lttng-modules: Fix "LTTng: vmalloc_sync_all symbol lookup failed" warnings

Fix the following warnings introduced after backporting linux kernel commit [1]
to stable branches:
# lttng create session
...
[  483.242037] LTTng: vmalloc_sync_all symbol lookup failed.
[  483.257056] Page fault handler and NMI tracing might trigger faults.
...

These patches should be dropped when a new stable 12.0 release is available.

[1] https://github.com/torvalds/linux/commit/763802b53a427ed3cbd419dbba255c414fdd9e7c

Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

5 files changed, 1044 insertions, 0 deletions

diff --git a/meta/recipes-kernel/lttng/lttng-modules/0001-Update-for-kernel-5.7-use-vmalloc_sync_mappings-on-k.patch b/meta/recipes-kernel/lttng/lttng-modules/0001-Update-for-kernel-5.7-use-vmalloc_sync_mappings-on-k.patch
new file mode 100644
index 0000000000..58f4d29193
--- /dev/null
+++ b/meta/recipes-kernel/lttng/lttng-modules/0001-Update-for-kernel-5.7-use-vmalloc_sync_mappings-on-k.patch
@@ -0,0 +1,853 @@
+From a2cc0e06330e55eefe668f7d6370de6d3177a907 Mon Sep 17 00:00:00 2001
+From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Date: Tue, 5 May 2020 13:38:31 -0400
+Subject: [PATCH] Update for kernel 5.7: use vmalloc_sync_mappings on kernels
+ >= 5.7
+
+Upstream-Status: Backport [https://github.com/lttng/lttng-modules/commit/da0fcb1497ff2437407883647a8a0bba12bd0f91]
+
+Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
+---
+ lib/ringbuffer/ring_buffer_backend.c |  4 +--
+ lttng-abi.c                          |  4 +--
+ lttng-context-callstack.c            |  2 +-
+ lttng-context-cgroup-ns.c            |  2 +-
+ lttng-context-cpu-id.c               |  2 +-
+ lttng-context-egid.c                 |  2 +-
+ lttng-context-euid.c                 |  2 +-
+ lttng-context-gid.c                  |  2 +-
+ lttng-context-hostname.c             |  2 +-
+ lttng-context-interruptible.c        |  2 +-
+ lttng-context-ipc-ns.c               |  2 +-
+ lttng-context-migratable.c           |  2 +-
+ lttng-context-mnt-ns.c               |  2 +-
+ lttng-context-need-reschedule.c      |  2 +-
+ lttng-context-net-ns.c               |  2 +-
+ lttng-context-nice.c                 |  2 +-
+ lttng-context-perf-counters.c        |  2 +-
+ lttng-context-pid-ns.c               |  2 +-
+ lttng-context-pid.c                  |  2 +-
+ lttng-context-ppid.c                 |  2 +-
+ lttng-context-preemptible.c          |  2 +-
+ lttng-context-prio.c                 |  2 +-
+ lttng-context-procname.c             |  2 +-
+ lttng-context-sgid.c                 |  2 +-
+ lttng-context-suid.c                 |  2 +-
+ lttng-context-tid.c                  |  2 +-
+ lttng-context-uid.c                  |  2 +-
+ lttng-context-user-ns.c              |  2 +-
+ lttng-context-uts-ns.c               |  2 +-
+ lttng-context-vegid.c                |  2 +-
+ lttng-context-veuid.c                |  2 +-
+ lttng-context-vgid.c                 |  2 +-
+ lttng-context-vpid.c                 |  2 +-
+ lttng-context-vppid.c                |  2 +-
+ lttng-context-vsgid.c                |  2 +-
+ lttng-context-vsuid.c                |  2 +-
+ lttng-context-vtid.c                 |  2 +-
+ lttng-context-vuid.c                 |  2 +-
+ lttng-context.c                      |  2 +-
+ lttng-events.c                       | 10 +++---
+ lttng-ring-buffer-client.h           |  4 +--
+ lttng-ring-buffer-metadata-client.h  |  4 +--
+ lttng-syscalls.c                     |  2 +-
+ probes/lttng-kprobes.c               |  2 +-
+ probes/lttng-kretprobes.c            |  2 +-
+ probes/lttng-tracepoint-event-impl.h |  4 +--
+ probes/lttng-uprobes.c               |  2 +-
+ probes/lttng.c                       |  2 +-
+ tests/probes/lttng-test.c            |  2 +-
+ wrapper/vmalloc.h                    | 49 ++++++++++++++++++++++++++--
+ 50 files changed, 104 insertions(+), 61 deletions(-)
+
+diff --git a/lib/ringbuffer/ring_buffer_backend.c b/lib/ringbuffer/ring_buffer_backend.c
+index d4bec25..d232b7f 100644
+--- a/lib/ringbuffer/ring_buffer_backend.c
++++ b/lib/ringbuffer/ring_buffer_backend.c
+@@ -17,7 +17,7 @@
+ #include <linux/vmalloc.h>
+ 
+ #include <wrapper/mm.h>
+-#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_all() */
++#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
+ #include <wrapper/ringbuffer/config.h>
+ #include <wrapper/ringbuffer/backend.h>
+ #include <wrapper/ringbuffer/frontend.h>
+@@ -156,7 +156,7 @@ int lib_ring_buffer_backend_allocate(const struct lib_ring_buffer_config *config
+ 	 * If kmalloc ever uses vmalloc underneath, make sure the buffer pages
+ 	 * will not fault.
+ 	 */
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	wrapper_clear_current_oom_origin();
+ 	vfree(pages);
+ 	return 0;
+diff --git a/lttng-abi.c b/lttng-abi.c
+index b63e376..826ecab 100644
+--- a/lttng-abi.c
++++ b/lttng-abi.c
+@@ -30,7 +30,7 @@
+ #include <linux/uaccess.h>
+ #include <linux/slab.h>
+ #include <linux/err.h>
+-#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_all() */
++#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
+ #include <wrapper/ringbuffer/vfs.h>
+ #include <wrapper/ringbuffer/backend.h>
+ #include <wrapper/ringbuffer/frontend.h>
+@@ -1938,7 +1938,7 @@ int __init lttng_abi_init(void)
+ {
+ 	int ret = 0;
+ 
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	lttng_clock_ref();
+ 
+ 	ret = lttng_tp_mempool_init();
+diff --git a/lttng-context-callstack.c b/lttng-context-callstack.c
+index 195990a..ba35a39 100644
+--- a/lttng-context-callstack.c
++++ b/lttng-context-callstack.c
+@@ -141,7 +141,7 @@ int __lttng_add_callstack_generic(struct lttng_ctx **ctx,
+ 	field->record = lttng_callstack_record;
+ 	field->priv = fdata;
+ 	field->destroy = lttng_callstack_destroy;
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ 
+ error_create:
+diff --git a/lttng-context-cgroup-ns.c b/lttng-context-cgroup-ns.c
+index 81486e5..f324b7e 100644
+--- a/lttng-context-cgroup-ns.c
++++ b/lttng-context-cgroup-ns.c
+@@ -97,7 +97,7 @@ int lttng_add_cgroup_ns_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = cgroup_ns_record;
+ 	field->get_value = cgroup_ns_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_cgroup_ns_to_ctx);
+diff --git a/lttng-context-cpu-id.c b/lttng-context-cpu-id.c
+index 3778225..6e2f3f4 100644
+--- a/lttng-context-cpu-id.c
++++ b/lttng-context-cpu-id.c
+@@ -68,7 +68,7 @@ int lttng_add_cpu_id_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = cpu_id_record;
+ 	field->get_value = cpu_id_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_cpu_id_to_ctx);
+diff --git a/lttng-context-egid.c b/lttng-context-egid.c
+index 51536e2..bdcebb9 100644
+--- a/lttng-context-egid.c
++++ b/lttng-context-egid.c
+@@ -70,7 +70,7 @@ int lttng_add_egid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = egid_record;
+ 	field->get_value = egid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_egid_to_ctx);
+diff --git a/lttng-context-euid.c b/lttng-context-euid.c
+index 1bcd53f..c2b8dcd 100644
+--- a/lttng-context-euid.c
++++ b/lttng-context-euid.c
+@@ -70,7 +70,7 @@ int lttng_add_euid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = euid_record;
+ 	field->get_value = euid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_euid_to_ctx);
+diff --git a/lttng-context-gid.c b/lttng-context-gid.c
+index da54207..c355e8c 100644
+--- a/lttng-context-gid.c
++++ b/lttng-context-gid.c
+@@ -70,7 +70,7 @@ int lttng_add_gid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = gid_record;
+ 	field->get_value = gid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_gid_to_ctx);
+diff --git a/lttng-context-hostname.c b/lttng-context-hostname.c
+index e485aa9..17dbd57 100644
+--- a/lttng-context-hostname.c
++++ b/lttng-context-hostname.c
+@@ -101,7 +101,7 @@ int lttng_add_hostname_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = hostname_record;
+ 	field->get_value = hostname_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_hostname_to_ctx);
+diff --git a/lttng-context-interruptible.c b/lttng-context-interruptible.c
+index f3da199..8bd279a 100644
+--- a/lttng-context-interruptible.c
++++ b/lttng-context-interruptible.c
+@@ -75,7 +75,7 @@ int lttng_add_interruptible_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = interruptible_record;
+ 	field->get_value = interruptible_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_interruptible_to_ctx);
+diff --git a/lttng-context-ipc-ns.c b/lttng-context-ipc-ns.c
+index 78d5966..40b901b 100644
+--- a/lttng-context-ipc-ns.c
++++ b/lttng-context-ipc-ns.c
+@@ -96,7 +96,7 @@ int lttng_add_ipc_ns_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = ipc_ns_record;
+ 	field->get_value = ipc_ns_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_ipc_ns_to_ctx);
+diff --git a/lttng-context-migratable.c b/lttng-context-migratable.c
+index e3d8ede..65154b8 100644
+--- a/lttng-context-migratable.c
++++ b/lttng-context-migratable.c
+@@ -68,7 +68,7 @@ int lttng_add_migratable_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = migratable_record;
+ 	field->get_value = migratable_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_migratable_to_ctx);
+diff --git a/lttng-context-mnt-ns.c b/lttng-context-mnt-ns.c
+index b5bb955..cb59776 100644
+--- a/lttng-context-mnt-ns.c
++++ b/lttng-context-mnt-ns.c
+@@ -98,7 +98,7 @@ int lttng_add_mnt_ns_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = mnt_ns_record;
+ 	field->get_value = mnt_ns_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_mnt_ns_to_ctx);
+diff --git a/lttng-context-need-reschedule.c b/lttng-context-need-reschedule.c
+index f29fb28..94efaa5 100644
+--- a/lttng-context-need-reschedule.c
++++ b/lttng-context-need-reschedule.c
+@@ -68,7 +68,7 @@ int lttng_add_need_reschedule_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = need_reschedule_record;
+ 	field->get_value = need_reschedule_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_need_reschedule_to_ctx);
+diff --git a/lttng-context-net-ns.c b/lttng-context-net-ns.c
+index 6694037..37de09f 100644
+--- a/lttng-context-net-ns.c
++++ b/lttng-context-net-ns.c
+@@ -97,7 +97,7 @@ int lttng_add_net_ns_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = net_ns_record;
+ 	field->get_value = net_ns_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_net_ns_to_ctx);
+diff --git a/lttng-context-nice.c b/lttng-context-nice.c
+index 563e805..acaba85 100644
+--- a/lttng-context-nice.c
++++ b/lttng-context-nice.c
+@@ -68,7 +68,7 @@ int lttng_add_nice_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = nice_record;
+ 	field->get_value = nice_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_nice_to_ctx);
+diff --git a/lttng-context-perf-counters.c b/lttng-context-perf-counters.c
+index 43c4077..6b04d12 100644
+--- a/lttng-context-perf-counters.c
++++ b/lttng-context-perf-counters.c
+@@ -321,7 +321,7 @@ int lttng_add_perf_counter_to_ctx(uint32_t type,
+ 	field->u.perf_counter = perf_field;
+ 	lttng_context_update(*ctx);
+ 
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ 
+ #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
+diff --git a/lttng-context-pid-ns.c b/lttng-context-pid-ns.c
+index f039f26..ccf629d 100644
+--- a/lttng-context-pid-ns.c
++++ b/lttng-context-pid-ns.c
+@@ -98,7 +98,7 @@ int lttng_add_pid_ns_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = pid_ns_record;
+ 	field->get_value = pid_ns_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_pid_ns_to_ctx);
+diff --git a/lttng-context-pid.c b/lttng-context-pid.c
+index b3caabb..326eabe 100644
+--- a/lttng-context-pid.c
++++ b/lttng-context-pid.c
+@@ -68,7 +68,7 @@ int lttng_add_pid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = pid_record;
+ 	field->get_value = pid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_pid_to_ctx);
+diff --git a/lttng-context-ppid.c b/lttng-context-ppid.c
+index ef84ad1..ff25288 100644
+--- a/lttng-context-ppid.c
++++ b/lttng-context-ppid.c
+@@ -90,7 +90,7 @@ int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = ppid_record;
+ 	field->get_value = ppid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_ppid_to_ctx);
+diff --git a/lttng-context-preemptible.c b/lttng-context-preemptible.c
+index 328f2a4..867805b 100644
+--- a/lttng-context-preemptible.c
++++ b/lttng-context-preemptible.c
+@@ -86,7 +86,7 @@ int lttng_add_preemptible_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = preemptible_record;
+ 	field->get_value = preemptible_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_preemptible_to_ctx);
+diff --git a/lttng-context-prio.c b/lttng-context-prio.c
+index b5d21e7..367f7bd 100644
+--- a/lttng-context-prio.c
++++ b/lttng-context-prio.c
+@@ -89,7 +89,7 @@ int lttng_add_prio_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = prio_record;
+ 	field->get_value = prio_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_prio_to_ctx);
+diff --git a/lttng-context-procname.c b/lttng-context-procname.c
+index 54007d1..8f18ca2 100644
+--- a/lttng-context-procname.c
++++ b/lttng-context-procname.c
+@@ -72,7 +72,7 @@ int lttng_add_procname_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = procname_record;
+ 	field->get_value = procname_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_procname_to_ctx);
+diff --git a/lttng-context-sgid.c b/lttng-context-sgid.c
+index 61c8d53..2a58cbd 100644
+--- a/lttng-context-sgid.c
++++ b/lttng-context-sgid.c
+@@ -70,7 +70,7 @@ int lttng_add_sgid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = sgid_record;
+ 	field->get_value = sgid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_sgid_to_ctx);
+diff --git a/lttng-context-suid.c b/lttng-context-suid.c
+index 66d3ef5..ab3e2a9 100644
+--- a/lttng-context-suid.c
++++ b/lttng-context-suid.c
+@@ -70,7 +70,7 @@ int lttng_add_suid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = suid_record;
+ 	field->get_value = suid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_suid_to_ctx);
+diff --git a/lttng-context-tid.c b/lttng-context-tid.c
+index d2a20e6..f6defc4 100644
+--- a/lttng-context-tid.c
++++ b/lttng-context-tid.c
+@@ -71,7 +71,7 @@ int lttng_add_tid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = tid_record;
+ 	field->get_value = tid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_tid_to_ctx);
+diff --git a/lttng-context-uid.c b/lttng-context-uid.c
+index 5f11de2..5593852 100644
+--- a/lttng-context-uid.c
++++ b/lttng-context-uid.c
+@@ -70,7 +70,7 @@ int lttng_add_uid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = uid_record;
+ 	field->get_value = uid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_uid_to_ctx);
+diff --git a/lttng-context-user-ns.c b/lttng-context-user-ns.c
+index 746e4d9..0ed62e3 100644
+--- a/lttng-context-user-ns.c
++++ b/lttng-context-user-ns.c
+@@ -82,7 +82,7 @@ int lttng_add_user_ns_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = user_ns_record;
+ 	field->get_value = user_ns_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_user_ns_to_ctx);
+diff --git a/lttng-context-uts-ns.c b/lttng-context-uts-ns.c
+index 7352a3d..283bc73 100644
+--- a/lttng-context-uts-ns.c
++++ b/lttng-context-uts-ns.c
+@@ -96,7 +96,7 @@ int lttng_add_uts_ns_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = uts_ns_record;
+ 	field->get_value = uts_ns_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_uts_ns_to_ctx);
+diff --git a/lttng-context-vegid.c b/lttng-context-vegid.c
+index 604da2a..1431dac 100644
+--- a/lttng-context-vegid.c
++++ b/lttng-context-vegid.c
+@@ -70,7 +70,7 @@ int lttng_add_vegid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vegid_record;
+ 	field->get_value = vegid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vegid_to_ctx);
+diff --git a/lttng-context-veuid.c b/lttng-context-veuid.c
+index 983ae6a..a1b5b70 100644
+--- a/lttng-context-veuid.c
++++ b/lttng-context-veuid.c
+@@ -70,7 +70,7 @@ int lttng_add_veuid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = veuid_record;
+ 	field->get_value = veuid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_veuid_to_ctx);
+diff --git a/lttng-context-vgid.c b/lttng-context-vgid.c
+index e08c77d..0eed24e 100644
+--- a/lttng-context-vgid.c
++++ b/lttng-context-vgid.c
+@@ -70,7 +70,7 @@ int lttng_add_vgid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vgid_record;
+ 	field->get_value = vgid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vgid_to_ctx);
+diff --git a/lttng-context-vpid.c b/lttng-context-vpid.c
+index 982ce55..b5b6ce0 100644
+--- a/lttng-context-vpid.c
++++ b/lttng-context-vpid.c
+@@ -83,7 +83,7 @@ int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vpid_record;
+ 	field->get_value = vpid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vpid_to_ctx);
+diff --git a/lttng-context-vppid.c b/lttng-context-vppid.c
+index 66d6382..347ac63 100644
+--- a/lttng-context-vppid.c
++++ b/lttng-context-vppid.c
+@@ -112,7 +112,7 @@ int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vppid_record;
+ 	field->get_value = vppid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vppid_to_ctx);
+diff --git a/lttng-context-vsgid.c b/lttng-context-vsgid.c
+index aca5eda..3daf889 100644
+--- a/lttng-context-vsgid.c
++++ b/lttng-context-vsgid.c
+@@ -70,7 +70,7 @@ int lttng_add_vsgid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vsgid_record;
+ 	field->get_value = vsgid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vsgid_to_ctx);
+diff --git a/lttng-context-vsuid.c b/lttng-context-vsuid.c
+index 66c1300..d7fb0db 100644
+--- a/lttng-context-vsuid.c
++++ b/lttng-context-vsuid.c
+@@ -70,7 +70,7 @@ int lttng_add_vsuid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vsuid_record;
+ 	field->get_value = vsuid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vsuid_to_ctx);
+diff --git a/lttng-context-vtid.c b/lttng-context-vtid.c
+index 8fd68a8..e81ba0e 100644
+--- a/lttng-context-vtid.c
++++ b/lttng-context-vtid.c
+@@ -83,7 +83,7 @@ int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vtid_record;
+ 	field->get_value = vtid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vtid_to_ctx);
+diff --git a/lttng-context-vuid.c b/lttng-context-vuid.c
+index 6ae575f..33e22d3 100644
+--- a/lttng-context-vuid.c
++++ b/lttng-context-vuid.c
+@@ -70,7 +70,7 @@ int lttng_add_vuid_to_ctx(struct lttng_ctx **ctx)
+ 	field->record = vuid_record;
+ 	field->get_value = vuid_get_value;
+ 	lttng_context_update(*ctx);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return 0;
+ }
+ EXPORT_SYMBOL_GPL(lttng_add_vuid_to_ctx);
+diff --git a/lttng-context.c b/lttng-context.c
+index eb4534c..a6d4ee6 100644
+--- a/lttng-context.c
++++ b/lttng-context.c
+@@ -11,7 +11,7 @@
+ #include <linux/list.h>
+ #include <linux/mutex.h>
+ #include <linux/slab.h>
+-#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_all() */
++#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
+ #include <lttng-events.h>
+ #include <lttng-tracer.h>
+ 
+diff --git a/lttng-events.c b/lttng-events.c
+index a1c8445..401f646 100644
+--- a/lttng-events.c
++++ b/lttng-events.c
+@@ -30,7 +30,7 @@
+ #include <linux/uuid.h>
+ #include <linux/dmi.h>
+ 
+-#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_all() */
++#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
+ #include <wrapper/random.h>
+ #include <wrapper/tracepoint.h>
+ #include <wrapper/list.h>
+@@ -2753,9 +2753,9 @@ 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)
+@@ -2763,9 +2763,9 @@ 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, &lttng_transport_list);
+diff --git a/lttng-ring-buffer-client.h b/lttng-ring-buffer-client.h
+index d5c512c..ff62830 100644
+--- a/lttng-ring-buffer-client.h
++++ b/lttng-ring-buffer-client.h
+@@ -10,7 +10,7 @@
+ #include <linux/module.h>
+ #include <linux/types.h>
+ #include <lib/bitfield.h>
+-#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_all() */
++#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
+ #include <wrapper/trace-clock.h>
+ #include <lttng-events.h>
+ #include <lttng-tracer.h>
+@@ -766,7 +766,7 @@ static int __init lttng_ring_buffer_client_init(void)
+ 	 * This vmalloc sync all also takes care of the lib ring buffer
+ 	 * vmalloc'd module pages when it is built as a module into LTTng.
+ 	 */
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	lttng_transport_register(&lttng_relay_transport);
+ 	return 0;
+ }
+diff --git a/lttng-ring-buffer-metadata-client.h b/lttng-ring-buffer-metadata-client.h
+index 17ffd75..a098b8d 100644
+--- a/lttng-ring-buffer-metadata-client.h
++++ b/lttng-ring-buffer-metadata-client.h
+@@ -9,7 +9,7 @@
+ 
+ #include <linux/module.h>
+ #include <linux/types.h>
+-#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_all() */
++#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
+ #include <lttng-events.h>
+ #include <lttng-tracer.h>
+ 
+@@ -428,7 +428,7 @@ static int __init lttng_ring_buffer_client_init(void)
+ 	 * This vmalloc sync all also takes care of the lib ring buffer
+ 	 * vmalloc'd module pages when it is built as a module into LTTng.
+ 	 */
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	lttng_transport_register(&lttng_relay_transport);
+ 	return 0;
+ }
+diff --git a/lttng-syscalls.c b/lttng-syscalls.c
+index fb14f6b..97f1ba9 100644
+--- a/lttng-syscalls.c
++++ b/lttng-syscalls.c
+@@ -760,7 +760,7 @@ int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
+ 	struct lttng_kernel_event ev;
+ 	int ret;
+ 
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 
+ 	if (!chan->sc_table) {
+ 		/* create syscall table mapping syscall to events */
+diff --git a/probes/lttng-kprobes.c b/probes/lttng-kprobes.c
+index c0a15e4..a44eaa1 100644
+--- a/probes/lttng-kprobes.c
++++ b/probes/lttng-kprobes.c
+@@ -132,7 +132,7 @@ int lttng_kprobes_register(const char *name,
+ 	 * Well.. kprobes itself puts the page fault handler on the blacklist,
+ 	 * but we can never be too careful.
+ 	 */
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 
+ 	ret = register_kprobe(&event->u.kprobe.kp);
+ 	if (ret)
+diff --git a/probes/lttng-kretprobes.c b/probes/lttng-kretprobes.c
+index 4b18d46..ab98ff2 100644
+--- a/probes/lttng-kretprobes.c
++++ b/probes/lttng-kretprobes.c
+@@ -221,7 +221,7 @@ int lttng_kretprobes_register(const char *name,
+ 	 * Well.. kprobes itself puts the page fault handler on the blacklist,
+ 	 * but we can never be too careful.
+ 	 */
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 
+ 	ret = register_kretprobe(&lttng_krp->krp);
+ 	if (ret)
+diff --git a/probes/lttng-tracepoint-event-impl.h b/probes/lttng-tracepoint-event-impl.h
+index 321cdfa..77b8638 100644
+--- a/probes/lttng-tracepoint-event-impl.h
++++ b/probes/lttng-tracepoint-event-impl.h
+@@ -15,7 +15,7 @@
+ #include <probes/lttng.h>
+ #include <probes/lttng-types.h>
+ #include <probes/lttng-probe-user.h>
+-#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_all() */
++#include <wrapper/vmalloc.h>	/* for wrapper_vmalloc_sync_mappings() */
+ #include <wrapper/ringbuffer/frontend_types.h>
+ #include <wrapper/ringbuffer/backend.h>
+ #include <wrapper/rcu.h>
+@@ -1391,7 +1391,7 @@ static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
+ #ifndef TP_MODULE_NOINIT
+ static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
+ {
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	return lttng_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
+ }
+ 
+diff --git a/probes/lttng-uprobes.c b/probes/lttng-uprobes.c
+index 64d8237..bc10128 100644
+--- a/probes/lttng-uprobes.c
++++ b/probes/lttng-uprobes.c
+@@ -161,7 +161,7 @@ int lttng_uprobes_add_callsite(struct lttng_event *event,
+ 	}
+ 
+ 	/* Ensure the memory we just allocated don't trigger page faults. */
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 
+ 	uprobe_handler->event = event;
+ 	uprobe_handler->up_consumer.handler = lttng_uprobes_handler_pre;
+diff --git a/probes/lttng.c b/probes/lttng.c
+index 383202c..05bc138 100644
+--- a/probes/lttng.c
++++ b/probes/lttng.c
+@@ -116,7 +116,7 @@ int __init lttng_logger_init(void)
+ {
+ 	int ret = 0;
+ 
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 
+ 	/* /dev/lttng-logger */
+ 	ret = misc_register(&logger_dev);
+diff --git a/tests/probes/lttng-test.c b/tests/probes/lttng-test.c
+index e347639..b450e7d 100644
+--- a/tests/probes/lttng-test.c
++++ b/tests/probes/lttng-test.c
+@@ -97,7 +97,7 @@ int __init lttng_test_init(void)
+ 	int ret = 0;
+ 
+ 	(void) wrapper_lttng_fixup_sig(THIS_MODULE);
+-	wrapper_vmalloc_sync_all();
++	wrapper_vmalloc_sync_mappings();
+ 	lttng_test_filter_event_dentry =
+ 			proc_create_data(LTTNG_TEST_FILTER_EVENT_FILE,
+ 				S_IRUGO | S_IWUGO, NULL,
+diff --git a/wrapper/vmalloc.h b/wrapper/vmalloc.h
+index 0c3eb86..54715b5 100644
+--- a/wrapper/vmalloc.h
++++ b/wrapper/vmalloc.h
+@@ -21,8 +21,35 @@
+ #include <linux/kallsyms.h>
+ #include <wrapper/kallsyms.h>
+ 
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
++
++static inline
++void wrapper_vmalloc_sync_mappings(void)
++{
++	void (*vmalloc_sync_mappings_sym)(void);
++
++	vmalloc_sync_mappings_sym = (void *) kallsyms_lookup_funcptr("vmalloc_sync_mappings");
++	if (vmalloc_sync_mappings_sym) {
++		vmalloc_sync_mappings_sym();
++	} else {
++#ifdef CONFIG_X86
++		/*
++		 * Only x86 needs vmalloc_sync_mappings to make sure LTTng does not
++		 * trigger recursive page faults.
++		 */
++		printk_once(KERN_WARNING "LTTng: vmalloc_sync_mappings symbol lookup failed.\n");
++		printk_once(KERN_WARNING "Page fault handler and NMI tracing might trigger faults.\n");
++#endif
++	}
++}
++
++#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++
++/*
++ * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7.
++ */
+ static inline
+-void wrapper_vmalloc_sync_all(void)
++void wrapper_vmalloc_sync_mappings(void)
+ {
+ 	void (*vmalloc_sync_all_sym)(void);
+ 
+@@ -40,13 +67,29 @@ void wrapper_vmalloc_sync_all(void)
+ #endif
+ 	}
+ }
++
++#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++
+ #else
+ 
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
++
++static inline
++void wrapper_vmalloc_sync_mappings(void)
++{
++	return vmalloc_sync_mappings();
++}
++
++#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++
+ static inline
+-void wrapper_vmalloc_sync_all(void)
++void wrapper_vmalloc_sync_mappings(void)
+ {
+ 	return vmalloc_sync_all();
+ }
++
++#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++
+ #endif
+ 
+ #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,12,0))
+@@ -61,7 +104,7 @@ void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
+ 		 * Make sure we don't trigger recursive page faults in the
+ 		 * tracing fast path.
+ 		 */
+-		wrapper_vmalloc_sync_all();
++		wrapper_vmalloc_sync_mappings();
+ 	}
+ 	return ret;
+ }
+-- 
+2.17.1
+
diff --git a/meta/recipes-kernel/lttng/lttng-modules/0002-Fix-missing-wrapper-rename-to-wrapper_vmalloc_sync_m.patch b/meta/recipes-kernel/lttng/lttng-modules/0002-Fix-missing-wrapper-rename-to-wrapper_vmalloc_sync_m.patch
new file mode 100644
index 0000000000..807fe933cd
--- /dev/null
+++ b/meta/recipes-kernel/lttng/lttng-modules/0002-Fix-missing-wrapper-rename-to-wrapper_vmalloc_sync_m.patch
@@ -0,0 +1,32 @@
+From 4d1817c129310945bf0b8227ebc0fbb4f6299dc7 Mon Sep 17 00:00:00 2001
+From: Michael Jeanson <mjeanson@efficios.com>
+Date: Wed, 6 May 2020 11:03:32 -0400
+Subject: [PATCH 2/4] Fix: missing wrapper rename to
+ wrapper_vmalloc_sync_mappings
+
+Upstream-Status: Backport [https://github.com/lttng/lttng-modules/commit/c1ba644f2edf6a5bc030111ce4167a8798cc1053]
+
+Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
+Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Change-Id: Idf7082a980c5a604bfef5c69906678b5083a9bbf
+Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
+---
+ wrapper/vmalloc.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/wrapper/vmalloc.h b/wrapper/vmalloc.h
+index 54715b5..5d0b389 100644
+--- a/wrapper/vmalloc.h
++++ b/wrapper/vmalloc.h
+@@ -216,7 +216,7 @@ void *lttng_kvmalloc_node(unsigned long size, gfp_t flags, int node)
+ 		 * Make sure we don't trigger recursive page faults in the
+ 		 * tracing fast path.
+ 		 */
+-		wrapper_vmalloc_sync_all();
++		wrapper_vmalloc_sync_mappings();
+ 	}
+ 	return ret;
+ }
+-- 
+2.17.1
+
diff --git a/meta/recipes-kernel/lttng/lttng-modules/0003-Fix-Use-vmalloc_sync_mappings-on-kernel-5.6-as-well.patch b/meta/recipes-kernel/lttng/lttng-modules/0003-Fix-Use-vmalloc_sync_mappings-on-kernel-5.6-as-well.patch
new file mode 100644
index 0000000000..48d7e2f00c
--- /dev/null
+++ b/meta/recipes-kernel/lttng/lttng-modules/0003-Fix-Use-vmalloc_sync_mappings-on-kernel-5.6-as-well.patch
@@ -0,0 +1,88 @@
+From 23cfd7b53ec1521d3c23ceddfda49352c2d349dc Mon Sep 17 00:00:00 2001
+From: Ovidiu Panait <ovidiu.panait@windriver.com>
+Date: Thu, 14 May 2020 13:05:24 +0300
+Subject: [PATCH 3/4] Fix: Use vmalloc_sync_mappings on kernel 5.6 as well
+
+Upstream commit [1], that got rid of vmalloc_sync_all and introduced
+vmalloc_sync_mappings, is a v5.6 commit:
+$ git tag --contains 763802b53a427ed3cbd419dbba255c414fdd9e7c
+v5.6
+v5.6-rc7
+v5.7-rc1
+v5.7-rc2
+v5.7-rc3
+
+Extend the LINUX_VERSION_CODE check to v5.6 to fix the following warnings:
+...
+[  483.242037] LTTng: vmalloc_sync_all symbol lookup failed.
+[  483.257056] Page fault handler and NMI tracing might trigger faults.
+...
+
+[1] https://github.com/torvalds/linux/commit/763802b53a427ed3cbd419dbba255c414fdd9e7c
+
+Upstream-Status: Backport [https://github.com/lttng/lttng-modules/commit/da356b324dfc160e09b8966b691792037badf455]
+
+Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
+Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
+---
+ wrapper/vmalloc.h | 12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/wrapper/vmalloc.h b/wrapper/vmalloc.h
+index 5d0b389..d905f60 100644
+--- a/wrapper/vmalloc.h
++++ b/wrapper/vmalloc.h
+@@ -21,7 +21,7 @@
+ #include <linux/kallsyms.h>
+ #include <wrapper/kallsyms.h>
+ 
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+ 
+ static inline
+ void wrapper_vmalloc_sync_mappings(void)
+@@ -43,7 +43,7 @@ void wrapper_vmalloc_sync_mappings(void)
+ 	}
+ }
+ 
+-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+ 
+ /*
+  * Map vmalloc_sync_mappings to vmalloc_sync_all() on kernels before 5.7.
+@@ -68,11 +68,11 @@ void wrapper_vmalloc_sync_mappings(void)
+ 	}
+ }
+ 
+-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+ 
+ #else
+ 
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0))
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+ 
+ static inline
+ void wrapper_vmalloc_sync_mappings(void)
+@@ -80,7 +80,7 @@ void wrapper_vmalloc_sync_mappings(void)
+ 	return vmalloc_sync_mappings();
+ }
+ 
+-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+ 
+ static inline
+ void wrapper_vmalloc_sync_mappings(void)
+@@ -88,7 +88,7 @@ void wrapper_vmalloc_sync_mappings(void)
+ 	return vmalloc_sync_all();
+ }
+ 
+-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,7,0)) */
++#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0)) */
+ 
+ #endif
+ 
+-- 
+2.17.1
+
diff --git a/meta/recipes-kernel/lttng/lttng-modules/0004-Update-Use-vmalloc_sync_mappings-for-stable-kernels.patch b/meta/recipes-kernel/lttng/lttng-modules/0004-Update-Use-vmalloc_sync_mappings-for-stable-kernels.patch
new file mode 100644
index 0000000000..a0b870486f
--- /dev/null
+++ b/meta/recipes-kernel/lttng/lttng-modules/0004-Update-Use-vmalloc_sync_mappings-for-stable-kernels.patch
@@ -0,0 +1,67 @@
+From f419315f28a1da656c4faa8a852a2928ce38c72d Mon Sep 17 00:00:00 2001
+From: Ovidiu Panait <ovidiu.panait@windriver.com>
+Date: Thu, 14 May 2020 14:27:17 +0300
+Subject: [PATCH 4/4] Update: Use vmalloc_sync_mappings for stable kernels
+
+Starting from v5.4.28/v5.2.37/v4.19.113/v4.14.175/v4.9.218/v4.4.218, stable
+kernel branches backported v5.6 upstream commit [1], causing the following
+warnings:
+...
+[  483.242037] LTTng: vmalloc_sync_all symbol lookup failed.
+[  483.257056] Page fault handler and NMI tracing might trigger faults.
+...
+
+Extend check for vmalloc_sync_mappings for stable kernels as well.
+
+[1] https://github.com/torvalds/linux/commit/763802b53a427ed3cbd419dbba255c414fdd9e7c
+
+[ Edit: minor coding style fix by Mathieu Desnoyers. ]
+
+Upstream-Status: Backport [https://github.com/lttng/lttng-modules/commit/5939591f87dc291bc858caf72decfb8569d802e3]
+
+Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
+Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
+---
+ wrapper/vmalloc.h | 17 +++++++++++++++--
+ 1 file changed, 15 insertions(+), 2 deletions(-)
+
+diff --git a/wrapper/vmalloc.h b/wrapper/vmalloc.h
+index d905f60..c7538ae 100644
+--- a/wrapper/vmalloc.h
++++ b/wrapper/vmalloc.h
+@@ -20,8 +20,15 @@
+ 
+ #include <linux/kallsyms.h>
+ #include <wrapper/kallsyms.h>
++#include <lttng-kernel-version.h>
+ 
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
++  || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0)            \
++  || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0)            \
++  || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0)         \
++  || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0)         \
++  || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0)          \
++  || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0))
+ 
+ static inline
+ void wrapper_vmalloc_sync_mappings(void)
+@@ -72,7 +79,13 @@ void wrapper_vmalloc_sync_mappings(void)
+ 
+ #else
+ 
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0) \
++  || LTTNG_KERNEL_RANGE(5,4,28, 5,5,0)            \
++  || LTTNG_KERNEL_RANGE(5,2,37, 5,3,0)            \
++  || LTTNG_KERNEL_RANGE(4,19,113, 4,20,0)         \
++  || LTTNG_KERNEL_RANGE(4,14,175, 4,15,0)         \
++  || LTTNG_KERNEL_RANGE(4,9,218, 4,10,0)          \
++  || LTTNG_KERNEL_RANGE(4,4,218, 4,5,0))
+ 
+ static inline
+ void wrapper_vmalloc_sync_mappings(void)
+-- 
+2.17.1
+
diff --git a/meta/recipes-kernel/lttng/lttng-modules_2.12.0.bb b/meta/recipes-kernel/lttng/lttng-modules_2.12.0.bb
index f706f89621..4a6c42e3bf 100644
--- a/meta/recipes-kernel/lttng/lttng-modules_2.12.0.bb
+++ b/meta/recipes-kernel/lttng/lttng-modules_2.12.0.bb
@@ -11,6 +11,10 @@ COMPATIBLE_HOST = '(x86_64|i.86|powerpc|aarch64|mips|nios2|arm|riscv).*-linux'
 SRC_URI = "https://lttng.org/files/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://Makefile-Do-not-fail-if-CONFIG_TRACEPOINTS-is-not-en.patch \
            file://BUILD_RUNTIME_BUG_ON-vs-gcc7.patch \
+           file://0001-Update-for-kernel-5.7-use-vmalloc_sync_mappings-on-k.patch \
+           file://0002-Fix-missing-wrapper-rename-to-wrapper_vmalloc_sync_m.patch \
+           file://0003-Fix-Use-vmalloc_sync_mappings-on-kernel-5.6-as-well.patch \
+           file://0004-Update-Use-vmalloc_sync_mappings-for-stable-kernels.patch \
            "
 
 SRC_URI[md5sum] = "be252df5013ea03894921d0b493c7b6c"