linux-kernel - Re: [PATCH][V2] net: dsa: mv88e6xxx: avoid unintended sign extension on a 16 bit shift

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Message-ID: <20180219173714.6frfl3nfq3gi4jsv@localhost>
Date:   Mon, 19 Feb 2018 09:37:14 -0800
From:   Richard Cochran <richardcochran@...il.com>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Colin King' <colin.king@...onical.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][V2] net: dsa: mv88e6xxx: avoid unintended sign extension
 on a 16 bit shift

On Mon, Feb 19, 2018 at 12:19:16PM +0000, David Laight wrote:
> This seems to be somewhat excessive 64bit maths on a 32bit system.
> It is more than enough to make timelo/timehi 'unsigned int'.

Do you see a difference in the generated code?

Thanks,
Richard