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| author | alc <alc@FreeBSD.org> | 2003-12-22 02:04:08 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2003-12-22 02:04:08 +0000 |
| commit | dbc67551d35dfdec68a4408dde210754e6b1a2f3 (patch) | |
| tree | 9143bacb515682b4274ad6bed7255ccfee2e1b13 | |
| parent | eae1da31eade2f857fee00c87d25f65464147206 (diff) | |
| download | FreeBSD-src-dbc67551d35dfdec68a4408dde210754e6b1a2f3.zip FreeBSD-src-dbc67551d35dfdec68a4408dde210754e6b1a2f3.tar.gz | |
- Create an unmapped guard page to trap access to vm_page_array[-1].
This guard page would have trapped the problems with the MFC of the PAE
support to RELENG_4 at an earlier point in the sequence of events.
Submitted by: tegge
| -rw-r--r-- | sys/vm/vm_page.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c index 4015593..9290a6a 100644 --- a/sys/vm/vm_page.c +++ b/sys/vm/vm_page.c @@ -242,6 +242,11 @@ vm_page_startup(vm_offset_t starta, vm_offset_t enda, vm_offset_t vaddr) end = new_end; /* + * Reserve an unmapped guard page to trap access to vm_page_array[-1]. + */ + vaddr += PAGE_SIZE; + + /* * Initialize the mem entry structures now, and put them in the free * queue. */ |
