VFS dcache work (& misc)

kernel/Makefile

@@ -48,7 +48,7 @@ else
 # -Wno-missing-braces: Seems broken? At least it started spitting out weird ones for IPv6 code(IN6ADDR_ALL_NODES)
 #	  in onyx/net/ipv6.h
 CFLAGS:=$(CFLAGS) -Wno-null-pointer-arithmetic -Wno-unknown-attributes -Wno-error=unused-private-field \
-	-Wno-missing-braces -Wno-c99-designator -Wthread-safety
+	-Wno-missing-braces -Wno-c99-designator -Wthread-safety -Wno-thread-safety-precise
 endif
 
 # NOTE: I don't think pointer-overflow works with kernel pointers

kernel/arch/arm64/mmu.cpp

@@ -414,15 +414,6 @@ bool __paging_change_perms(struct mm_address_space *mm, void *addr, int prot)
     return true;
 }
 
-bool paging_change_perms(void *addr, int prot)
-{
-    struct mm_address_space *as = &kernel_address_space;
-    if ((unsigned long) addr < VM_HIGHER_HALF)
-        as = get_current_address_space();
-
-    return __paging_change_perms(as, addr, prot);
-}
-
 bool paging_write_protect(void *addr, struct mm_address_space *mm)
 {
     uint64_t *ptentry;
@@ -598,15 +589,6 @@ void paging_free_page_tables(struct mm_address_space *mm)
     free_page(phys_to_page((unsigned long) mm->arch_mmu.top_pt));
 }
 
-unsigned long get_mapping_info(void *addr)
-{
-    struct mm_address_space *as = &kernel_address_space;
-    if ((unsigned long) addr < VM_HIGHER_HALF)
-        as = get_current_address_space();
-
-    return __get_mapping_info(addr, as);
-}
-
 unsigned long __get_mapping_info(void *addr, struct mm_address_space *as)
 {
     unsigned long *ppt_entry;
@@ -1142,7 +1124,7 @@ static int arm64_mmu_fork(PML *parent_table, PML *child_table, unsigned int pt_l
 
         if (pt_level == PT_LEVEL || is_huge_page)
         {
-            const bool should_cow = old_region->vm_maptype == MAP_PRIVATE;
+            const bool should_cow = vma_private(old_region);
             child_table->entries[i] = pt_entry | (should_cow ? ARM64_MMU_READ_ONLY : 0);
             if (should_cow)
             {

kernel/arch/riscv64/fpu.cpp

@@ -106,6 +106,8 @@ static slab_cache *fpu_cache = nullptr;
  */
 void fpu_init_cache()
 {
+    if (fpu_cache)
+        return;
     fpu_cache = kmem_cache_create("fpu-state", save_size, fpu_get_save_alignment(), 0, nullptr);
     if (!fpu_cache)
         panic("Out of memory allocating fpu state");