use MAX_MCACHE_ORDER instead of hard-coded

Author: 0x5459

kernel-open/nvidia-uvm/uvm_kvmalloc.c

@@ -257,7 +257,6 @@ static void *alloc_internal(size_t size, bool zero_memory)
     // Make sure that (sizeof(hdr) + size) is what it should be
     BUILD_BUG_ON(sizeof(uvm_vmalloc_hdr_t) != offsetof(uvm_vmalloc_hdr_t *, ptr));
 
-    assert(size <= (1 << 32));
     if (size <= UVM_KMALLOC_THRESHOLD) {
         if (zero_memory)
             return kzalloc(size, NV_UVM_GFP_FLAGS);

kernel-open/nvidia-uvm/uvm_kvmalloc.h

@@ -27,6 +27,11 @@
 #include "uvm_nanos.h"
 #include "uvm_test_ioctl.h"
 
+#ifndef _CONFIG_H_
+#include <config.h>
+#define _CONFIG_H_
+#endif
+
 // kmalloc is faster than vmalloc because it doesn't have to remap kernel
 // virtual memory, but for that same reason it requires physically-contiguous
 // memory. It also supports a native krealloc function which is missing in
@@ -41,9 +46,7 @@
 //
 // This is in the header so callers can use it to inform their allocation sizes
 // if they wish.
-//
-// Default value is 16. See: https://github.com/nanovms/nanos/blob/103518003874e7c8c3cb6e5a93d81fd0f197fde6/src/config.h#L84-L85
-#define UVM_KMALLOC_THRESHOLD 16
+#define UVM_KMALLOC_THRESHOLD (1 << MAX_MCACHE_ORDER)
 
 NV_STATUS uvm_kvmalloc_init(void);
 void uvm_kvmalloc_exit(void);