ugly decklink fix, meh. (see revisions for even uglier fixes including slightly illegal license rewrites! fun for the whole family!)

0001-fix-for-linux-5.0-might-result-in-some-slowdown.patch

From 5248c039c1353bf3b5647cf1659004fbbf33ac54 Mon Sep 17 00:00:00 2001
From: Lukas Schauer <lukas@schauer.so>
Date: Wed, 6 Mar 2019 23:00:39 +0100
Subject: [PATCH] fix for linux 5.0 (might result in some slowdown)

---
 blackmagic-10.11.4a9/blackmagic_lib.c | 26 ++++++++++++++++++++++++--
 blackmagic-io-10.11.4a9/bm_util.c     | 13 +++++++++++--
 2 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/blackmagic-10.11.4a9/blackmagic_lib.c b/blackmagic-10.11.4a9/blackmagic_lib.c
index ffe0a89..89d83bd 100644
--- a/blackmagic-10.11.4a9/blackmagic_lib.c
+++ b/blackmagic-10.11.4a9/blackmagic_lib.c
@@ -74,8 +74,14 @@
 
 const unsigned int bmd_page_shift = PAGE_SHIFT;
 const unsigned int bmd_page_size = PAGE_SIZE;
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+const int bmd_verify_read = NULL;
+const int bmd_verify_write = NULL;
+#else
 const int bmd_verify_read = VERIFY_READ;
 const int bmd_verify_write = VERIFY_WRITE;
+#endif
 
 const char *DL_KERN_INFO = KERN_INFO;
 const char *DL_KERN_WARNING = KERN_WARNING;
@@ -353,7 +359,14 @@ dl_uptime(void)
 inline unsigned long long dl_get_time_us()
 {
 	struct timeval t;
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+	struct timespec64 ts;
+	ktime_get_real_ts64(&ts);
+	t.tv_sec = ts.tv_sec;
+	t.tv_usec = ts.tv_nsec / 1000;
+	#else
 	do_gettimeofday(&t);
+	#endif
 	return (t.tv_sec * USEC_PER_SEC + t.tv_usec);
 }
 
@@ -635,7 +648,12 @@ __dl_copy_to_user(void *to, const void *from, unsigned long n)
 inline int 
 dl_access_ok(int type, void *addr, unsigned long size)
 {
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+	(void) type;
+	return access_ok(addr, size);
+	#else
 	return access_ok(type, addr, size);
+	#endif
 }
 
 void *
@@ -803,7 +821,9 @@ dl_poll_wait(void *filp, struct dl_wait_queue_head_t *queue, void *wait, int wri
 inline void
 dl_kernel_fpu_begin()
 {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+	preempt_disable();
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
 	preempt_disable();
 	__kernel_fpu_begin();
 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0) || RHEL_RELEASE_OR_LATER(6, 10)
@@ -845,7 +865,9 @@ dl_kernel_fpu_begin()
 
 inline void dl_kernel_fpu_end(void)
 {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+	preempt_enable();
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
 	__kernel_fpu_end();
 	preempt_enable();
 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0) || RHEL_RELEASE_OR_LATER(6, 10)
diff --git a/blackmagic-io-10.11.4a9/bm_util.c b/blackmagic-io-10.11.4a9/bm_util.c
index 428605b..b58df1d 100644
--- a/blackmagic-io-10.11.4a9/bm_util.c
+++ b/blackmagic-io-10.11.4a9/bm_util.c
@@ -833,7 +833,12 @@ void bm_event_wakeup(void* event, bool one)
 // User IO
 unsigned long bm_access_ok(unsigned int type, void* addr, size_t size)
 {
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+	(void) type;
+	return access_ok(addr, size);
+	#else
 	return access_ok(type, addr, size);
+	#endif
 }
 
 unsigned long bm_copy_to_user(void *to, const void *from, unsigned len)
@@ -900,7 +905,9 @@ void bm_iowrite32be(uint32_t val, volatile void* addr)
 
 void bm_fpu_begin(void)
 {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+	preempt_disable();
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
 	preempt_disable();
 	__kernel_fpu_begin();
 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0) || RHEL_RELEASE_OR_LATER(6, 10)
@@ -942,7 +949,9 @@ void bm_fpu_begin(void)
 
 void bm_fpu_end(void)
 {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+	preempt_enable();
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
 	__kernel_fpu_end();
 	preempt_enable();
 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0) || RHEL_RELEASE_OR_LATER(6, 10)
-- 
2.21.0