1 files changed, 91 insertions, 3 deletions

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 11a929872ebd..af58324c361a 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -24,6 +24,7 @@
 #include <linux/radix-tree.h>
 #include <linux/rcupdate.h>
 #include <linux/bootmem.h>
+#include <linux/pfn.h>
 
 #include <asm/atomic.h>
 #include <asm/uaccess.h>
@@ -152,8 +153,8 @@ static int vmap_pud_range(pgd_t *pgd, unsigned long addr,
  *
  * Ie. pte at addr+N*PAGE_SIZE shall point to pfn corresponding to pages[N]
  */
-static int vmap_page_range(unsigned long start, unsigned long end,
-                                pgprot_t prot, struct page **pages)
+static int vmap_page_range_noflush(unsigned long start, unsigned long end,
+                                   pgprot_t prot, struct page **pages)
 {
         pgd_t *pgd;
         unsigned long next;
@@ -169,13 +170,22 @@ static int vmap_page_range(unsigned long start, unsigned long end,
                 if (err)
                         break;
         } while (pgd++, addr = next, addr != end);
-        flush_cache_vmap(start, end);
 
         if (unlikely(err))
                 return err;
         return nr;
 }
 
+static int vmap_page_range(unsigned long start, unsigned long end,
+                           pgprot_t prot, struct page **pages)
+{
+        int ret;
+
+        ret = vmap_page_range_noflush(start, end, prot, pages);
+        flush_cache_vmap(start, end);
+        return ret;
+}
+
 static inline int is_vmalloc_or_module_addr(const void *x)
 {
         /*
@@ -990,6 +1000,32 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t pro
 }
 EXPORT_SYMBOL(vm_map_ram);
 
+/**
+ * vm_area_register_early - register vmap area early during boot
+ * @vm: vm_struct to register
+ * @align: requested alignment
+ *
+ * This function is used to register kernel vm area before
+ * vmalloc_init() is called.  @vm->size and @vm->flags should contain
+ * proper values on entry and other fields should be zero.  On return,
+ * vm->addr contains the allocated address.
+ *
+ * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
+ */
+void __init vm_area_register_early(struct vm_struct *vm, size_t align)
+{
+        static size_t vm_init_off __initdata;
+        unsigned long addr;
+
+        addr = ALIGN(VMALLOC_START + vm_init_off, align);
+        vm_init_off = PFN_ALIGN(addr + vm->size) - VMALLOC_START;
+
+        vm->addr = (void *)addr;
+
+        vm->next = vmlist;
+        vmlist = vm;
+}
+
 void __init vmalloc_init(void)
 {
         struct vmap_area *va;
@@ -1017,6 +1053,58 @@ void __init vmalloc_init(void)
         vmap_initialized = true;
 }
 
+/**
+ * map_kernel_range_noflush - map kernel VM area with the specified pages
+ * @addr: start of the VM area to map
+ * @size: size of the VM area to map
+ * @prot: page protection flags to use
+ * @pages: pages to map
+ *
+ * Map PFN_UP(@size) pages at @addr.  The VM area @addr and @size
+ * specify should have been allocated using get_vm_area() and its
+ * friends.
+ *
+ * NOTE:
+ * This function does NOT do any cache flushing.  The caller is
+ * responsible for calling flush_cache_vmap() on to-be-mapped areas
+ * before calling this function.
+ *
+ * RETURNS:
+ * The number of pages mapped on success, -errno on failure.
+ */
+int map_kernel_range_noflush(unsigned long addr, unsigned long size,
+                             pgprot_t prot, struct page **pages)
+{
+        return vmap_page_range_noflush(addr, addr + size, prot, pages);
+}
+
+/**
+ * unmap_kernel_range_noflush - unmap kernel VM area
+ * @addr: start of the VM area to unmap
+ * @size: size of the VM area to unmap
+ *
+ * Unmap PFN_UP(@size) pages at @addr.  The VM area @addr and @size
+ * specify should have been allocated using get_vm_area() and its
+ * friends.
+ *
+ * NOTE:
+ * This function does NOT do any cache flushing.  The caller is
+ * responsible for calling flush_cache_vunmap() on to-be-mapped areas
+ * before calling this function and flush_tlb_kernel_range() after.
+ */
+void unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
+{
+        vunmap_page_range(addr, addr + size);
+}
+
+/**
+ * unmap_kernel_range - unmap kernel VM area and flush cache and TLB
+ * @addr: start of the VM area to unmap
+ * @size: size of the VM area to unmap
+ *
+ * Similar to unmap_kernel_range_noflush() but flushes vcache before
+ * the unmapping and tlb after.
+ */
 void unmap_kernel_range(unsigned long addr, unsigned long size)
 {
         unsigned long end = addr + size;