diff options
| author |   mts <mts@openbsd.org> | 2001-07-17 10:31:08 +0000 |
|---|---|---|
| committer | mts <mts@openbsd.org> | 2001-07-17 10:31:08 +0000 |
| commit | 15b329e87ee05b48b92702e13f66f814fe47ea28 (patch) | |
| tree | 629a67d9874da21f3956cb2399dbcdcf79840c2f | |
| parent | I2O is supported too (diff) | |
| download | wireguard-openbsd-15b329e87ee05b48b92702e13f66f814fe47ea28.tar.xz wireguard-openbsd-15b329e87ee05b48b92702e13f66f814fe47ea28.zip | |
current netbsd's uvm_map uses a 3-parm SAVE_HINT to perform a test/swap
under locked conditions. we currently use a 2-parm SAVE_HINT... to meet
the same functionality, we instead need to validate the hint is the one
CURRENTLY in the map before substituing it, and we need to do that while
the lock is retained.
| -rw-r--r-- | sys/uvm/uvm_map.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/uvm/uvm_map.c b/sys/uvm/uvm_map.c index 7a817b82903..07365816ab7 100644 --- a/sys/uvm/uvm_map.c +++ b/sys/uvm/uvm_map.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_map.c,v 1.17 2001/07/11 13:57:54 mts Exp $ */ +/* $OpenBSD: uvm_map.c,v 1.18 2001/07/17 10:31:08 mts Exp $ */ /* $NetBSD: uvm_map.c,v 1.68 1999/08/21 02:19:05 thorpej Exp $ */ /* @@ -1059,7 +1059,11 @@ uvm_unmap_remove(map, start, end, entry_list) UVMHIST_LOG(maphist, " removed map entry 0x%x", entry, 0, 0,0); /* critical! prevents stale hint */ - SAVE_HINT(map, entry->prev); + /* XXX: need SAVE_HINT with three parms */ + simple_lock(map->hint_lock); + if (map->hint == entry) + map->hint = entry->prev; + simple_unlock(map->hint_lock); uvm_map_entry_unlink(map, entry); map->size -= len; |