netdev - Re: [PATCH net-next 3/9] net: Remove e_nobufs label from ip_route_input

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Date:	Tue, 22 Sep 2015 21:04:53 -0600
From:	David Ahern <dsa@...ulusnetworks.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next 3/9] net: Remove e_nobufs label from
 ip_route_input_slow

On 9/22/15 8:15 PM, Eric W. Biederman wrote:
> David Ahern <dsa@...ulusnetworks.com> writes:
>
>> e_nobufs has 1 user. Move setting err to -ENOBUFS for the 1 user and
>> use the goto out label instead of e_nobufs. Stepping stone patch; next
>> one moves rth code into a helper function.
>
> Ick you are pessimizing the code.
>
> You will almost certainly have better code generation if you hoist
> the assignment of "err = -ENOBUFS" above the rt_dst_alloc then you
> don't need to do anything in your error path except "goto out;"

Can't do that here because the current value of err is used later in:
rth->dst.error = -err;

Besides, as mentioned above this is a stepping stone patch all of this 
is moved to a helper in patch 4. Where I could do the assignment before 
the rt_dst_alloc since I put the original err as an input arg rth_err.

David

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