Re: [PATCH 6/7] have ckpt_err set ctx->errno

[Oren Laadan <orenl-eQaUEPhvms7ENvBUuze7eA@public.gmane.org>]

serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org wrote:
> From: Serge E. Hallyn <serue-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
> 
> Move setting of ctx->errno into do_ckpt_msg().  We leave a small separate
> function to notify all restarting tasks in case of failure.  We use a
> CKPT_CTX_WOKEN bit for this.  If we always notify restarting tasks of
> failure inside do_ckpt_msg() then we will have to be more careful about
> when ckpt_err() is called at restart.  Only 4 instances were doing the

I don't think it is wrong to notify of errors and wakeup tasks
"too early" or multiple times. In fact, the first one to notify
an error (test-and-set of ctx->errno) should do that. What am I
missing ?

> wakeup right now (at the end of each possible restart sequence), and we
> don't want to risk moving notification too early.
> 
> This patch also fixes what should have been a problem before: always
> init_completion(&complete), else we might complete(&complete) on random junk

Nice catch.

[...]

Oren.