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-rw-r--r--mm/vmalloc.c58
1 files changed, 37 insertions, 21 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 84feb5249b12..21ec16b7e6e1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -796,13 +796,31 @@ static unsigned long addr_to_vb_idx(unsigned long addr)
return addr;
}
-static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
+static void *vmap_block_vaddr(unsigned long va_start, unsigned long pages_off)
+{
+ unsigned long addr;
+
+ addr = va_start + (pages_off << PAGE_SHIFT);
+ BUG_ON(addr_to_vb_idx(addr) != addr_to_vb_idx(va_start));
+ return (void *)addr;
+}
+
+/**
+ * new_vmap_block - allocates new vmap_block and occupies 2^order pages in this
+ * block. Of course pages number can't exceed VMAP_BBMAP_BITS
+ * @order: how many 2^order pages should be occupied in newly allocated block
+ * @gfp_mask: flags for the page level allocator
+ *
+ * Returns: virtual address in a newly allocated block or ERR_PTR(-errno)
+ */
+static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
{
struct vmap_block_queue *vbq;
struct vmap_block *vb;
struct vmap_area *va;
unsigned long vb_idx;
int node, err;
+ void *vaddr;
node = numa_node_id();
@@ -826,9 +844,12 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
return ERR_PTR(err);
}
+ vaddr = vmap_block_vaddr(va->va_start, 0);
spin_lock_init(&vb->lock);
vb->va = va;
- vb->free = VMAP_BBMAP_BITS;
+ /* At least something should be left free */
+ BUG_ON(VMAP_BBMAP_BITS <= (1UL << order));
+ vb->free = VMAP_BBMAP_BITS - (1UL << order);
vb->dirty = 0;
bitmap_zero(vb->dirty_map, VMAP_BBMAP_BITS);
INIT_LIST_HEAD(&vb->free_list);
@@ -846,7 +867,7 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
spin_unlock(&vbq->lock);
put_cpu_var(vmap_block_queue);
- return vb;
+ return vaddr;
}
static void free_vmap_block(struct vmap_block *vb)
@@ -910,7 +931,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
{
struct vmap_block_queue *vbq;
struct vmap_block *vb;
- unsigned long addr = 0;
+ void *vaddr = NULL;
unsigned int order;
BUG_ON(size & ~PAGE_MASK);
@@ -925,43 +946,38 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
}
order = get_order(size);
-again:
rcu_read_lock();
vbq = &get_cpu_var(vmap_block_queue);
list_for_each_entry_rcu(vb, &vbq->free, free_list) {
- int i;
+ unsigned long pages_off;
spin_lock(&vb->lock);
- if (vb->free < 1UL << order)
- goto next;
+ if (vb->free < (1UL << order)) {
+ spin_unlock(&vb->lock);
+ continue;
+ }
- 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));
+ pages_off = VMAP_BBMAP_BITS - vb->free;
+ vaddr = vmap_block_vaddr(vb->va->va_start, pages_off);
vb->free -= 1UL << order;
if (vb->free == 0) {
spin_lock(&vbq->lock);
list_del_rcu(&vb->free_list);
spin_unlock(&vbq->lock);
}
+
spin_unlock(&vb->lock);
break;
-next:
- spin_unlock(&vb->lock);
}
put_cpu_var(vmap_block_queue);
rcu_read_unlock();
- if (!addr) {
- vb = new_vmap_block(gfp_mask);
- if (IS_ERR(vb))
- return vb;
- goto again;
- }
+ /* Allocate new block if nothing was found */
+ if (!vaddr)
+ vaddr = new_vmap_block(order, gfp_mask);
- return (void *)addr;
+ return vaddr;
}
static void vb_free(const void *addr, unsigned long size)