netdev - Re: [PATCH 29/38] cls_flower: Convert handle

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Message-ID: <20190821005015.GA18776@bombadil.infradead.org>
Date:   Tue, 20 Aug 2019 17:50:15 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH 29/38] cls_flower: Convert handle_idr to XArray

On Tue, Aug 20, 2019 at 04:58:34PM -0700, David Miller wrote:
> From: Matthew Wilcox <willy@...radead.org>
> Date: Tue, 20 Aug 2019 15:32:50 -0700
> 
> > -		idr_replace(&head->handle_idr, fnew, fnew->handle);
> > +		xa_store(&head->filters, fnew->handle, fnew, 0);
> 
> Passing a gfp_t of zero? :-)

Yes!  We know we'll never do an allocation here because we're replacing
an entry that already exists.  It wouldn't harm us to pass a real
GFP flag, so I'll probably just change that.  It might help a future
implementation, and it will definitely save confusion.