#include <linux/rbtree.h>
#include <linux/radix-tree.h>
#include <linux/rcupdate.h>
+#include <linux/bootmem.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
BUG_ON(addr >= end);
pgd = pgd_offset_k(addr);
- flush_cache_vunmap(addr, end);
do {
next = pgd_addr_end(addr, end);
if (pgd_none_or_clear_bad(pgd))
*
* Ie. pte at addr+N*PAGE_SIZE shall point to pfn corresponding to pages[N]
*/
-static int vmap_page_range(unsigned long addr, unsigned long end,
+static int vmap_page_range(unsigned long start, unsigned long end,
pgprot_t prot, struct page **pages)
{
pgd_t *pgd;
unsigned long next;
+ unsigned long addr = start;
int err = 0;
int nr = 0;
if (err)
break;
} while (pgd++, addr = next, addr != end);
- flush_cache_vmap(addr, end);
+ flush_cache_vmap(start, end);
if (unlikely(err))
return err;
unsigned long addr;
int purged = 0;
+ BUG_ON(!size);
BUG_ON(size & ~PAGE_MASK);
- addr = ALIGN(vstart, align);
-
va = kmalloc_node(sizeof(struct vmap_area),
gfp_mask & GFP_RECLAIM_MASK, node);
if (unlikely(!va))
return ERR_PTR(-ENOMEM);
retry:
+ addr = ALIGN(vstart, align);
+
spin_lock(&vmap_area_lock);
+ if (addr + size - 1 < addr)
+ goto overflow;
+
/* XXX: could have a last_hole cache */
n = vmap_area_root.rb_node;
if (n) {
while (addr + size > first->va_start && addr + size <= vend) {
addr = ALIGN(first->va_end + PAGE_SIZE, align);
+ if (addr + size - 1 < addr)
+ goto overflow;
n = rb_next(&first->rb_node);
if (n)
}
found:
if (addr + size > vend) {
+overflow:
spin_unlock(&vmap_area_lock);
if (!purged) {
purge_vmap_area_lazy();
goto retry;
}
if (printk_ratelimit())
- printk(KERN_WARNING "vmap allocation failed: "
- "use vmalloc=<size> to increase size.\n");
+ printk(KERN_WARNING
+ "vmap allocation for size %lu failed: "
+ "use vmalloc=<size> to increase size.\n", size);
return ERR_PTR(-EBUSY);
}
vunmap_page_range(va->va_start, va->va_end);
}
+static void vmap_debug_free_range(unsigned long start, unsigned long end)
+{
+ /*
+ * Unmap page tables and force a TLB flush immediately if
+ * CONFIG_DEBUG_PAGEALLOC is set. This catches use after free
+ * bugs similarly to those in linear kernel virtual address
+ * space after a page has been freed.
+ *
+ * All the lazy freeing logic is still retained, in order to
+ * minimise intrusiveness of this debugging feature.
+ *
+ * This is going to be *slow* (linear kernel virtual address
+ * debugging doesn't do a broadcast TLB flush so it is a lot
+ * faster).
+ */
+#ifdef CONFIG_DEBUG_PAGEALLOC
+ vunmap_page_range(start, end);
+ flush_tlb_kernel_range(start, end);
+#endif
+}
+
/*
* lazy_max_pages is the maximum amount of virtual address space we gather up
* before attempting to purge with a TLB flush.
static DEFINE_SPINLOCK(purge_lock);
LIST_HEAD(valist);
struct vmap_area *va;
+ struct vmap_area *n_va;
int nr = 0;
/*
if (nr) {
spin_lock(&vmap_area_lock);
- list_for_each_entry(va, &valist, purge_list)
+ list_for_each_entry_safe(va, n_va, &valist, purge_list)
__free_vmap_area(va);
spin_unlock(&vmap_area_lock);
}
}
/*
+ * Kick off a purge of the outstanding lazy areas. Don't bother if somebody
+ * is already purging.
+ */
+static void try_purge_vmap_area_lazy(void)
+{
+ unsigned long start = ULONG_MAX, end = 0;
+
+ __purge_vmap_area_lazy(&start, &end, 0, 0);
+}
+
+/*
* Kick off a purge of the outstanding lazy areas.
*/
static void purge_vmap_area_lazy(void)
{
unsigned long start = ULONG_MAX, end = 0;
- __purge_vmap_area_lazy(&start, &end, 0, 0);
+ __purge_vmap_area_lazy(&start, &end, 1, 0);
}
/*
- * Free and unmap a vmap area
+ * Free and unmap a vmap area, caller ensuring flush_cache_vunmap had been
+ * called for the correct range previously.
*/
-static void free_unmap_vmap_area(struct vmap_area *va)
+static void free_unmap_vmap_area_noflush(struct vmap_area *va)
{
va->flags |= VM_LAZY_FREE;
atomic_add((va->va_end - va->va_start) >> PAGE_SHIFT, &vmap_lazy_nr);
if (unlikely(atomic_read(&vmap_lazy_nr) > lazy_max_pages()))
- purge_vmap_area_lazy();
+ try_purge_vmap_area_lazy();
+}
+
+/*
+ * Free and unmap a vmap area
+ */
+static void free_unmap_vmap_area(struct vmap_area *va)
+{
+ flush_cache_vunmap(va->va_start, va->va_end);
+ free_unmap_vmap_area_noflush(va);
}
static struct vmap_area *find_vmap_area(unsigned long addr)
spin_unlock(&vmap_block_tree_lock);
BUG_ON(tmp != vb);
- free_unmap_vmap_area(vb->va);
+ free_unmap_vmap_area_noflush(vb->va);
call_rcu(&vb->rcu_head, rcu_free_vb);
}
BUG_ON(size & ~PAGE_MASK);
BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
+
+ flush_cache_vunmap((unsigned long)addr, (unsigned long)addr + size);
+
order = get_order(size);
offset = (unsigned long)addr & (VMAP_BLOCK_SIZE - 1);
BUG_ON(addr & (PAGE_SIZE-1));
debug_check_no_locks_freed(mem, size);
+ vmap_debug_free_range(addr, addr+size);
if (likely(count <= VMAP_MAX_ALLOC))
vb_free(mem, size);
void __init vmalloc_init(void)
{
+ struct vmap_area *va;
+ struct vm_struct *tmp;
int i;
for_each_possible_cpu(i) {
vbq->nr_dirty = 0;
}
+ /* Import existing vmlist entries. */
+ for (tmp = vmlist; tmp; tmp = tmp->next) {
+ va = alloc_bootmem(sizeof(struct vmap_area));
+ va->flags = tmp->flags | VM_VM_AREA;
+ va->va_start = (unsigned long)tmp->addr;
+ va->va_end = va->va_start + tmp->size;
+ __insert_vmap_area(va);
+ }
vmap_initialized = true;
}
void unmap_kernel_range(unsigned long addr, unsigned long size)
{
unsigned long end = addr + size;
+
+ flush_cache_vunmap(addr, end);
vunmap_page_range(addr, end);
flush_tlb_kernel_range(addr, end);
}
}
EXPORT_SYMBOL_GPL(__get_vm_area);
+struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
+ unsigned long start, unsigned long end,
+ void *caller)
+{
+ return __get_vm_area_node(size, flags, start, end, -1, GFP_KERNEL,
+ caller);
+}
+
/**
* get_vm_area - reserve a contiguous kernel virtual area
* @size: size of the area
if (va && va->flags & VM_VM_AREA) {
struct vm_struct *vm = va->private;
struct vm_struct *tmp, **p;
+
+ vmap_debug_free_range(va->va_start, va->va_end);
free_unmap_vmap_area(va);
vm->size -= PAGE_SIZE;
struct vm_struct *area;
void *ret;
- ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);
+ ret = __vmalloc_node(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
+ PAGE_KERNEL, -1, __builtin_return_address(0));
if (ret) {
area = find_vm_area(ret);
area->flags |= VM_USERMAP;
void *vmalloc_exec(unsigned long size)
{
- return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC);
+ return __vmalloc_node(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC,
+ -1, __builtin_return_address(0));
}
#if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)
*/
void *vmalloc_32(unsigned long size)
{
- return __vmalloc(size, GFP_VMALLOC32, PAGE_KERNEL);
+ return __vmalloc_node(size, GFP_VMALLOC32, PAGE_KERNEL,
+ -1, __builtin_return_address(0));
}
EXPORT_SYMBOL(vmalloc_32);
struct vm_struct *area;
void *ret;
- ret = __vmalloc(size, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL);
+ ret = __vmalloc_node(size, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL,
+ -1, __builtin_return_address(0));
if (ret) {
area = find_vm_area(ret);
area->flags |= VM_USERMAP;
v->addr, v->addr + v->size, v->size);
if (v->caller) {
- char buff[2 * KSYM_NAME_LEN];
+ char buff[KSYM_SYMBOL_LEN];
seq_putc(m, ' ');
sprint_symbol(buff, (unsigned long)v->caller);