linux-kernel - Re: [PATCH v4 2/2] staging: android: Remove BUG from ion_system

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Message-ID: <20200824112457.GI1793@kadam>
Date:   Mon, 24 Aug 2020 14:24:57 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Tomer Samara <tomersamara98@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org, Todd Kjos <tkjos@...roid.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Riley Andrews <riandrews@...roid.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Hridya Valsaraju <hridya@...gle.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Laura Abbott <labbott@...hat.com>,
        Martijn Coenen <maco@...roid.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian Brauner <christian@...uner.io>
Subject: Re: [PATCH v4 2/2] staging: android: Remove BUG from
 ion_system_heap.c

On Fri, Aug 21, 2020 at 09:25:26AM -0700, Randy Dunlap wrote:
> On 8/21/20 8:28 AM, Tomer Samara wrote:
> > Remove BUG() from ion_sytem_heap.c
> > 
> > this fix the following checkpatch issue:
> > Avoid crashing the kernel - try using WARN_ON &
> > recovery code ratherthan BUG() or BUG_ON().
> > 
> > Signed-off-by: Tomer Samara <tomersamara98@...il.com>
> > ---
> >  drivers/staging/android/ion/ion_system_heap.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
> > index eac0632ab4e8..00d6154aec34 100644
> > --- a/drivers/staging/android/ion/ion_system_heap.c
> > +++ b/drivers/staging/android/ion/ion_system_heap.c
> > @@ -30,7 +30,7 @@ static int order_to_index(unsigned int order)
> >  	for (i = 0; i < NUM_ORDERS; i++)
> >  		if (order == orders[i])
> >  			return i;
> > -	BUG();
> > +	/* This is impossible. */
> >  	return -1;
> >  }
> 
> Hi,
> Please explain why this is impossible.
> 
> If some caller calls order_to_index(5), it will return -1, yes?
> 

I was happy enough with the comment as-is given that I suggested it.
But an alternative comment could be "/* This is impossible.
We always pass valid values to this function. */

regards,
dan carpenter