diff options
| author | jhb <jhb@FreeBSD.org> | 2010-10-21 17:29:32 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2010-10-21 17:29:32 +0000 |
| commit | 2d6ab8853a286164be8e70da0268b3599ccaa0d3 (patch) | |
| tree | cf57ca3486d101a83bf6249dd02ff5ba997700e7 /sys/vm/vm_map.h | |
| parent | 24f2e3e95977a97fcfdb49f610bab77d3e6fceb9 (diff) | |
| download | FreeBSD-src-2d6ab8853a286164be8e70da0268b3599ccaa0d3.zip FreeBSD-src-2d6ab8853a286164be8e70da0268b3599ccaa0d3.tar.gz | |
- Make 'vm_refcnt' volatile so that compilers won't be tempted to treat
its value as a loop invariant. Currently this is a no-op because
'atomic_cmpset_int()' clobbers all memory on current architectures.
- Use atomic_fetchadd_int() instead of an atomic_cmpset_int() loop to drop
a reference in vmspace_free().
Reviewed by: alc
MFC after: 1 month
Diffstat (limited to 'sys/vm/vm_map.h')
| -rw-r--r-- | sys/vm/vm_map.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/vm/vm_map.h b/sys/vm/vm_map.h index 18a1edf..8715b41 100644 --- a/sys/vm/vm_map.h +++ b/sys/vm/vm_map.h @@ -236,7 +236,7 @@ struct vmspace { caddr_t vm_taddr; /* (c) user virtual address of text */ caddr_t vm_daddr; /* (c) user virtual address of data */ caddr_t vm_maxsaddr; /* user VA at max stack growth */ - int vm_refcnt; /* number of references */ + volatile int vm_refcnt; /* number of references */ /* * Keep the PMAP last, so that CPU-specific variations of that * structure on a single architecture don't result in offset |
