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Date: Thu, 1 Feb 2018 00:32:36 +0000 From: Alan Cox <gnomes@...rguk.ukuu.org.uk> To: "Gustavo A. R. Silva" <gustavo@...eddedor.com> Cc: "Wong Hoi Sing, Edison" <hswong3i@...il.com>, "Hung Hing Lun, Mike" <hlhung3i@...il.com>, "David S. Miller" <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, "Gustavo A. R. Silva" <garsilva@...eddedor.com> Subject: Re: [PATCH] tcp_lp: use 64-bit arithmetic instead of 32-bit On Wed, 31 Jan 2018 18:24:07 -0600 "Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote: > 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. The question you need to ask is 'can it overflow 32bit maths', otherwise you are potentially making the system do extra work for no reason. Alan
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