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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2009-09-21 17:02:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:33 -0700 |
| commit | dd32c279983bf77fdcc8a9aa4a05b0ffdc75859c (patch) | |
| tree | 399737a47e6ab1b3a39f6f2950fec325421d082d /mm/vmalloc.c | |
| parent | 2f66a68f3fac2e94da360c342ff78ab45553f86c (diff) | |
| download | lwn-dd32c279983bf77fdcc8a9aa4a05b0ffdc75859c.tar.gz lwn-dd32c279983bf77fdcc8a9aa4a05b0ffdc75859c.zip | |
vmalloc: unmap vmalloc area after hiding it
vmap area should be purged after vm_struct is removed from the list
because vread/vwrite etc...believes the range is valid while it's on
vm_struct list.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Mike Smith <scgtrp@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmalloc.c')
| -rw-r--r-- | mm/vmalloc.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 759deae4539a..c4071fa8e12a 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1270,17 +1270,21 @@ struct vm_struct *remove_vm_area(const void *addr) 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; - + /* + * remove from list and disallow access to this vm_struct + * before unmap. (address range confliction is maintained by + * vmap.) + */ write_lock(&vmlist_lock); for (p = &vmlist; (tmp = *p) != vm; p = &tmp->next) ; *p = tmp->next; write_unlock(&vmlist_lock); + vmap_debug_free_range(va->va_start, va->va_end); + free_unmap_vmap_area(va); + vm->size -= PAGE_SIZE; + return vm; } return NULL; |