netdev - Re: [PATCH] Revert "net: get rid of an signed integer overflow in ip_idents

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Date:   Fri, 26 Jul 2019 11:58:29 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Shaokun Zhang <zhangshaokun@...ilicon.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Yang Guo <guoyang2@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH] Revert "net: get rid of an signed integer overflow in
 ip_idents_reserve()"



On 7/26/19 11:17 AM, Shaokun Zhang wrote:
> From: Yang Guo <guoyang2@...wei.com>
> 
> There is an significant performance regression with the following
> commit-id <adb03115f459>
> ("net: get rid of an signed integer overflow in ip_idents_reserve()").
> 
>

So, you jump around and took ownership of this issue, while some of us
are already working on it ?

Have you first checked that current UBSAN versions will not complain anymore ?

A revert adding back the original issue would be silly, performance of
benchmarks is nice but secondary.