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Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c63
1 files changed, 20 insertions, 43 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 91a10472a39..13a54953a27 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -388,12 +388,12 @@ nocache:
addr = ALIGN(first->va_end, align);
if (addr < vstart)
goto nocache;
- if (addr + size - 1 < addr)
+ if (addr + size < addr)
goto overflow;
} else {
addr = ALIGN(vstart, align);
- if (addr + size - 1 < addr)
+ if (addr + size < addr)
goto overflow;
n = vmap_area_root.rb_node;
@@ -420,7 +420,7 @@ nocache:
if (addr + cached_hole_size < first->va_start)
cached_hole_size = first->va_start - addr;
addr = ALIGN(first->va_end, align);
- if (addr + size - 1 < addr)
+ if (addr + size < addr)
goto overflow;
if (list_is_last(&first->list, &vmap_area_list))
@@ -754,7 +754,6 @@ struct vmap_block {
struct vmap_area *va;
struct vmap_block_queue *vbq;
unsigned long free, dirty;
- DECLARE_BITMAP(alloc_map, VMAP_BBMAP_BITS);
DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
struct list_head free_list;
struct rcu_head rcu_head;
@@ -820,7 +819,6 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
vb->va = va;
vb->free = VMAP_BBMAP_BITS;
vb->dirty = 0;
- bitmap_zero(vb->alloc_map, VMAP_BBMAP_BITS);
bitmap_zero(vb->dirty_map, VMAP_BBMAP_BITS);
INIT_LIST_HEAD(&vb->free_list);
@@ -873,7 +871,6 @@ static void purge_fragmented_blocks(int cpu)
if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) {
vb->free = 0; /* prevent further allocs after releasing lock */
vb->dirty = VMAP_BBMAP_BITS; /* prevent purging it again */
- bitmap_fill(vb->alloc_map, VMAP_BBMAP_BITS);
bitmap_fill(vb->dirty_map, VMAP_BBMAP_BITS);
spin_lock(&vbq->lock);
list_del_rcu(&vb->free_list);
@@ -891,11 +888,6 @@ static void purge_fragmented_blocks(int cpu)
}
}
-static void purge_fragmented_blocks_thiscpu(void)
-{
- purge_fragmented_blocks(smp_processor_id());
-}
-
static void purge_fragmented_blocks_allcpus(void)
{
int cpu;
@@ -910,7 +902,6 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
struct vmap_block *vb;
unsigned long addr = 0;
unsigned int order;
- int purge = 0;
BUG_ON(size & ~PAGE_MASK);
BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
@@ -934,17 +925,7 @@ again:
if (vb->free < 1UL << order)
goto next;
- i = bitmap_find_free_region(vb->alloc_map,
- VMAP_BBMAP_BITS, order);
-
- if (i < 0) {
- if (vb->free + vb->dirty == VMAP_BBMAP_BITS) {
- /* fragmented and no outstanding allocations */
- BUG_ON(vb->dirty != VMAP_BBMAP_BITS);
- purge = 1;
- }
- goto next;
- }
+ i = VMAP_BBMAP_BITS - vb->free;
addr = vb->va->va_start + (i << PAGE_SHIFT);
BUG_ON(addr_to_vb_idx(addr) !=
addr_to_vb_idx(vb->va->va_start));
@@ -960,9 +941,6 @@ next:
spin_unlock(&vb->lock);
}
- if (purge)
- purge_fragmented_blocks_thiscpu();
-
put_cpu_var(vmap_block_queue);
rcu_read_unlock();
@@ -1311,15 +1289,15 @@ static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
spin_unlock(&vmap_area_lock);
}
-static void clear_vm_unlist(struct vm_struct *vm)
+static void clear_vm_uninitialized_flag(struct vm_struct *vm)
{
/*
- * Before removing VM_UNLIST,
+ * Before removing VM_UNINITIALIZED,
* we should make sure that vm has proper values.
* Pair with smp_rmb() in show_numa_info().
*/
smp_wmb();
- vm->flags &= ~VM_UNLIST;
+ vm->flags &= ~VM_UNINITIALIZED;
}
static struct vm_struct *__get_vm_area_node(unsigned long size,
@@ -1453,7 +1431,7 @@ static void __vunmap(const void *addr, int deallocate_pages)
return;
if (WARN(!PAGE_ALIGNED(addr), "Trying to vfree() bad address (%p)\n",
- addr));
+ addr))
return;
area = remove_vm_area(addr);
@@ -1499,7 +1477,6 @@ static void __vunmap(const void *addr, int deallocate_pages)
* conventions for vfree() arch-depenedent would be a really bad idea)
*
* NOTE: assumes that the object at *addr has a size >= sizeof(llist_node)
- *
*/
void vfree(const void *addr)
{
@@ -1511,8 +1488,8 @@ void vfree(const void *addr)
return;
if (unlikely(in_interrupt())) {
struct vfree_deferred *p = &__get_cpu_var(vfree_deferred);
- llist_add((struct llist_node *)addr, &p->list);
- schedule_work(&p->wq);
+ if (llist_add((struct llist_node *)addr, &p->list))
+ schedule_work(&p->wq);
} else
__vunmap(addr, 1);
}
@@ -1657,21 +1634,21 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
if (!size || (size >> PAGE_SHIFT) > totalram_pages)
goto fail;
- area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNLIST,
+ area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED,
start, end, node, gfp_mask, caller);
if (!area)
goto fail;
addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller);
if (!addr)
- return NULL;
+ goto fail;
/*
- * In this function, newly allocated vm_struct has VM_UNLIST flag.
- * It means that vm_struct is not fully initialized.
+ * In this function, newly allocated vm_struct has VM_UNINITIALIZED
+ * flag. It means that vm_struct is not fully initialized.
* Now, it is fully initialized, so remove this flag here.
*/
- clear_vm_unlist(area);
+ clear_vm_uninitialized_flag(area);
/*
* A ref_count = 3 is needed because the vm_struct and vmap_area
@@ -2591,11 +2568,6 @@ static void show_numa_info(struct seq_file *m, struct vm_struct *v)
if (!counters)
return;
- /* Pair with smp_wmb() in clear_vm_unlist() */
- smp_rmb();
- if (v->flags & VM_UNLIST)
- return;
-
memset(counters, 0, nr_node_ids * sizeof(unsigned int));
for (nr = 0; nr < v->nr_pages; nr++)
@@ -2624,6 +2596,11 @@ static int s_show(struct seq_file *m, void *p)
v = va->vm;
+ /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
+ smp_rmb();
+ if (v->flags & VM_UNINITIALIZED)
+ return 0;
+
seq_printf(m, "0x%pK-0x%pK %7ld",
v->addr, v->addr + v->size, v->size);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-17 10:02:07 +0000