From: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx> Subject: ipc/util.h: update documentation for ipc_getref() and ipc_putref() Now that ipc_rcu_alloc() and ipc_rcu_free() are removed, document when it is valid to use ipc_getref() and ipc_putref(). Link: http://lkml.kernel.org/r/20170525185107.12869-21-manfred@xxxxxxxxxxxxxxxx Signed-off-by: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- ipc/util.h | 3 +++ 1 file changed, 3 insertions(+) diff -puN ipc/util.h~ipc-utilh-update-documentation-for-ipc_getref-and-ipc_putref ipc/util.h --- a/ipc/util.h~ipc-utilh-update-documentation-for-ipc_getref-and-ipc_putref +++ a/ipc/util.h @@ -112,6 +112,9 @@ int ipcperms(struct ipc_namespace *ns, s * 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, _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
