From 0b267633e1648ef0ddc9fce9c22ca6300091cceb Mon Sep 17 00:00:00 2001
From: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>
Date: Wed, 29 Nov 2023 12:41:33 +0100
Subject: Add conditional build for kernels after 5.11

The function fcheck_files() is replaced by files_lookup_fd_rcu()
on kernel version > 5.11.0

Bug-AGL: SPEC-4834
Change-Id: Ie4adb383252a35066d1ed3be1caad29883503af5
Signed-off-by: Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com>
---
 loopback_driver.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/loopback_driver.c b/loopback_driver.c
index 452726c..950b2cb 100644
--- a/loopback_driver.c
+++ b/loopback_driver.c
@@ -65,6 +65,7 @@
 #include <linux/pagemap.h>
 
 #include <linux/delay.h>
+#include <linux/version.h>
 
 /* Features */
 MODULE_LICENSE("GPL v2");
@@ -1165,8 +1166,11 @@ static long loopback_ioctl(struct file *file,
 		userspace_task = pid_task(find_vpid(efd_data.pid), PIDTYPE_PID);
 
 		rcu_read_lock();
+#if LINUX_VERSION_CODE <  KERNEL_VERSION(5,11,0)
 		efd_file = files_lookup_fd_rcu(userspace_task->files, efd_data.efd[0]);
+#else
 		rcu_read_unlock();
+#endif
 
 		efd_ctx = eventfd_ctx_fileget(efd_file);
 		if (!efd_ctx)
-- 
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