linux-kernel - Re: [Intel-wired-lan] [PATCH net-next v4 1/2] ice: Don't use %pK through printk or tracepoints

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Message-ID: <7ae9f1ad-0882-4c33-9979-fafb03f7de18@molgen.mpg.de>
Date: Fri, 18 Jul 2025 15:41:39 +0200
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Tony Nguyen <anthony.l.nguyen@...el.com>,
 Przemek Kitszel <przemyslaw.kitszel@...el.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>,
 Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
 intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
 Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
 Simon Horman <horms@...nel.org>
Subject: Re: [Intel-wired-lan] [PATCH net-next v4 1/2] ice: Don't use %pK
 through printk or tracepoints

Dear Thomas,


Thank you for the patch.

Am 18.07.25 um 15:23 schrieb Thomas Weißschuh:
> In the past %pK was preferable to %p as it would not leak raw pointer
> values into the kernel log.
> Since commit ad67b74d2469 ("printk: hash addresses printed with %p")
> the regular %p has been improved to avoid this issue.
> Furthermore, restricted pointers ("%pK") were never meant to be used
> through printk(). They can still unintentionally leak raw pointers or
> acquire sleeping locks in atomic contexts.
> 
> Switch to the regular pointer formatting which is safer and
> easier to reason about.
> There are still a few users of %pK left, but these use it through seq_file,
> for which its usage is safe.

The line length are a little uneven.

> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
> Acked-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> Reviewed-by: Simon Horman <horms@...nel.org>
> ---
>   drivers/net/ethernet/intel/ice/ice_main.c  |  2 +-
>   drivers/net/ethernet/intel/ice/ice_trace.h | 10 +++++-----
>   2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
> index af68869693edf6004e70caa4e952794439d800ab..76d67b39a0c1af02293ef2df06a6735b46c6679f 100644
> --- a/drivers/net/ethernet/intel/ice/ice_main.c
> +++ b/drivers/net/ethernet/intel/ice/ice_main.c
> @@ -9153,7 +9153,7 @@ static int ice_create_q_channels(struct ice_vsi *vsi)
>   		list_add_tail(&ch->list, &vsi->ch_list);
>   		vsi->tc_map_vsi[i] = ch->ch_vsi;
>   		dev_dbg(ice_pf_to_dev(pf),
> -			"successfully created channel: VSI %pK\n", ch->ch_vsi);
> +			"successfully created channel: VSI %p\n", ch->ch_vsi);
>   	}
>   	return 0;
>   
> diff --git a/drivers/net/ethernet/intel/ice/ice_trace.h b/drivers/net/ethernet/intel/ice/ice_trace.h
> index 07aab6e130cd553fa1fcaa2feac9d14f0433239a..4f35ef8d6b299b4acd6c85992c2c93b164a88372 100644
> --- a/drivers/net/ethernet/intel/ice/ice_trace.h
> +++ b/drivers/net/ethernet/intel/ice/ice_trace.h
> @@ -130,7 +130,7 @@ DECLARE_EVENT_CLASS(ice_tx_template,
>   				   __entry->buf = buf;
>   				   __assign_str(devname);),
>   
> -		    TP_printk("netdev: %s ring: %pK desc: %pK buf %pK", __get_str(devname),
> +		    TP_printk("netdev: %s ring: %p desc: %p buf %p", __get_str(devname),
>   			      __entry->ring, __entry->desc, __entry->buf)
>   );
>   
> @@ -158,7 +158,7 @@ DECLARE_EVENT_CLASS(ice_rx_template,
>   				   __entry->desc = desc;
>   				   __assign_str(devname);),
>   
> -		    TP_printk("netdev: %s ring: %pK desc: %pK", __get_str(devname),
> +		    TP_printk("netdev: %s ring: %p desc: %p", __get_str(devname),
>   			      __entry->ring, __entry->desc)
>   );
>   DEFINE_EVENT(ice_rx_template, ice_clean_rx_irq,
> @@ -182,7 +182,7 @@ DECLARE_EVENT_CLASS(ice_rx_indicate_template,
>   				   __entry->skb = skb;
>   				   __assign_str(devname);),
>   
> -		    TP_printk("netdev: %s ring: %pK desc: %pK skb %pK", __get_str(devname),
> +		    TP_printk("netdev: %s ring: %p desc: %p skb %p", __get_str(devname),
>   			      __entry->ring, __entry->desc, __entry->skb)
>   );
>   
> @@ -205,7 +205,7 @@ DECLARE_EVENT_CLASS(ice_xmit_template,
>   				   __entry->skb = skb;
>   				   __assign_str(devname);),
>   
> -		    TP_printk("netdev: %s skb: %pK ring: %pK", __get_str(devname),
> +		    TP_printk("netdev: %s skb: %p ring: %p", __get_str(devname),
>   			      __entry->skb, __entry->ring)
>   );
>   
> @@ -228,7 +228,7 @@ DECLARE_EVENT_CLASS(ice_tx_tstamp_template,
>   		    TP_fast_assign(__entry->skb = skb;
>   				   __entry->idx = idx;),
>   
> -		    TP_printk("skb %pK idx %d",
> +		    TP_printk("skb %p idx %d",
>   			      __entry->skb, __entry->idx)
>   );
>   #define DEFINE_TX_TSTAMP_OP_EVENT(name) \

Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>


Kind regards,

Paul