linux-kernel - Re: [PATCH v2 net-next 1/2] net: dsa: lan9303: Add port_fast_age and port_fdb

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Date:   Thu, 19 Oct 2017 16:51:11 +0200
From:   Egil Hjelmeland <privat@...l-hjelmeland.no>
To:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:     f.fainelli@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net-next 1/2] net: dsa: lan9303: Add port_fast_age and
 port_fdb_dump methods

On 19. okt. 2017 16:15, Andrew Lunn wrote:
>>> +/* Clear learned (non-static) entry on given port */
>>> +static void alr_loop_cb_del_port_learned(struct lan9303 *chip, u32 dat0,
>>> +					 u32 dat1, int portmap, void *ctx)
>>> +{
>>> +	int *port = ctx;
>>
>> You can get the value directly to make the line below more readable:
>>
>>      int port = *(int *)ctx;
> 
> You have to be a bit careful with this. You often see people
> submitting patches taking away casts for void * pointers.
> If they do that here, it should at least not compile...
> 
> So maybe do it in two steps?
> 
>     int * pport = ctx;
>     int port = *pport;
> 
> ???
> 	Andrew
> 

Without cast

    int port = *ctx;

... I can not compile. Neither arm-v5te-linux-gnueabi-gcc 4.7.2 or 
native 64bit gcc 6.3.0.

So I feel it is safe to do as Vivien suggest.

Egil