On Tue, Jul 17, 2018 at 07:38:41PM -0700, Andrew Morton wrote: > On Thu, 12 Jul 2018 17:09:34 -0700 Omar Sandoval <osandov@xxxxxxxxxxx> wrote: > > > From: Omar Sandoval <osandov@xxxxxx> > > > > Now we only need kclist_lock from user context and at fs init time, and > > the following changes need to sleep while holding the kclist_lock. > > > > ... > > > > --- a/fs/proc/kcore.c > > +++ b/fs/proc/kcore.c > > @@ -59,8 +59,8 @@ struct memelfnote > > }; > > > > static LIST_HEAD(kclist_head); > > -static DEFINE_RWLOCK(kclist_lock); > > -static int kcore_need_update = 1; > > +static DECLARE_RWSEM(kclist_lock); > > +static atomic_t kcore_need_update = ATOMIC_INIT(1); > > It's unclear why kcore_need_update was changed to atomic_t - it's still > updated under kclist_lock? Not in the hotplug notifier (kcore_callback()) anymore, so I need the atomic_cmpxchg() in __kcore_update_ram(). That could use a mention in the commit message. > Maybe it's for a later patch. > >
