slackbuilds-current/system/nvidia-kernel/nvidia-rcu_read_lock-unlock.patch

--- a/kernel/common/inc/nv-linux.h
+++ b/kernel/common/inc/nv-linux.h
@@ -1990,2 +1990,23 @@
 
+#if defined(CONFIG_HAVE_ARCH_PFN_VALID) || LINUX_VERSION_CODE < KERNEL_VERSION(6,1,76)
+#  define nv_pfn_valid pfn_valid
+#else
+/* pre-6.1.76 kernel pfn_valid version without GPL rcu_read_lock/unlock() */
+static inline int nv_pfn_valid(unsigned long pfn)
+{
+        struct mem_section *ms;
+
+        if (PHYS_PFN(PFN_PHYS(pfn)) != pfn)
+                return 0;
+
+        if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
+                return 0;
+
+        ms = __pfn_to_section(pfn);
+        if (!valid_section(ms))
+                return 0;
+
+        return early_section(ms) || pfn_section_valid(ms, pfn);
+}
+#endif
 #endif  /* _NV_LINUX_H_ */
--- a/kernel/nvidia/nv-mmap.c
+++ b/kernel/nvidia/nv-mmap.c
@@ -576,3 +576,3 @@
             if (!IS_REG_OFFSET(nv, access_start, access_len) &&
-                (pfn_valid(PFN_DOWN(mmap_start))))
+                (nv_pfn_valid(PFN_DOWN(mmap_start))))
             {
--- a/kernel/nvidia/os-mlock.c
+++ b/kernel/nvidia/os-mlock.c
@@ -102,3 +102,3 @@
         if ((nv_follow_pfn(vma, (start + (i * PAGE_SIZE)), &pfn) < 0) ||
-            (!pfn_valid(pfn)))
+            (!nv_pfn_valid(pfn)))
         {
@@ -176,3 +176,3 @@
 
-    if (pfn_valid(pfn))
+    if (nv_pfn_valid(pfn))
     {