Messages in this thread Patch in this message | | | From | Manfred Spraul <> | Subject | [PATCH 20/20] ipc/util.h: Update documentation for ipc_getref() and ipc_putref() | Date | Thu, 25 May 2017 20:51:07 +0200 |
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Now that ipc_rcu_alloc() and ipc_rcu_free() are removed, document when it is valid to use ipc_getref() and ipc_putref().
Signed-off-by: Manfred Spraul <manfred@colorfullife.com> --- ipc/util.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/ipc/util.h b/ipc/util.h index 77336c2b..c692010 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -112,6 +112,9 @@ int ipcperms(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp, short flg); * Objects are reference counted, they start with reference count 1. * getref increases the refcount, the putref call that reduces the recount * to 0 schedules the rcu destruction. Caller must guarantee locking. + * + * refcount is initialized by ipc_addid(), before that point call_rcu() + * must be used. */ int ipc_rcu_getref(struct kern_ipc_perm *ptr); void ipc_rcu_putref(struct kern_ipc_perm *ptr, -- 2.9.3
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