On Tue, Sep 18, 2007 at 03:27:27AM -0700, Andrew Morton wrote:
> On Tue, 18 Sep 2007 13:17:28 +0400 Alexey Dobriyan <[email protected]> wrote:
>
> > I'm getting tons of this, and X fails to start
> >
> > CONFIG_SYSVIPC=y
> > CONFIG_SYSVIPC_SYSCTL=y
> > # CONFIG_PREEMPT_NONE is not set
> > # CONFIG_PREEMPT_VOLUNTARY is not set
> > CONFIG_PREEMPT=y
> > CONFIG_PREEMPT_BKL=y
> > CONFIG_DEBUG_PREEMPT=y
> >
> > BUG: sleeping function called from invalid context at kernel/rwsem.c:47
> > in_atomic():1, irqs_disabled():0
>
> OK, this fixes the locking here:
Ditto. Thanks!
[puts mental note to read IPC patches]
> --- a/ipc/util.c~ipc-integrate-ipc_checkid-into-ipc_lock-fix-2
> +++ a/ipc/util.c
> @@ -295,7 +295,6 @@ int ipc_addid(struct ipc_ids* ids, struc
>
> spin_lock_init(&new->lock);
> new->deleted = 0;
> - rcu_read_lock();
> spin_lock(&new->lock);
> return id;
> }
> @@ -691,7 +690,7 @@ struct kern_ipc_perm *ipc_lock(struct ip
> rcu_read_unlock();
> return ERR_PTR(-EINVAL);
> }
> -
> + rcu_read_unlock();
> return out;
> }
-
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