Only needed with USE=-kernel-open to avoid GPL-only __vma_start_write,
not really runtime-tested but at least code does nothing for stable users
with <6.15..

https://github.com/NVIDIA/open-gpu-kernel-modules/issues/840#issuecomment-2906864735
https://github.com/CachyOS/kernel-patches/commit/914aea4298e3
--- a/kernel/nvidia/nv-mmap.c
+++ b/kernel/nvidia/nv-mmap.c
@@ -24,8 +24,15 @@
 #define  __NO_VERSION__
 
+#include <linux/version.h>
+
 #include "os-interface.h"
 #include "nv-linux.h"
 #include "nv_speculation_barrier.h"
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 15, 0)
+#define nv_vm_flags_set(v, f) vm_flags_reset((v), (v)->vm_flags | (f))
+#define nv_vm_flags_clear(v, f) vm_flags_reset((v), (v)->vm_flags & ~(f))
+#endif
+
 /*
  * The 'struct vm_operations' open() callback is called by the Linux
--- a/kernel/nvidia-drm/nvidia-drm-gem-user-memory.c
+++ b/kernel/nvidia-drm/nvidia-drm-gem-user-memory.c
@@ -45,4 +45,11 @@
 #endif
 
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 15, 0)
+#define nv_vm_flags_set(v, f) vm_flags_reset((v), (v)->vm_flags | (f))
+#define nv_vm_flags_clear(v, f) vm_flags_reset((v), (v)->vm_flags & ~(f))
+#endif
+
 static inline
 void __nv_drm_gem_user_memory_free(struct nv_drm_gem_object *nv_gem)
--- a/kernel/nvidia-drm/nvidia-drm-gem.c
+++ b/kernel/nvidia-drm/nvidia-drm-gem.c
@@ -52,4 +52,11 @@
 #include "nv-mm.h"
 
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 15, 0)
+#define nv_vm_flags_set(v, f) vm_flags_reset((v), (v)->vm_flags | (f))
+#define nv_vm_flags_clear(v, f) vm_flags_reset((v), (v)->vm_flags & ~(f))
+#endif
+
 void nv_drm_gem_free(struct drm_gem_object *gem)
 {
--- a/kernel/nvidia-uvm/uvm.c
+++ b/kernel/nvidia-uvm/uvm.c
@@ -22,4 +22,6 @@
 *******************************************************************************/
 
+#include <linux/version.h>
+
 #include "uvm_api.h"
 #include "uvm_global.h"
@@ -41,4 +43,9 @@
 #define NVIDIA_UVM_DEVICE_NAME          "nvidia-uvm"
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 15, 0)
+#define nv_vm_flags_set(v, f) vm_flags_reset((v), (v)->vm_flags | (f))
+#define nv_vm_flags_clear(v, f) vm_flags_reset((v), (v)->vm_flags & ~(f))
+#endif
+
 static dev_t g_uvm_base_dev;
 static struct cdev g_uvm_cdev;