From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: "Chen, Yu C" <yu.c.chen@intel.com>
Cc: srikar@linux.ibm.com, venkat88@linux.ibm.com,
maddy@linux.ibm.com, riteshh@linux.ibm.com, chleroy@kernel.org,
tim.c.chen@linux.intel.com, peterz@infradead.org,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-sched@vger.kernel.org, kprateek.nayak@amd.com
Subject: Re: [BUG] sched/cache: "Make LLC id continuous" causes NULL cpumask
Date: Thu, 28 May 2026 15:56:23 +0530 [thread overview]
Message-ID: <a4d3703e-45a8-4f83-b854-14dbd0e62d1e@linux.ibm.com> (raw)
In-Reply-To: <db443a1e-e6fc-491c-a38a-1cafc8e674cd@intel.com>
Hi Chenyu.
> Yes this direction look good to me. Regarding the arch_llc_mask(),
> how about the following per Srikar's description
>
> const struct cpumask *arch_llc_mask(int cpu)
> {
> /* Power9, CACHE domain is the LLC*/ if (shared_caches)
> return cpu_l2_cache_mask(cpu);
>
> /* P7, P8, P10, P11, SMT domain is the LLC*/ return
> cpu_smt_mask(cpu);
> }
>
> thanks,
> Chenyu
>
Yes. this is what i was thinking too. I have the patch, let me send it
across shortly. It is fixing the boot panic for me in SPLPAR. Hopefully
it should work for others too.
I will send it as reply to main thread so one doesn't miss it out.
next prev parent reply other threads:[~2026-05-28 10:26 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-25 14:07 [BUG] sched/cache: "Make LLC id continuous" causes NULL cpumask dereference in build_sched_domains on POWER9 Venkat Rao Bagalkote
2026-05-25 15:35 ` Chen, Yu C
2026-05-25 16:16 ` K Prateek Nayak
2026-05-26 3:14 ` Chen, Yu C
2026-05-26 3:14 ` Srikar Dronamraju
2026-05-26 4:08 ` Chen, Yu C
2026-05-26 4:58 ` Srikar Dronamraju
2026-05-26 5:53 ` K Prateek Nayak
2026-05-26 14:08 ` [BUG] sched/cache: "Make LLC id continuous" causes NULL cpumask Chen Yu
2026-05-27 7:01 ` Shrikanth Hegde
2026-05-27 16:05 ` Chen, Yu C
2026-05-27 18:07 ` Shrikanth Hegde
2026-05-28 4:58 ` Shrikanth Hegde
2026-05-28 9:12 ` Chen, Yu C
2026-05-28 10:26 ` Shrikanth Hegde [this message]
2026-05-28 15:54 ` Srikar Dronamraju
2026-05-28 15:58 ` Srikar Dronamraju
2026-05-27 16:30 ` K Prateek Nayak
2026-05-26 5:24 ` [BUG] sched/cache: "Make LLC id continuous" causes NULL cpumask dereference in build_sched_domains on POWER9 Venkat Rao Bagalkote
2026-05-27 7:05 ` Shrikanth Hegde
2026-05-28 16:01 ` Srikar Dronamraju
2026-05-28 6:54 ` Ritesh Harjani
2026-05-28 16:06 ` Srikar Dronamraju
2026-05-28 11:27 ` Shrikanth Hegde
2026-05-28 13:21 ` Chen, Yu C
2026-05-28 15:06 ` Ritesh Harjani
2026-05-28 15:56 ` Srikar Dronamraju
2026-05-28 16:31 ` Shrikanth Hegde
2026-05-28 16:44 ` Srikar Dronamraju
2026-05-29 3:58 ` Shrikanth Hegde
2026-05-29 6:59 ` Venkat Rao Bagalkote
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