Re: [PATCH net] tcp: ensure proper barriers in lockless contexts

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From: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx>
Date: Mon, 16 Nov 2015 20:45:25 -0500

> Just a heads up that this breaks all arm64 builds in linux-next from
> Monday; bisect says:
> 
> 00fd38d938db3f1ab1c486549afc450cb7e751b1 is the first bad commit
> commit 00fd38d938db3f1ab1c486549afc450cb7e751b1
> Author: Eric Dumazet
> <edumazet@xxxxxxxxxx>http://kisskb.ellerman.id.au/kisskb/buildresult/12548450/
> Date:   Thu Nov 12 08:43:18 2015 -0800
> 
>     tcp: ensure proper barriers in lockless contexts
> 
> Here is one of the linux-next fails:
> 
> http://kisskb.ellerman.id.au/kisskb/buildresult/12548450/

Thanks for the report Paul.

I think Eric's patch is correct.  I see what ARM is trying to do here,
but it really has to accomodate const arguments to smp_load_acquire().
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