netdev - Re: [patch] net/mlx4: && vs & typo

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Message-ID: <alpine.DEB.2.20.1703010746230.2079@hadrien>
Date:   Wed, 1 Mar 2017 07:52:01 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Bart Van Assche <Bart.VanAssche@...disk.com>
cc:     Joe Perches <joe@...ches.com>,
        "eugenia@...lanox.com" <eugenia@...lanox.com>,
        "dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
        "yishaih@...lanox.com" <yishaih@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [patch] net/mlx4: && vs & typo

On Tue, 28 Feb 2017, Bart Van Assche wrote:

> On 02/28/2017 02:23 PM, Joe Perches wrote:
> > On Tue, 2017-02-28 at 15:35 +0000, Bart Van Assche wrote:
> >> On Tue, 2017-02-28 at 15:02 +0300, Dan Carpenter wrote:
> >>> Bitwise & was obviously intended here.
> > []
> >>> diff --git a/include/linux/mlx4/driver.h b/include/linux/mlx4/driver.h
> > []
> >>> @@ -109,7 +109,7 @@ static inline void 	(u8 *addr, u64 mac)
> >>>  	int i;
> >>>
> >>>  	for (i = ETH_ALEN; i > 0; i--) {
> >>> -		addr[i - 1] = mac && 0xFF;
> >>> +		addr[i - 1] = mac & 0xFF;
> >>>  		mac >>= 8;
> >>>  	}
> >>>  }
> >>
> >> Is this the only place where such a loop occurs?
> >
> > Seems to be.
> >
> >> Should a put_unaligned_be48()
> >> function be introduced?
> >
> > Why?  This is used exactly once.
>
> Really? Here is an example of another open-coded version of
> put_unaligned_be48() from arch/mips/cavium-octeon/octeon-platform.c:
>
> 	new_mac[0] = (mac >> 40) & 0xff;
> 	new_mac[1] = (mac >> 32) & 0xff;
> 	new_mac[2] = (mac >> 24) & 0xff;
> 	new_mac[3] = (mac >> 16) & 0xff;
> 	new_mac[4] = (mac >> 8) & 0xff;
> 	new_mac[5] = mac & 0xff;

drivers/media/radio/radio-shark2.c:
        for (i = 0; i < 6; i++)
               shark->transfer_buffer[i + 1] = (reg >> (40 - i * 8)) & 0xff;

drivers/rtc/rtc-ab3100.c
       buf[0] = (hw_counter) & 0xFF;
       buf[1] = (hw_counter >> 8) & 0xFF;
       buf[2] = (hw_counter >> 16) & 0xFF;
       buf[3] = (hw_counter >> 24) & 0xFF;
       buf[4] = (hw_counter >> 32) & 0xFF;
       buf[5] = (hw_counter >> 40) & 0xFF;

drivers/net/ethernet/sun/ldmvsw.c
        for (i = 0; i < ETH_ALEN; i++)
               port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;

drivers/net/ethernet/sun/sunvnet.c
        for (i = 0; i < ETH_ALEN; i++)
               dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;

        for (i = 0; i < ETH_ALEN; i++)
               port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;

julia

>
> Bart.
> --
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