linux-kernel - Re: [PATCH v2 05/10] blktrace: upgrade warns to BUG

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Message-ID: <20200419230730.GH11244@42.do-not-panic.com>
Date:   Sun, 19 Apr 2020 23:07:30 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     axboe@...nel.dk, viro@...iv.linux.org.uk,
        gregkh@...uxfoundation.org, rostedt@...dmis.org, mingo@...hat.com,
        jack@...e.cz, ming.lei@...hat.com, nstange@...e.de,
        akpm@...ux-foundation.org, mhocko@...e.com, yukuai3@...wei.com,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 05/10] blktrace: upgrade warns to BUG_ON() on
 unexpected circmunstances

On Sun, Apr 19, 2020 at 03:50:13PM -0700, Bart Van Assche wrote:
> On 4/19/20 12:45 PM, Luis Chamberlain wrote:
> > @@ -498,10 +498,7 @@ static struct dentry *blk_trace_debugfs_dir(struct blk_user_trace_setup *buts,
> >   	struct dentry *dir = NULL;
> >   	/* This can only happen if we have a bug on our lower layers */
> > -	if (!q->kobj.parent) {
> > -		pr_warn("%s: request_queue parent is gone\n", buts->name);
> > -		return NULL;
> > -	}
> > +	BUG_ON(!q->kobj.parent);
> 
> Does the following quote from Linus also apply to this patch: "there is NO
> F*CKING EXCUSE to knowingly kill the kernel." See also
> https://lkml.org/lkml/2016/10/4/1.

We can use WARN_ON() and keep the return NULL, sure.

  Luis