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From: Aleksandr Nogikh <a.nogikh@gmail.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: davem@davemloft.net, kuba@kernel.org,
	Eric Dumazet <edumazet@google.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Marco Elver <elver@google.com>,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	linux-wireless@vger.kernel.org, nogikh@google.com
Subject: Re: [PATCH 1/2] net: store KCOV remote handle in sk_buff
Date: Mon, 12 Oct 2020 13:10:05 +0300	[thread overview]
Message-ID: <CADpXja_PYfwBcigR-D9m7bsJg-fnPN921YeOrJJzYZTM3PftjQ@mail.gmail.com> (raw)
In-Reply-To: <c310818ecec06fe34d535bb61f3a50a1cf669f40.camel@sipsolutions.net>

On Mon, 12 Oct 2020 at 10:12, Johannes Berg <johannes@sipsolutions.net> wrote:
[...]
> > @@ -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
>

The field is added to the part of sk_buff that is between
headers_start and headers_end, therefore skb_copy will copy the field
to the newly created buffer. So in the case of copying it will be
initialized, and then overwritten. Probably, it's not the most
efficient way, but it seems to be the same for some other
fields that are initialized in __alloc_skb.

  reply	other threads:[~2020-10-12 10:10 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07 10:17 [PATCH 0/2] net, mac80211: enable KCOV remote coverage collection for 802.11 frame handling Aleksandr Nogikh
2020-10-07 10:17 ` [PATCH 1/2] net: store KCOV remote handle in sk_buff Aleksandr Nogikh
2020-10-09 23:15   ` Jakub Kicinski
2020-10-10  7:54     ` Dmitry Vyukov
2020-10-10 15:14       ` Jakub Kicinski
2020-10-12  6:04         ` Dmitry Vyukov
2020-10-13 15:59           ` Aleksandr Nogikh
2020-10-13 16:50             ` Jakub Kicinski
2020-10-15 19:04               ` Willem de Bruijn
2020-10-16 14:20                 ` Aleksandr Nogikh
2020-10-12  7:12   ` Johannes Berg
2020-10-12 10:10     ` Aleksandr Nogikh [this message]
2020-10-07 10:17 ` [PATCH 2/2] mac80211: add KCOV remote annotations to incoming frame processing Aleksandr Nogikh
2020-10-07 11:48 ` [PATCH 0/2] net, mac80211: enable KCOV remote coverage collection for 802.11 frame handling Johannes Berg
2020-10-07 14:40   ` Aleksandr Nogikh

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