linux-kernel - Re: [GIT] Networking

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Message-ID: <CA+55aFy6nC9tQFE_kRrF-YS9N7Jp18CnSxsLNcnAykNLyXQUtg@mail.gmail.com>
Date:	Mon, 2 Nov 2015 13:19:23 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	David Miller <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Network Development <netdev@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT] Networking

On Mon, Nov 2, 2015 at 1:16 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Mon, Nov 2, 2015 at 12:34 PM, Andy Lutomirski <luto@...nel.org> wrote:
>>
>> Getting overflow checking right in more complicated cases is a PITA.
>
> No it is not. Not for unsigned values.

Just to clarify. The "oevrflow" test for unsigned subtracts  of "a-b"
(it's really an underflow, but whatever) really is just

   (b > a)

Really. That's it. Claiming that that is "complicated" and needs a
helper function is not something sane people do. A fifth-grader that
isn't good at math can understand that.

In contrast, nobody sane understands "usub_overflow(a, b, &res)".

So really. Stop making inane arguments.

                  Linus
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