linux-kernel - Re: [PATCH] tcp_lp: use 64-bit arithmetic instead of 32-bit

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Message-Id: <20180201.094531.310132736141169083.davem@davemloft.net>
Date:   Thu, 01 Feb 2018 09:45:31 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     gustavo@...eddedor.com
Cc:     hswong3i@...il.com, hlhung3i@...il.com, kuznet@....inr.ac.ru,
        yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, garsilva@...eddedor.com
Subject: Re: [PATCH] tcp_lp: use 64-bit arithmetic instead of 32-bit

From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Date: Wed, 31 Jan 2018 18:24:07 -0600

> Cast to s64 some variables and a macro in order to give the
> compiler complete information about the proper arithmetic to
> use. Notice that these elements are used in contexts that
> expect expressions of type s64 (64 bits, signed).
> 
> Currently such expression are being evaluated using 32-bit
> arithmetic.
> 
> Addresses-Coverity-ID: 200687
> Addresses-Coverity-ID: 200688
> Addresses-Coverity-ID: 200689
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Sorry, I'm not applying this, the domain of the input values
means that the calculation cannot overflow.