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