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Tue, 9 Jun 2026 09:09:05 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: ANX22ru2X65k Date: Tue, 09 Jun 2026 15:08:44 +0200 From: "Arnd Bergmann" To: "Gabriele Monaco" , "Alexei Starovoitov" , "Daniel Borkmann" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" , bpf@vger.kernel.org, Linux-Arch , linux-kernel@vger.kernel.org Cc: "Peter Zijlstra" , "Ingo Molnar" , "Will Deacon" , "Boqun Feng" , "Waiman Long" Message-Id: In-Reply-To: References: <20260609094941.56122-1-gmonaco@redhat.com> Subject: Re: [PATCH] rqspinlock: Fix order in raw_res_spin_(un)lock_irq to allow schedule Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Tue, Jun 9, 2026, at 15:04, Gabriele Monaco wrote: > On Tue, 2026-06-09 at 13:22 +0200, Arnd Bergmann wrote: >> Should this be Cc:stable@vger.kernel.org=C2=A0to get backported? > > Not sure if the Fixes: is enough to trigger the automation, I rarely > remember to Cc:stable@vger.kernel.org and they're usually picked. There is always human interaction. If you just have 'Fixes', this means someone will have to look at the patch carefully and make a decision, since a lot of bugfix patches either don't apply to old kernels or don't fall under the rules for stable backports. If the patch gets tagged Cc:, this means it is expected to be backported and needs less manual work. > In case I guess I'd need to re-submit the patch right? It can be added by whoever picks up the patch. >> Did you see this cause measurable performance problems, >> or did you find it through inspection? > > I noticed it while debugging an ENOMEM issue in the test_maps BPF > selftest on PREEMPT_RT and this was an obvious cuplrit (irq_work not > scheduled during a stress run). Turns out the problem is still there > after this fix though. Ok Arnd