linux-kernel - Re: [PATCH] exit.c: Fix Sparse errors and warnings

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Date:   Wed, 29 Jan 2020 21:32:04 +0530
From:   Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
To:     Oleg Nesterov <oleg@...hat.com>
Cc:     madhuparnabhowmik10@...il.com, peterz@...radead.org,
        mingo@...nel.org, christian.brauner@...ntu.com, paulmck@...nel.org,
        linux-kernel@...r.kernel.org, joel@...lfernandes.org,
        linux-kernel-mentees@...ts.linuxfoundation.org, rcu@...r.kernel.org
Subject: Re: [PATCH] exit.c: Fix Sparse errors and warnings

On Wed, Jan 29, 2020 at 01:30:47PM +0100, Oleg Nesterov wrote:
> On 01/28, madhuparnabhowmik10@...il.com wrote:
> >
> > kernel/exit.c:626:40: warning: incorrect type in assignment
> > 
> > Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@...il.com>
> > ---
> >  kernel/exit.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/exit.c b/kernel/exit.c
> > index bcbd59888e67..c5a9d6360440 100644
> > --- a/kernel/exit.c
> > +++ b/kernel/exit.c
> > @@ -623,8 +623,8 @@ static void forget_original_parent(struct task_struct *father,
> >  	reaper = find_new_reaper(father, reaper);
> >  	list_for_each_entry(p, &father->children, sibling) {
> >  		for_each_thread(p, t) {
> > -			t->real_parent = reaper;
> > -			BUG_ON((!t->ptrace) != (t->parent == father));
> > +			rcu_assign_pointer(t->real_parent, reaper);
> 
> Another case when RCU_INIT_POINTER() makes more sense (although to me it
> too looks confusing). We didn't modify the new parent.
>
Alright, I will resend this patch with RCU_INIT_POINTER().

Thank you,
Madhuparna

> Oleg.
>