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authorJeremy Fitzhardinge <jeremy@goop.org>2008-10-28 19:22:34 +1100
committerIngo Molnar <mingo@elte.hu>2008-11-07 10:05:59 +0100
commit9b46333406b9cb3397ab538485a4d57c316af0ff (patch)
tree02c347d86d128b21b3138cb56c7c544bc4e1b930 /mm
parent4bab0ea1d42dd1927af9df6fbf0003fc00617c50 (diff)
downloadlinux-2.6.34-ux500-9b46333406b9cb3397ab538485a4d57c316af0ff.tar.gz
vmap: cope with vm_unmap_aliases before vmalloc_init()
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmalloc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 66fad3fc02b..ba6b0f5f7fa 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -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)