netdev - Re: [PATCH net-next v3] net: remove noblock parameter from skb_recv

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Date:   Tue, 22 Mar 2022 11:41:57 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Oliver Hartkopp <socketcan@...tkopp.net>
Cc:     netdev@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH net-next v3] net: remove noblock parameter from
 skb_recv_datagram()

On Tue, 22 Mar 2022 09:03:17 +0100 Oliver Hartkopp wrote:
> skb_recv_datagram() has two parameters 'flags' and 'noblock' that are
> merged inside skb_recv_datagram() by 'flags | (noblock ? MSG_DONTWAIT : 0)'
> 
> As 'flags' may contain MSG_DONTWAIT as value most callers split the 'flags'
> into 'flags' and 'noblock' with finally obsolete bit operations like this:
> 
> skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, flags & MSG_DONTWAIT, &rc);
> 
> And this is not even done consistently with the 'flags' parameter.
> 
> This patch removes the obsolete and costly splitting into two parameters
> and only performs bit operations when really needed on the caller side.
> 
> One missing conversion thankfully reported by kernel test robot. I missed
> to enable kunit tests to build the mctp code.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Oliver Hartkopp <socketcan@...tkopp.net>

Would it be a major inconvenience if I asked you to come back with this
patch after the merge window? We were hoping to keep net-next closed
for the time being. No new features should go in in the meantime so it's
unlikely the patch itself would break.