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Author: Andreas Beckmann <anbe@debian.org>
Description: some hmm bits are not always available
hmm_pfn_to_page() was introduced in Linux 5.8
--- a/kernel-open/nvidia-uvm/uvm_linux.h
+++ b/kernel-open/nvidia-uvm/uvm_linux.h
@@ -118,7 +118,9 @@ static inline const struct cpumask *uvm_
// hmm_range_fault() needs CONFIG_HMM_MIRROR. To detect racing CPU invalidates
// of memory regions while hmm_range_fault() is being called, MMU interval
// notifiers are needed.
- #if defined(CONFIG_HMM_MIRROR) && defined(NV_MMU_INTERVAL_NOTIFIER)
+// hmm_pfn_to_page() was added in Linux 5.8 (2733ea144dcce)
+ #if defined(CONFIG_HMM_MIRROR) && defined(NV_MMU_INTERVAL_NOTIFIER) && \
+ LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
#define UVM_HMM_RANGE_FAULT_SUPPORTED() 1
#else
#define UVM_HMM_RANGE_FAULT_SUPPORTED() 0
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