linux-kernel - Re: [PATCH] tcp: don't use __constant_cpu_to

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Message-ID: <CANn89iJMFfh1Pkvk9LOn3FwgAfpVjwS7q5x_8Y9zo2rzpy7w9g@mail.gmail.com>
Date:   Thu, 14 Mar 2019 05:42:02 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH] tcp: don't use __constant_cpu_to_be32

On Wed, Mar 13, 2019 at 11:15 PM Sergey Senozhatsky
<sergey.senozhatsky.work@...il.com> wrote:
>
> A trivial patch.


Not so trivial...


>
>
> cpu_to_be32() is capable enough to detect __builtin_constant_p()
> and to use an appropriate compile time ___constant_swahb32()
> function.
>
> So we can use cpu_to_be32() instead of __constant_cpu_to_be32().


I dunno, this is uapi, this might break user space for some funky compiler ?

I do not even know if cpu_to_be32() _is_ uapi.