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Date: Fri, 21 Nov 2014 16:05:03 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Pranith Kumar <bobby.prani@...il.com> Cc: Pablo Neira Ayuso <pablo@...filter.org>, Patrick McHardy <kaber@...sh.net>, Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>, "David S. Miller" <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, James Morris <jmorris@...ei.org>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, netfilter-devel@...r.kernel.org, coreteam@...filter.org, "open list:NETWORKING [IPv4/..." <netdev@...r.kernel.org>, open list <linux-kernel@...r.kernel.org> Subject: Re: [PATCH v2 9/9] netfilter: Replace smp_read_barrier_depends() with lockless_dereference() On Fri, 2014-11-21 at 16:57 -0500, Pranith Kumar wrote: > Hi Eric, > > Thanks for looking at this patch. > > I've been scratching my head since morning trying to find out what was > so obviously wrong with this patch. Alas, I don't see what you do. > > Could you point it out and show me how incompetent I am, please? > > Thanks! Well, even it the code is _not_ broken, I don't see any value with this patch. If I use git blame on current code, line containing smp_read_barrier_depends() exactly points to the relevant commit [1] After your change, it will point to some cleanup, which makes little sense to me, considering you did not change the smp_wmb() in xt_replace_table(). I, as a netfilter contributor would like to keep current code as is, because it is how I feel safe with it. We have a proliferation of interfaces, but this does not help to understand the issues and code maintenance. smp_read_barrier_depends() better documents the read barrier than lockless_dereference(). The point of having a lock or not is irrelevant here. [1] http://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=b416c144f46af1a30ddfa4e4319a8f077381ad63 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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