linux-kernel - Re: [PATCH net-next 01/17] net: Copy slab data for sendmsg(MSG_SPLICE

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Message-ID: <ZI26hJuixlQHOjk4@corigine.com>
Date:   Sat, 17 Jun 2023 15:52:04 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     David Howells <dhowells@...hat.com>
Cc:     netdev@...r.kernel.org,
        Alexander Duyck <alexander.duyck@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        David Ahern <dsahern@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Menglong Dong <imagedong@...cent.com>
Subject: Re: [PATCH net-next 01/17] net: Copy slab data for
 sendmsg(MSG_SPLICE_PAGES)

On Sat, Jun 17, 2023 at 07:43:15AM +0100, David Howells wrote:
> Simon Horman <simon.horman@...igine.com> wrote:
> 
> > > +	cache = get_cpu_ptr(&skb_splice_frag_cache);
> ...
> > > +	put_cpu_ptr(skb_splice_frag_cache);
> > 
> > Hi David,
> > 
> > I don't think it makes any difference at run-time.
> > But to keep Sparse happy, perhaps this ought to be put_cpu_var()
> 
> Actually, the problem is a missing "&".  I think I should use put_cpu_ptr() to
> match get_cpu_ptr().  It doesn't crash because the argument is ignored.

Thanks David, I agree that is a better idea.