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vmap: cope with vm_unmap_aliases before vmalloc_init()

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Xen can end up calling vm_unmap_aliases() before vmalloc_init() has
been called.  In this case its safe to make it a simple no-op.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Linux Memory Management List <linux-mm@kvack.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-10-28 19:22:34 +11:00 committed by Ingo Molnar
parent 4bab0ea1d4
commit 9b46333406
1 changed files with 7 additions and 0 deletions
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7
mm/vmalloc.c
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@ -592,6 +592,8 @@ static void free_unmap_vmap_area_addr(unsigned long addr)
#define VMAP_BLOCK_SIZE (VMAP_BBMAP_BITS * PAGE_SIZE)
static bool vmap_initialized __read_mostly = false;
struct vmap_block_queue {
spinlock_t lock;
struct list_head free;
@ -828,6 +830,9 @@ void vm_unmap_aliases(void)
int cpu;
int flush = 0;
if (unlikely(!vmap_initialized))
return;
for_each_possible_cpu(cpu) {
struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
struct vmap_block *vb;
@ -942,6 +947,8 @@ void __init vmalloc_init(void)
INIT_LIST_HEAD(&vbq->dirty);
vbq->nr_dirty = 0;
}
vmap_initialized = true;
}
void unmap_kernel_range(unsigned long addr, unsigned long size)