vmalloc: separate out insert_vmalloc_vm()
Separate out insert_vmalloc_vm() from __get_vm_area_node().
insert_vmalloc_vm() initializes vm_struct from vmap_area and inserts
it into vmlist. insert_vmalloc_vm() only initializes fields which can
be determined from @vm, @flags and @caller The rest should be
initialized by the caller. For __get_vm_area_node(), all other fields
just need to be cleared and this is done by using kzalloc instead of
kmalloc.
This will be used to implement pcpu_get_vm_areas().
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Nick Piggin <npiggin@suse.de>
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index f8189a4..2eb461c 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1122,13 +1122,34 @@
DEFINE_RWLOCK(vmlist_lock);
struct vm_struct *vmlist;
+static void insert_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
+ unsigned long flags, void *caller)
+{
+ struct vm_struct *tmp, **p;
+
+ vm->flags = flags;
+ vm->addr = (void *)va->va_start;
+ vm->size = va->va_end - va->va_start;
+ vm->caller = caller;
+ va->private = vm;
+ va->flags |= VM_VM_AREA;
+
+ write_lock(&vmlist_lock);
+ for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
+ if (tmp->addr >= vm->addr)
+ break;
+ }
+ vm->next = *p;
+ *p = vm;
+ write_unlock(&vmlist_lock);
+}
+
static struct vm_struct *__get_vm_area_node(unsigned long size,
unsigned long flags, unsigned long start, unsigned long end,
int node, gfp_t gfp_mask, void *caller)
{
static struct vmap_area *va;
struct vm_struct *area;
- struct vm_struct *tmp, **p;
unsigned long align = 1;
BUG_ON(in_interrupt());
@@ -1147,7 +1168,7 @@
if (unlikely(!size))
return NULL;
- area = kmalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);
+ area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);
if (unlikely(!area))
return NULL;
@@ -1162,25 +1183,7 @@
return NULL;
}
- area->flags = flags;
- area->addr = (void *)va->va_start;
- area->size = size;
- area->pages = NULL;
- area->nr_pages = 0;
- area->phys_addr = 0;
- area->caller = caller;
- va->private = area;
- va->flags |= VM_VM_AREA;
-
- write_lock(&vmlist_lock);
- for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
- if (tmp->addr >= area->addr)
- break;
- }
- area->next = *p;
- *p = area;
- write_unlock(&vmlist_lock);
-
+ insert_vmalloc_vm(area, va, flags, caller);
return area;
}