linux-kernel - Re: [PATCH v2 2/6] can: dev: add a helper function

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Message-Id: <20201001154531.3217-1-mailhol.vincent@wanadoo.fr>
Date:   Fri,  2 Oct 2020 00:45:31 +0900
From:   Vincent Mailhol <mailhol.vincent@...adoo.fr>
To:     Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-can@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Jakub Kicinski <kuba@...nel.org>,
        Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arunachalam Santhanam <arunachalam.santhanam@...bosch.com>
Subject: Re: [PATCH v2 2/6] can: dev: add a helper function

> > +static inline int get_can_len(struct sk_buff *skb)
> 
> make this return an u8
> make the skb const
> 
> > +{
> > +	struct canfd_frame *cf =3D (struct canfd_frame *)skb->data;
> 
> const
> 
> > +
> > +	if (can_is_canfd_skb(skb))
> > +		return min_t(__u8, cf->len, CANFD_MAX_DLEN);
> 
> u8
> 
> > +	else if (cf->can_id & CAN_RTR_FLAG)
> > +		return 0;
> > +	else
> > +		return min_t(__u8, cf->len, CAN_MAX_DLEN);
> 
> u8

Noted. All those changes will be addressed in v3 series.
Thank you.

As a side note, macros get_can_dlc() and get_canfd_dlc of the same
file (include/linux/can/dev.h) also use __u8 instead of u8. Do you
want me to add a patch to change these as below?

 /*
  * get_can_dlc(value) - helper macro to cast a given data length code (dlc)
- * to __u8 and ensure the dlc value to be max. 8 bytes.
+ * to u8 and ensure the dlc value to be max. 8 bytes.
  *
  * To be used in the CAN netdriver receive path to ensure conformance with
  * ISO 11898-1 Chapter 8.4.2.3 (DLC field)
  */
-#define get_can_dlc(i)         (min_t(__u8, (i), CAN_MAX_DLC))
-#define get_canfd_dlc(i)       (min_t(__u8, (i), CANFD_MAX_DLC))
+#define get_can_dlc(i)         (min_t(u8, (i), CAN_MAX_DLC))
+#define get_canfd_dlc(i)       (min_t(u8, (i), CANFD_MAX_DLC))
 
 /* Check for outgoing skbs that have not been created by the CAN subsystem */
 static inline bool can_skb_headroom_valid(struct net_device *dev,