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| author | Konstantin Belousov <kib@FreeBSD.org> | 2008-09-12 09:53:29 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2008-09-12 09:53:29 +0000 |
| commit | 9719da13e74fefffb3f4a298dd63dae2ebd1bee3 (patch) | |
| tree | 928284f471409dceb4fede36aa66ab053e0d40f9 /sys/i386/i386/sys_machdep.c | |
| parent | cb1d78d09abae4fdf8b868b81ea5dc11def5acaa (diff) | |
| download | src-9719da13e74fefffb3f4a298dd63dae2ebd1bee3.tar.gz src-9719da13e74fefffb3f4a298dd63dae2ebd1bee3.zip | |
When doing rfork(0), i.e. separating curproc VM from any other user of
the same vmspace, decrement the reference count of the shared LDT instead
of a newly-made copy. Code factually removed LDT from the process that
did rfork(0).
Introduce user_ldt_deref() function that does decrement of refcount for
the struct proc_ldt, and call it in the rfork(0) case on the shared LDT.
Reviewed by: jhb
MFC after: 1 week
Notes
Notes:
svn path=/head/; revision=182961
Diffstat (limited to 'sys/i386/i386/sys_machdep.c')
| -rw-r--r-- | sys/i386/i386/sys_machdep.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sys/i386/i386/sys_machdep.c b/sys/i386/i386/sys_machdep.c index f6aca9cd7497..7619db7c22da 100644 --- a/sys/i386/i386/sys_machdep.c +++ b/sys/i386/i386/sys_machdep.c @@ -526,6 +526,14 @@ user_ldt_free(struct thread *td) } mdp->md_ldt = NULL; + user_ldt_deref(pldt); +} + +void +user_ldt_deref(struct proc_ldt *pldt) +{ + + mtx_assert(&dt_lock, MA_OWNED); if (--pldt->ldt_refcnt == 0) { mtx_unlock_spin(&dt_lock); kmem_free(kernel_map, (vm_offset_t)pldt->ldt_base, |