The patch titled
ipc namespace: initialize init_ipc_ns.count to 1
has been added to the -mm tree. Its filename is
namespaces-ipc-namespaces-implement-support-for-posix-msqueues-initialize-init_ipc_nscount-to-1.patch
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Subject: ipc namespace: initialize init_ipc_ns.count to 1
From: "Serge E. Hallyn" <serue@xxxxxxxxxx>
Hi Andrew,
when I sent an earlier version of the posix mqueue namespaces patchset
you called me on setting init_ipc_ns.count to 2. The following patch
changes that to 1. This is safe because the 1-count is for swapper, who
cannot unshare the namespace. Having init do unshare(CLONE_NEWIPC) only
drops the count to 1. No pre-init resources other than tasks pin (and
therefore can decrease the refcount on) an ipc_ns.
Signed-off-by: Serge E. Hallyn <serue@xxxxxxxxxx>
Cc: Cedric Le Goater <clg@xxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/msgutil.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff -puN ipc/msgutil.c~namespaces-ipc-namespaces-implement-support-for-posix-msqueues-initialize-init_ipc_nscount-to-1 ipc/msgutil.c
--- a/ipc/msgutil.c~namespaces-ipc-namespaces-implement-support-for-posix-msqueues-initialize-init_ipc_nscount-to-1
+++ a/ipc/msgutil.c
@@ -26,8 +26,7 @@ DEFINE_SPINLOCK(mq_lock);
* and not CONFIG_IPC_NS.
*/
struct ipc_namespace init_ipc_ns = {
- /* It's not for this patch to change, but should this be 1? */
- .count = ATOMIC_INIT(2),
+ .count = ATOMIC_INIT(1),
#ifdef CONFIG_POSIX_MQUEUE
.mq_queues_max = DFLT_QUEUESMAX,
.mq_msg_max = DFLT_MSGMAX,
_
Patches currently in -mm which might be from serue@xxxxxxxxxx are
linux-next.patch
vfs-simple_set_mnt-should-return-void.patch
relax-ns_can_attach-checks-to-allow-attaching-to-grandchild-cgroups.patch
proc_sysctl-use-config_proc_sysctl-around-ipc-and-utsname-proc_handlers.patch
pids-kill-now-unused-signal_struct-__pgrp-__session-and-friends.patch
namespaces-move-proc_net_get_sb-to-a-generic-fs-superc-helper.patch
namespaces-move-proc_net_get_sb-to-a-generic-fs-superc-helper-fix.patch
namespaces-mqueue-ns-move-mqueue_mnt-into-struct-ipc_namespace.patch
namespaces-ipc-namespaces-implement-support-for-posix-msqueues.patch
namespaces-ipc-namespaces-implement-support-for-posix-msqueues-initialize-init_ipc_nscount-to-1.patch
namespaces-mqueue-namespace-adapt-sysctl.patch
namespaces-mqueue-namespace-adapt-sysctl-update.patch
namespaces-mqueue-namespace-adapt-sysctl-update-fix.patch
reiser4.patch
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