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