lttng-modules: add bbappend

Backport patches from upstream to fix build errors when building
with kernel v5.1. These patches are backported from stable branch.

The code v5.1 is protected by ifdefs so v4.19 works as well.

Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/recipes-kernel/lttng/lttng-modules/0001-Fix-mm-create-the-new-vm_fault_t-type-v5.1.patch b/recipes-kernel/lttng/lttng-modules/0001-Fix-mm-create-the-new-vm_fault_t-type-v5.1.patch
new file mode 100644
index 00000000..12e32e84
--- /dev/null
+++ b/recipes-kernel/lttng/lttng-modules/0001-Fix-mm-create-the-new-vm_fault_t-type-v5.1.patch
@@ -0,0 +1,66 @@
+From 55026979d71852aa2cf5e19bb4adb2db98affd1e Mon Sep 17 00:00:00 2001
+From: Michael Jeanson <mjeanson@efficios.com>
+Date: Mon, 18 Mar 2019 16:20:32 -0400
+Subject: [PATCH 1/5] Fix: mm: create the new vm_fault_t type (v5.1)
+
+See upstream commit:
+
+  commit 3d3539018d2cbd12e5af4a132636ee7fd8d43ef0
+  Author: Souptick Joarder <jrdr.linux@gmail.com>
+  Date:   Thu Mar 7 16:31:14 2019 -0800
+
+    mm: create the new vm_fault_t type
+
+    Page fault handlers are supposed to return VM_FAULT codes, but some
+    drivers/file systems mistakenly return error numbers.  Now that all
+    drivers/file systems have been converted to use the vm_fault_t return
+    type, change the type definition to no longer be compatible with 'int'.
+    By making it an unsigned int, the function prototype becomes
+    incompatible with a function which returns int.  Sparse will detect any
+    attempts to return a value which is not a VM_FAULT code.
+
+    VM_FAULT_SET_HINDEX and VM_FAULT_GET_HINDEX values are changed to avoid
+    conflict with other VM_FAULT codes.
+
+Upstream-Status: Backport [http://git.lttng.org/?p=lttng-modules.git;a=commit;h=2ca0c84f0b4a915c555a0b83102d94ac941619ca]
+
+Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
+---
+ lib/ringbuffer/ring_buffer_mmap.c | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/lib/ringbuffer/ring_buffer_mmap.c b/lib/ringbuffer/ring_buffer_mmap.c
+index 4b1b7b3..6592a82 100644
+--- a/lib/ringbuffer/ring_buffer_mmap.c
++++ b/lib/ringbuffer/ring_buffer_mmap.c
+@@ -32,7 +32,11 @@
+ /*
+  * fault() vm_op implementation for ring buffer file mapping.
+  */
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
++static vm_fault_t lib_ring_buffer_fault_compat(struct vm_area_struct *vma, struct vm_fault *vmf)
++#else
+ static int lib_ring_buffer_fault_compat(struct vm_area_struct *vma, struct vm_fault *vmf)
++#endif
+ {
+        struct lib_ring_buffer *buf = vma->vm_private_data;
+        struct channel *chan = buf->backend.chan;
+@@ -65,7 +69,13 @@ static int lib_ring_buffer_fault_compat(struct vm_area_struct *vma, struct vm_fa
+        return 0;
+ }
+ 
+-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0))
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
++static vm_fault_t lib_ring_buffer_fault(struct vm_fault *vmf)
++{
++       struct vm_area_struct *vma = vmf->vma;
++       return lib_ring_buffer_fault_compat(vma, vmf);
++}
++#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0))
+ static int lib_ring_buffer_fault(struct vm_fault *vmf)
+ {
+        struct vm_area_struct *vma = vmf->vma;
+-- 
+2.17.0
+