netdev - Re: [PATCH 1/2] net: store KCOV remote handle in sk

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Message-ID: <c310818ecec06fe34d535bb61f3a50a1cf669f40.camel@sipsolutions.net>
Date:   Mon, 12 Oct 2020 09:12:13 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Aleksandr Nogikh <a.nogikh@...il.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     edumazet@...gle.com, andreyknvl@...gle.com, dvyukov@...gle.com,
        elver@...gle.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        nogikh@...gle.com
Subject: Re: [PATCH 1/2] net: store KCOV remote handle in sk_buff

On Wed, 2020-10-07 at 10:17 +0000, Aleksandr Nogikh wrote:
> 
> @@ -904,6 +905,10 @@ struct sk_buff {
>  	__u16			network_header;
>  	__u16			mac_header;
>  
> +#ifdef CONFIG_KCOV
> +	u64			kcov_handle;
> +#endif
[...] 

> @@ -233,6 +233,7 @@ struct sk_buff *__alloc_skb(unsigned int size, gfp_t gfp_mask,
>  	skb->end = skb->tail + size;
>  	skb->mac_header = (typeof(skb->mac_header))~0U;
>  	skb->transport_header = (typeof(skb->transport_header))~0U;
> +	skb_set_kcov_handle(skb, kcov_common_handle());

Btw, you're only setting this here. It seems to me it would make sense
to copy it when the skb is copied, rather than then having it set to the
kcov handle of the (interrupted) task that was copying the skb?

johannes