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| author | alc <alc@FreeBSD.org> | 2006-06-14 17:48:45 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2006-06-14 17:48:45 +0000 |
| commit | 455a07fa8e3591c228015821a421b20bd84e3645 (patch) | |
| tree | 2dff6c7d61b20fe878693932d132eef3a43a1ecf /sys/vm/vm_map.c | |
| parent | 12cf40a7a57241368306d308d0b32cf2f5899511 (diff) | |
| download | FreeBSD-src-455a07fa8e3591c228015821a421b20bd84e3645.zip FreeBSD-src-455a07fa8e3591c228015821a421b20bd84e3645.tar.gz | |
Correct an error in the previous revision that could lead to a panic:
Found mapped cache page. Specifically, if cnt.v_free_count dips below
cnt.v_free_reserved after p_start has been set to a non-NULL value,
then vm_map_pmap_enter() would break out of the loop and incorrectly
call pmap_enter_object() for the remaining address range. To correct
this error, this revision truncates the address range so that
pmap_enter_object() will not map any cache pages.
In collaboration with: tegge@
Reported by: kris@
Diffstat (limited to 'sys/vm/vm_map.c')
| -rw-r--r-- | sys/vm/vm_map.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 5fa5673..8305584 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -1489,6 +1489,7 @@ vm_map_pmap_enter(vm_map_t map, vm_offset_t addr, vm_prot_t prot, */ if ((flags & MAP_PREFAULT_MADVISE) && cnt.v_free_count < cnt.v_free_reserved) { + size = ptoa(tmpidx); break; } if ((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL && |
