kernel: add c++ support

include/socks/vm.h

@@ -8,6 +8,10 @@
 #include <socks/locks.h>
 #include <socks/machine/vm.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* maximum number of NUMA nodes */
 #define VM_MAX_NODES 64
 /* maximum number of memory zones per node */
@@ -185,8 +189,9 @@ typedef struct vm_slab {
 	   when freeing:
 	     - s_free should be set to the index of the object being freed.
 	     - s_freelist[s_free] should be set to the previous value of s_free.
+	   this is commented as it as flexible arrays are not supported in c++.
 	   */
-	unsigned int s_freelist[];
+	//unsigned int s_freelist[];
 } vm_slab_t;
 
 typedef struct vm_page {
@@ -212,9 +217,7 @@ typedef struct vm_page {
 
 	/* owner-specific data */
 	union {
-		struct {
-			vm_slab_t *p_slab;
-		};
+		vm_slab_t *p_slab;
 	};
 
 } __attribute__((aligned(2 * sizeof(unsigned long)))) vm_page_t;
@@ -287,4 +290,8 @@ extern void vm_sparse_init(void);
 extern vm_page_t *vm_page_get_sparse(phys_addr_t addr);
 extern size_t vm_page_get_pfn_sparse(vm_page_t *pg);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif