lttng_syscall_filter_enable(struct lttng_channel *chan,
+- const char *name)
++ struct lttng_event *event);
+ {
+ return -ENOSYS;
+ }
+
+ static inline int lttng_syscall_filter_disable(struct lttng_channel *chan,
+- const char *name)
++ struct lttng_event *event);
+ {
+ return -ENOSYS;
+ }
+diff --git a/lttng-syscalls.c b/lttng-syscalls.c
+index 97f1ba9..26cead6 100644
+--- a/lttng-syscalls.c
++++ b/lttng-syscalls.c
+@@ -367,8 +367,10 @@ const struct trace_syscall_entry compat_sc_exit_table[] = {
+ #undef CREATE_SYSCALL_TABLE
+
+ struct lttng_syscall_filter {
+- DECLARE_BITMAP(sc, NR_syscalls);
+- DECLARE_BITMAP(sc_compat, NR_compat_syscalls);
++ DECLARE_BITMAP(sc_entry, NR_syscalls);
++ DECLARE_BITMAP(sc_exit, NR_syscalls);
++ DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls);
++ DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls);
+ };
+
+ static void syscall_entry_unknown(struct lttng_event *event,
+@@ -391,29 +393,23 @@ void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
+ size_t table_len;
+
+ if (unlikely(in_compat_syscall())) {
+- struct lttng_syscall_filter *filter;
+-
+- filter = lttng_rcu_dereference(chan->sc_filter);
+- if (filter) {
+- if (id < 0 || id >= NR_compat_syscalls
+- || !test_bit(id, filter->sc_compat)) {
+- /* System call filtered out. */
+- return;
+- }
++ struct lttng_syscall_filter *filter = chan->sc_filter;
++
++ if (id < 0 || id >= NR_compat_syscalls
++ || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_entry))) {
++ /* System call filtered out. */
++ return;
+ }
+ table = compat_sc_table;
+ table_len = ARRAY_SIZE(compat_sc_table);
+ unknown_event = chan->sc_compat_unknown;
+ } else {
+- struct lttng_syscall_filter *filter;
+-
+- filter = lttng_rcu_dereference(chan->sc_filter);
+- if (filter) {
+- if (id < 0 || id >= NR_syscalls
+- || !test_bit(id, filter->sc)) {
+- /* System call filtered out. */
+- return;
+- }
++ struct lttng_syscall_filter *filter = chan->sc_filter;
++
++ if (id < 0 || id >= NR_syscalls
++ || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_entry))) {
++ /* System call filtered out. */
++ return;
+ }
+ table = sc_table;
+ table_len = ARRAY_SIZE(sc_table);
+@@ -545,29 +541,23 @@ void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
+
+ id = syscall_get_nr(current, regs);
+ if (unlikely(in_compat_syscall())) {
+- struct lttng_syscall_filter *filter;
+-
+- filter = lttng_rcu_dereference(chan->sc_filter);
+- if (filter) {
+- if (id < 0 || id >= NR_compat_syscalls
+- || !test_bit(id, filter->sc_compat)) {
+- /* System call filtered out. */
+- return;
+- }
++ struct lttng_syscall_filter *filter = chan->sc_filter;
++
++ if (id < 0 || id >= NR_compat_syscalls
++ || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_exit))) {
++ /* System call filtered out. */
++ return;
+ }
+ table = compat_sc_exit_table;
+ table_len = ARRAY_SIZE(compat_sc_exit_table);
+ unknown_event = chan->compat_sc_exit_unknown;
+ } else {
+- struct lttng_syscall_filter *filter;
+-
+- filter = lttng_rcu_dereference(chan->sc_filter);
+- if (filter) {
+- if (id < 0 || id >= NR_syscalls
+- || !test_bit(id, filter->sc)) {
+- /* System call filtered out. */
+- return;
+- }
++ struct lttng_syscall_filter *filter = chan->sc_filter;
++
++ if (id < 0 || id >= NR_syscalls
++ || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_exit))) {
++ /* System call filtered out. */
++ return;
+ }
+ table = sc_exit_table;
+ table_len = ARRAY_SIZE(sc_exit_table);
+@@ -713,27 +703,23 @@ int fill_table(const struct trace_syscall_entry *table, size_t table_len,
+ memset(&ev, 0, sizeof(ev));
+ switch (type) {
+ case SC_TYPE_ENTRY:
+- strncpy(ev.name, SYSCALL_ENTRY_STR,
+- LTTNG_KERNEL_SYM_NAME_LEN);
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+- strncpy(ev.name, SYSCALL_EXIT_STR,
+- LTTNG_KERNEL_SYM_NAME_LEN);
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+- strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR,
+- LTTNG_KERNEL_SYM_NAME_LEN);
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+- strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR,
+- LTTNG_KERNEL_SYM_NAME_LEN);
+- break;
+- default:
+- BUG_ON(1);
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ }
+- strncat(ev.name, desc->name,
+- LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1);
++ strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_SYSCALL;
+ chan_table[i] = _lttng_event_create(chan, &ev, filter,
+@@ -803,6 +789,8 @@ int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
+ strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_SYSCALL;
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ chan->sc_unknown = _lttng_event_create(chan, &ev, filter,
+ desc,
+ ev.instrumentation);
+@@ -820,6 +808,8 @@ int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
+ strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_SYSCALL;
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter,
+ desc,
+ ev.instrumentation);
+@@ -837,6 +827,8 @@ int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
+ strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_SYSCALL;
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev,
+ filter, desc,
+ ev.instrumentation);
+@@ -854,6 +846,8 @@ int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
+ strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_SYSCALL;
++ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
++ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter,
+ desc, ev.instrumentation);
+ WARN_ON_ONCE(!chan->sc_exit_unknown);
+@@ -883,6 +877,14 @@ int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
+ if (ret)
+ return ret;
+ #endif
++
++ if (!chan->sc_filter) {
++ chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter),
++ GFP_KERNEL);
++ if (!chan->sc_filter)
++ return -ENOMEM;
++ }
++
+ if (!chan->sys_enter_registered) {
+ ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
+ (void *) syscall_entry_probe, chan);
+@@ -930,7 +932,11 @@ int lttng_syscalls_unregister(struct lttng_channel *chan)
+ return ret;
+ chan->sys_exit_registered = 0;
+ }
+- /* lttng_event destroy will be performed by lttng_session_destroy() */
++ return 0;
++}
++
++int lttng_syscalls_destroy(struct lttng_channel *chan)
++{
+ kfree(chan->sc_table);
+ kfree(chan->sc_exit_table);
+ #ifdef CONFIG_COMPAT
+@@ -993,136 +999,150 @@ uint32_t get_sc_tables_len(void)
+ return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table);
+ }
+
+-int lttng_syscall_filter_enable(struct lttng_channel *chan,
+- const char *name)
++static
++const char *get_syscall_name(struct lttng_event *event)
+ {
+- int syscall_nr, compat_syscall_nr, ret;
+- struct lttng_syscall_filter *filter;
++ size_t prefix_len = 0;
+
+- WARN_ON_ONCE(!chan->sc_table);
++ WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL);
+
+- if (!name) {
+- /* Enable all system calls by removing filter */
+- if (chan->sc_filter) {
+- filter = chan->sc_filter;
+- rcu_assign_pointer(chan->sc_filter, NULL);
+- synchronize_trace();
+- kfree(filter);
++ switch (event->u.syscall.entryexit) {
++ case LTTNG_SYSCALL_ENTRY:
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ prefix_len = strlen(SYSCALL_ENTRY_STR);
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR);
++ break;
+ }
+- chan->syscall_all = 1;
+- return 0;
+- }
+-
+- if (!chan->sc_filter) {
+- if (chan->syscall_all) {
+- /*
+- * All syscalls are already enabled.
+- */
+- return -EEXIST;
++ break;
++ case LTTNG_SYSCALL_EXIT:
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ prefix_len = strlen(SYSCALL_EXIT_STR);
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR);
++ break;
+ }
+- filter = kzalloc(sizeof(struct lttng_syscall_filter),
+- GFP_KERNEL);
+- if (!filter)
+- return -ENOMEM;
+- } else {
+- filter = chan->sc_filter;
++ break;
+ }
+- syscall_nr = get_syscall_nr(name);
+- compat_syscall_nr = get_compat_syscall_nr(name);
+- if (syscall_nr < 0 && compat_syscall_nr < 0) {
+- ret = -ENOENT;
+- goto error;
++ WARN_ON_ONCE(prefix_len == 0);
++ return event->desc->name + prefix_len;
++}
++
++int lttng_syscall_filter_enable(struct lttng_channel *chan,
++ struct lttng_event *event)
++{
++ struct lttng_syscall_filter *filter = chan->sc_filter;
++ const char *syscall_name;
++ unsigned long *bitmap;
++ int syscall_nr;
++
++ WARN_ON_ONCE(!chan->sc_table);
++
++ syscall_name = get_syscall_name(event);
++
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ syscall_nr = get_syscall_nr(syscall_name);
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ syscall_nr = get_compat_syscall_nr(syscall_name);
++ break;
++ default:
++ return -EINVAL;
+ }
+- if (syscall_nr >= 0) {
+- if (test_bit(syscall_nr, filter->sc)) {
+- ret = -EEXIST;
+- goto error;
++ if (syscall_nr < 0)
++ return -ENOENT;
++
++
++ switch (event->u.syscall.entryexit) {
++ case LTTNG_SYSCALL_ENTRY:
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ bitmap = filter->sc_entry;
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ bitmap = filter->sc_compat_entry;
++ break;
+ }
+- bitmap_set(filter->sc, syscall_nr, 1);
+- }
+- if (compat_syscall_nr >= 0) {
+- if (test_bit(compat_syscall_nr, filter->sc_compat)) {
+- ret = -EEXIST;
+- goto error;
++ break;
++ case LTTNG_SYSCALL_EXIT:
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ bitmap = filter->sc_exit;
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ bitmap = filter->sc_compat_exit;
++ break;
+ }
+- bitmap_set(filter->sc_compat, compat_syscall_nr, 1);
++ break;
++ default:
++ return -EINVAL;
+ }
+- if (!chan->sc_filter)
+- rcu_assign_pointer(chan->sc_filter, filter);
++ if (test_bit(syscall_nr, bitmap))
++ return -EEXIST;
++ bitmap_set(bitmap, syscall_nr, 1);
+ return 0;
+-
+-error:
+- if (!chan->sc_filter)
+- kfree(filter);
+- return ret;
+ }
+
+ int lttng_syscall_filter_disable(struct lttng_channel *chan,
+- const char *name)
++ struct lttng_event *event)
+ {
+- int syscall_nr, compat_syscall_nr, ret;
+- struct lttng_syscall_filter *filter;
++ struct lttng_syscall_filter *filter = chan->sc_filter;
++ const char *syscall_name;
++ unsigned long *bitmap;
++ int syscall_nr;
+
+ WARN_ON_ONCE(!chan->sc_table);
+
+- if (!chan->sc_filter) {
+- if (!chan->syscall_all)
+- return -EEXIST;
+- filter = kzalloc(sizeof(struct lttng_syscall_filter),
+- GFP_KERNEL);
+- if (!filter)
+- return -ENOMEM;
+- /* Trace all system calls, then apply disable. */
+- bitmap_set(filter->sc, 0, NR_syscalls);
+- bitmap_set(filter->sc_compat, 0, NR_compat_syscalls);
+- } else {
+- filter = chan->sc_filter;
++ syscall_name = get_syscall_name(event);
++
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ syscall_nr = get_syscall_nr(syscall_name);
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ syscall_nr = get_compat_syscall_nr(syscall_name);
++ break;
++ default:
++ return -EINVAL;
+ }
++ if (syscall_nr < 0)
++ return -ENOENT;
+
+- if (!name) {
+- /* Fail if all syscalls are already disabled. */
+- if (bitmap_empty(filter->sc, NR_syscalls)
+- && bitmap_empty(filter->sc_compat,
+- NR_compat_syscalls)) {
+- ret = -EEXIST;
+- goto error;
+- }
+
+- /* Disable all system calls */
+- bitmap_clear(filter->sc, 0, NR_syscalls);
+- bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
+- goto apply_filter;
+- }
+- syscall_nr = get_syscall_nr(name);
+- compat_syscall_nr = get_compat_syscall_nr(name);
+- if (syscall_nr < 0 && compat_syscall_nr < 0) {
+- ret = -ENOENT;
+- goto error;
+- }
+- if (syscall_nr >= 0) {
+- if (!test_bit(syscall_nr, filter->sc)) {
+- ret = -EEXIST;
+- goto error;
++ switch (event->u.syscall.entryexit) {
++ case LTTNG_SYSCALL_ENTRY:
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ bitmap = filter->sc_entry;
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ bitmap = filter->sc_compat_entry;
++ break;
+ }
+- bitmap_clear(filter->sc, syscall_nr, 1);
+- }
+- if (compat_syscall_nr >= 0) {
+- if (!test_bit(compat_syscall_nr, filter->sc_compat)) {
+- ret = -EEXIST;
+- goto error;
++ break;
++ case LTTNG_SYSCALL_EXIT:
++ switch (event->u.syscall.abi) {
++ case LTTNG_SYSCALL_ABI_NATIVE:
++ bitmap = filter->sc_exit;
++ break;
++ case LTTNG_SYSCALL_ABI_COMPAT:
++ bitmap = filter->sc_compat_exit;
++ break;
+ }
+- bitmap_clear(filter->sc_compat, compat_syscall_nr, 1);
++ break;
++ default:
++ return -EINVAL;
+ }
+-apply_filter:
+- if (!chan->sc_filter)
+- rcu_assign_pointer(chan->sc_filter, filter);
+- chan->syscall_all = 0;
+- return 0;
++ if (!test_bit(syscall_nr, bitmap))
++ return -EEXIST;
++ bitmap_clear(bitmap, syscall_nr, 1);
+
+-error:
+- if (!chan->sc_filter)
+- kfree(filter);
+- return ret;
++ return 0;
+ }
+
+ static
+@@ -1236,6 +1256,9 @@ const struct file_operations lttng_syscall_list_fops = {
+ .release = seq_release,
+ };
+
++/*
++ * A syscall is enabled if it is traced for either entry or exit.
++ */
+ long lttng_channel_syscall_mask(struct lttng_channel *channel,
+ struct lttng_kernel_syscall_mask __user *usyscall_mask)
+ {
+@@ -1262,8 +1285,9 @@ long lttng_channel_syscall_mask(struct lttng_channel *channel,
+ char state;
+
+ if (channel->sc_table) {
+- if (filter)
+- state = test_bit(bit, filter->sc);
++ if (!READ_ONCE(channel->syscall_all) && filter)
++ state = test_bit(bit, filter->sc_entry)
++ || test_bit(bit, filter->sc_exit);
+ else
+ state = 1;
+ } else {
+@@ -1275,9 +1299,11 @@ long lttng_channel_syscall_mask(struct lttng_channel *channel,
+ char state;
+
+ if (channel->compat_sc_table) {
+- if (filter)
++ if (!READ_ONCE(channel->syscall_all) && filter)
+ state = test_bit(bit - ARRAY_SIZE(sc_table),
+- filter->sc_compat);
++ filter->sc_compat_entry)
++ || test_bit(bit - ARRAY_SIZE(sc_table),
++ filter->sc_compat_exit);
+ else
+ state = 1;
+ } else {
+diff --git a/probes/lttng-kprobes.c b/probes/lttng-kprobes.c
+index a44eaa1..38fb72e 100644
+--- a/probes/lttng-kprobes.c
++++ b/probes/lttng-kprobes.c
+@@ -31,11 +31,11 @@ int lttng_kprobes_handler_pre(struct kprobe *p, struct pt_regs *regs)
+ int ret;
+ unsigned long data = (unsigned long) p->addr;
+
+- if (unlikely(!READ_ONCE(chan->session->active)))
++ if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
+ return 0;
+- if (unlikely(!READ_ONCE(chan->enabled)))
++ if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
+ return 0;
+- if (unlikely(!READ_ONCE(event->enabled)))
++ if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
+ return 0;
+
+ lib_ring_buffer_ctx_init(&ctx, chan->chan, <tng_probe_ctx, sizeof(data),
+diff --git a/probes/lttng-kretprobes.c b/probes/lttng-kretprobes.c
+index ab98ff2..a6bcd21 100644
+--- a/probes/lttng-kretprobes.c
++++ b/probes/lttng-kretprobes.c
+@@ -51,11 +51,11 @@ int _lttng_kretprobes_handler(struct kretprobe_instance *krpi,
+ unsigned long parent_ip;
+ } payload;
+
+- if (unlikely(!READ_ONCE(chan->session->active)))
++ if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
+ return 0;
+- if (unlikely(!READ_ONCE(chan->enabled)))
++ if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
+ return 0;
+- if (unlikely(!READ_ONCE(event->enabled)))
++ if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
+ return 0;
+
+ payload.ip = (unsigned long) krpi->rp->kp.addr;
+diff --git a/probes/lttng-probe-kvm-x86-mmu.c b/probes/lttng-probe-kvm-x86-mmu.c
+index 37384a2..8f98186 100644
+--- a/probes/lttng-probe-kvm-x86-mmu.c
++++ b/probes/lttng-probe-kvm-x86-mmu.c
+@@ -24,7 +24,12 @@
+ */
+ #include <wrapper/tracepoint.h>
+
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,9,0))
++#include <../../arch/x86/kvm/mmu/mmu_internal.h>
++#include <../../arch/x86/kvm/mmu/mmutrace.h>
++#else
+ #include <../../arch/x86/kvm/mmutrace.h>
++#endif
+
+ #undef TRACE_INCLUDE_PATH
+ #undef TRACE_INCLUDE_FILE
+diff --git a/probes/lttng-tracepoint-event-impl.h b/probes/lttng-tracepoint-event-impl.h
+index 77b8638..72a669e 100644
+--- a/probes/lttng-tracepoint-event-impl.h
++++ b/probes/lttng-tracepoint-event-impl.h
+@@ -1132,11 +1132,11 @@ static void __event_probe__##_name(void *__data, _proto) \
+ \
+ if (!_TP_SESSION_CHECK(session, __session)) \
+ return; \
+- if (unlikely(!READ_ONCE(__session->active))) \
++ if (unlikely(!LTTNG_READ_ONCE(__session->active))) \
+ return; \
+- if (unlikely(!READ_ONCE(__chan->enabled))) \
++ if (unlikely(!LTTNG_READ_ONCE(__chan->enabled))) \
+ return; \
+- if (unlikely(!READ_ONCE(__event->enabled))) \
++ if (unlikely(!LTTNG_READ_ONCE(__event->enabled))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->pid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, current->tgid))) \
+@@ -1225,11 +1225,11 @@ static void __event_probe__##_name(void *__data) \
+ \
+ if (!_TP_SESSION_CHECK(session, __session)) \
+ return; \
+- if (unlikely(!READ_ONCE(__session->active))) \
++ if (unlikely(!LTTNG_READ_ONCE(__session->active))) \
+ return; \
+- if (unlikely(!READ_ONCE(__chan->enabled))) \
++ if (unlikely(!LTTNG_READ_ONCE(__chan->enabled))) \
+ return; \
+- if (unlikely(!READ_ONCE(__event->enabled))) \
++ if (unlikely(!LTTNG_READ_ONCE(__event->enabled))) \
+ return; \
+ __lf = lttng_rcu_dereference(__session->pid_tracker.p); \
+ if (__lf && likely(!lttng_id_tracker_lookup(__lf, current->tgid))) \
+diff --git a/probes/lttng-uprobes.c b/probes/lttng-uprobes.c
+index bc10128..bda1d9b 100644
+--- a/probes/lttng-uprobes.c
++++ b/probes/lttng-uprobes.c
+@@ -40,11 +40,11 @@ int lttng_uprobes_handler_pre(struct uprobe_consumer *uc, struct pt_regs *regs)
+ unsigned long ip;
+ } payload;
+
+- if (unlikely(!READ_ONCE(chan->session->active)))
++ if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
+ return 0;
+- if (unlikely(!READ_ONCE(chan->enabled)))
++ if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
+ return 0;
+- if (unlikely(!READ_ONCE(event->enabled)))
++ if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
+ return 0;
+
+ lib_ring_buffer_ctx_init(&ctx, chan->chan, <tng_probe_ctx,
+diff --git a/wrapper/compiler.h b/wrapper/compiler.h
+index 1496f33..b9f8c51 100644
+--- a/wrapper/compiler.h
++++ b/wrapper/compiler.h
+@@ -9,6 +9,7 @@
+ #define _LTTNG_WRAPPER_COMPILER_H
+
+ #include <linux/compiler.h>
++#include <linux/version.h>
+
+ /*
+ * Don't allow compiling with buggy compiler.
+@@ -39,4 +40,21 @@
+ # define WRITE_ONCE(x, val) ({ ACCESS_ONCE(x) = val; })
+ #endif
+
++/*
++ * In v4.15 a smp read barrier was added to READ_ONCE to replace
++ * lockless_dereference(), replicate this behavior on prior kernels
++ * and remove calls to smp_read_barrier_depends which was dropped
++ * in v5.9.
++ */
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,15,0))
++#define LTTNG_READ_ONCE(x) READ_ONCE(x)
++#else
++#define LTTNG_READ_ONCE(x) \
++({ \
++ typeof(x) __val = READ_ONCE(x); \
++ smp_read_barrier_depends(); \
++ __val; \
++})
++#endif
++
+ #endif /* _LTTNG_WRAPPER_COMPILER_H */
+diff --git a/wrapper/trace-clock.h b/wrapper/trace-clock.h
+index 9f4e366..187fc82 100644
+--- a/wrapper/trace-clock.h
++++ b/wrapper/trace-clock.h
+@@ -160,33 +160,30 @@ static inline void put_trace_clock(void)
+
+ static inline u64 trace_clock_read64(void)
+ {
+- struct lttng_trace_clock *ltc = READ_ONCE(lttng_trace_clock);
++ struct lttng_trace_clock *ltc = LTTNG_READ_ONCE(lttng_trace_clock);
+
+ if (likely(!ltc)) {
+ return trace_clock_read64_monotonic();
+ } else {
+- read_barrier_depends(); /* load ltc before content */
+ return ltc->read64();
+ }
+ }
+
+ static inline u64 trace_clock_freq(void)
+ {
+- struct lttng_trace_clock *ltc = READ_ONCE(lttng_trace_clock);
++ struct lttng_trace_clock *ltc = LTTNG_READ_ONCE(lttng_trace_clock);
+
+ if (!ltc) {
+ return trace_clock_freq_monotonic();
+ } else {
+- read_barrier_depends(); /* load ltc before content */
+ return ltc->freq();
+ }
+ }
+
+ static inline int trace_clock_uuid(char *uuid)
+ {
+- struct lttng_trace_clock *ltc = READ_ONCE(lttng_trace_clock);
++ struct lttng_trace_clock *ltc = LTTNG_READ_ONCE(lttng_trace_clock);
+
+- read_barrier_depends(); /* load ltc before content */
+ /* Use default UUID cb when NULL */
+ if (!ltc || !ltc->uuid) {
+ return trace_clock_uuid_monotonic(uuid);
+@@ -197,24 +194,22 @@ static inline int trace_clock_uuid(char *uuid)
+
+ static inline const char *trace_clock_name(void)
+ {
+- struct lttng_trace_clock *ltc = READ_ONCE(lttng_trace_clock);
++ struct lttng_trace_clock *ltc = LTTNG_READ_ONCE(lttng_trace_clock);
+
+ if (!ltc) {
+ return trace_clock_name_monotonic();
+ } else {
+- read_barrier_depends(); /* load ltc before content */
+ return ltc->name();
+ }
+ }
+
+ static inline const char *trace_clock_description(void)
+ {
+- struct lttng_trace_clock *ltc = READ_ONCE(lttng_trace_clock);
++ struct lttng_trace_clock *ltc = LTTNG_READ_ONCE(lttng_trace_clock);
+
+ if (!ltc) {
+ return trace_clock_description_monotonic();
+ } else {
+- read_barrier_depends(); /* load ltc before content */
+ return ltc->description();
+ }
+ }
projects / packages / lttng-modules.git / commitdiff