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Date: Tue, 23 Dec 2025 02:38:05 +0000
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From: "Jiayuan Chen" <jiayuan.chen@linux.dev>
Message-ID: <7f7c32e627e7d0fd1be12865f253a67cd3af29a8@linux.dev>
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Subject: Re: [PATCH net v2] ipv6: fix a BUG in rt6_get_pcpu_route() under
 PREEMPT_RT
To: "Steven Rostedt" <rostedt@goodmis.org>, "Eric Dumazet"
 <edumazet@google.com>
Cc: netdev@vger.kernel.org,
 syzbot+9b35e9bc0951140d13e6@syzkaller.appspotmail.com, "David S. Miller"
 <davem@davemloft.net>, "David Ahern" <dsahern@kernel.org>, "Jakub
 Kicinski" <kuba@kernel.org>, "Paolo Abeni" <pabeni@redhat.com>, "Simon
 Horman" <horms@kernel.org>, "Sebastian Andrzej Siewior"
 <bigeasy@linutronix.de>, "Clark Williams" <clrkwllms@kernel.org>,
 linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev
In-Reply-To: <20251222122628.38e9bc89@gandalf.local.home>
References: <20251219025140.77695-1-jiayuan.chen@linux.dev>
 <CANn89iLeASUZyonYSLX0AG5mbC=gxux0efehkBc_j1bbj6xrvA@mail.gmail.com>
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December 23, 2025 at 01:26, "Steven Rostedt" <rostedt@goodmis.org mailto:=
rostedt@goodmis.org?to=3D%22Steven%20Rostedt%22%20%3Crostedt%40goodmis.or=
g%3E > wrote:


>=20
>=20On Mon, 22 Dec 2025 12:16:39 -0500
> Steven Rostedt <rostedt@goodmis.org> wrote:
>=20
>=20>=20
>=20> On Mon, 22 Dec 2025 09:50:58 +0100
> >  Eric Dumazet <edumazet@google.com> wrote:
> >=20=20
>=20>  > Link: https://syzkaller.appspot.com/bug?extid=3D9b35e9bc0951140d=
13e6
> >  > Fixes: 951f788a80ff ("ipv6: fix a BUG in rt6_get_pcpu_route()")=20
>=20>=20=20
>=20>  I would rather find when PREEMPT_RT was added/enabled, there is no
> >  point blaming such an old commit
> >  which was correct at the time, and forcing pointless backports to ol=
d
> >  linux kernels.=20
>=20>=20=20
>=20>  Ack!
> >=20
>=20Fixes: d2d6422f8bd1 ("x86: Allow to enable PREEMPT_RT.")
>=20
>=20That was the first commit to enable PREEMPT_RT on any architecture (j=
ust
> happened to be x86).
>=20
>=20-- Steve
>

Thanks Steve, it helped a lot=20!