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vmalloc: separate out insert_vmalloc_vm()

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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>
This commit is contained in:
Tejun Heo 2009-08-14 15:00:52 +09:00
parent bba174f5e0
commit cf88c79006
1 changed files with 24 additions and 21 deletions
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45
mm/vmalloc.c
View file

@ -1122,13 +1122,34 @@ EXPORT_SYMBOL_GPL(map_vm_area);
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 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
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 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
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;
}