From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: paulmck@kernel.org
Cc: Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>,
Hangbin Liu <liuhangbin@gmail.com>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Magnus Karlsson <magnus.karlsson@gmail.com>,
Jakub Kicinski <kuba@kernel.org>,
bpf@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH bpf-next v3 03/16] xdp: add proper __rcu annotations to redirect map entries
Date: Wed, 23 Jun 2021 12:55:55 +0200 [thread overview]
Message-ID: <87eecsonno.fsf@toke.dk> (raw)
In-Reply-To: <20210622231950.GK4397@paulmck-ThinkPad-P17-Gen-1>
"Paul E. McKenney" <paulmck@kernel.org> writes:
> On Tue, Jun 22, 2021 at 11:48:26PM +0200, Toke Høiland-Jørgensen wrote:
>> "Paul E. McKenney" <paulmck@kernel.org> writes:
>>
>> > On Tue, Jun 22, 2021 at 03:55:25PM +0200, Toke Høiland-Jørgensen wrote:
>> >> Toke Høiland-Jørgensen <toke@redhat.com> writes:
>> >>
>> >> >> It would also be great if this scenario in general could be placed
>> >> >> under the Documentation/RCU/whatisRCU.rst as an example, so we could
>> >> >> refer to the official doc on this, too, if Paul is good with this.
>> >> >
>> >> > I'll take a look and see if I can find a way to fit it in there...
>> >>
>> >> OK, I poked around in Documentation/RCU and decided that the most
>> >> natural place to put this was in checklist.rst which already talks about
>> >> local_bh_disable(), but a bit differently. Fixing that up to correspond
>> >> to what we've been discussing in this thread, and adding a mention of
>> >> XDP as a usage example, results in the patch below.
>> >>
>> >> Paul, WDYT?
>> >
>> > I think that my original paragraph needed to have been updated back
>> > when v4.20 came out. And again when RCU Tasks Trace came out. ;-)
>> >
>> > So I did that updating, then approximated your patch on top of it,
>> > as shown below. Does this work for you?
>>
>> Yup, LGTM, thanks! Shall I just fold that version into the next version
>> of my series, or do you want to take it through your tree (I suppose
>> it's independent of the rest, so either way is fine by me)?
>
> I currently have the two here in -rcu, most likely for v5.15 (as in
> the merge window after the upcoming one):
>
> 2b7cb9d95ba4 ("doc: Clarify and expand RCU updaters and corresponding readers")
> c6ef58907d22 ("doc: Give XDP as example of non-obvious RCU reader/updater pairing")
>
> I am happy taking it, but if you really would like to add it to your
> series, please do take both. ;-)
Alright, I'll fold both in to v4 :)
-Toke
next prev parent reply other threads:[~2021-06-23 10:56 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 21:27 [PATCH bpf-next v3 00/16] Clean up and document RCU-based object protection for XDP_REDIRECT Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 01/16] rcu: Create an unrcu_pointer() to remove __rcu from a pointer Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 02/16] bpf: allow RCU-protected lookups to happen from bh context Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 03/16] xdp: add proper __rcu annotations to redirect map entries Toke Høiland-Jørgensen
2021-06-18 4:55 ` Martin KaFai Lau
2021-06-18 23:27 ` Daniel Borkmann
2021-06-21 21:39 ` Toke Høiland-Jørgensen
2021-06-21 22:15 ` Daniel Borkmann
2021-06-21 22:35 ` Toke Høiland-Jørgensen
2021-06-22 8:50 ` Daniel Borkmann
2021-06-22 13:55 ` Toke Høiland-Jørgensen
2021-06-22 20:26 ` Paul E. McKenney
2021-06-22 21:48 ` Toke Høiland-Jørgensen
2021-06-22 23:19 ` Paul E. McKenney
2021-06-23 10:55 ` Toke Høiland-Jørgensen [this message]
2021-06-17 21:27 ` [PATCH bpf-next v3 04/16] ena: remove rcu_read_lock() around XDP program invocation Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 05/16] bnxt: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 06/16] thunderx: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 07/16] freescale: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 08/16] net: intel: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 09/16] marvell: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 10/16] mlx4: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 11/16] nfp: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 12/16] qede: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 13/16] sfc: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 14/16] netsec: " Toke Høiland-Jørgensen
2021-06-17 21:27 ` [PATCH bpf-next v3 15/16] stmmac: " Toke Høiland-Jørgensen
2021-06-18 9:47 ` Wong Vee Khee
2021-06-17 21:27 ` [PATCH bpf-next v3 16/16] net: ti: " Toke Høiland-Jørgensen
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