netdev - Re: [PATCH] net: optimize cmpxchg in ip_idents

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Message-ID: <20200117183800.GA2649345@rani.riverdale.lan>
Date:   Fri, 17 Jan 2020 13:38:01 -0500
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Peter Zijlstra <peterz@...radead.org>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, jinyuqi@...wei.com,
        kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, edumazet@...gle.com,
        guoyang2@...wei.com, Will Deacon <will@...nel.org>
Subject: Re: [PATCH] net: optimize cmpxchg in ip_idents_reserve

On Fri, Jan 17, 2020 at 10:16:45AM -0800, Eric Dumazet wrote:
> Wasńt it the case back in 2016 already for linux-4.8 ?
> 
> What will prevent someone to send another report to netdev/lkml ?
> 
>  -fno-strict-overflow support is not a prereq for CONFIG_UBSAN.
> 
> Fact that we kept in lib/ubsan.c and lib/test_ubsan.c code for 
> test_ubsan_add_overflow() and test_ubsan_sub_overflow() is disturbing.
> 

No, it was bumped in 2018 in commit cafa0010cd51 ("Raise the minimum
required gcc version to 4.6"). That raised it from 3.2 -> 4.6.