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

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Message-ID: <20180215202757.GB3080@lunn.ch>
Date:   Thu, 15 Feb 2018 21:27:57 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     richardcochran@...il.com
Cc:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] net: dsa: mv88e6xxx: avoid unintended sign
 extension on a 16 bit shift

> diff --git a/drivers/net/dsa/mv88e6xxx/hwtstamp.c b/drivers/net/dsa/mv88e6xxx/hwtstamp.c
> index b251d534b70d..758e35fa69ab 100644
> --- a/drivers/net/dsa/mv88e6xxx/hwtstamp.c
> +++ b/drivers/net/dsa/mv88e6xxx/hwtstamp.c
> @@ -321,7 +321,7 @@ static void mv88e6xxx_get_rxts(struct mv88e6xxx_chip *chip,
>  	 */
>  	for ( ; skb; skb = skb_dequeue(rxq)) {
>  		if (mv88e6xxx_ts_valid(status) && seq_match(skb, seq_id)) {
> -			u64 ns = timehi << 16 | timelo;
> +			u64 ns = (u64)timehi << 16 | timelo;

Hi Richard

Do you prefer this, or making timehi and timelo a u64?

   Andrew