From: Thomas Gleixner <tglx@linutronix.de>
To: Linus Torvalds <torvalds@linuxfoundation.org>,
Guenter Roeck <linux@roeck-us.net>
Cc: LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, Uros Bizjak <ubizjak@gmail.com>,
linux-sparse@vger.kernel.org, lkp@intel.com,
oe-kbuild-all@lists.linux.dev
Subject: Re: [patch 5/9] x86: Cure per CPU madness on UP
Date: Fri, 15 Mar 2024 18:40:42 +0100 [thread overview]
Message-ID: <87y1ajjsv9.ffs@tglx> (raw)
In-Reply-To: <CAHk-=whK=G1o6RtS9DS3wEGF1KU7WLgLL1+6Se86bj8m7wwqrQ@mail.gmail.com>
On Fri, Mar 15 2024 at 09:42, Linus Torvalds wrote:
> On Fri, 15 Mar 2024 at 09:17, Guenter Roeck <linux@roeck-us.net> wrote:
> Without line numbers (if you have debug info for that kernel, it's
> good to run "scripts/decode_stacktrace.sh" on stack traces) it's hard
> to really know what's up, but I strongly suspect that it's this:
>
> rapl_pmus->pmus[topology_logical_die_id(cpu)] = pmu;
>
> because we have
>
> topology_logical_die_id(cpu) ->
> (cpu_data(cpu).topo.logical_die_id)
>
> and we have
>
> c->topo.logical_die_id = topology_get_logical_id(apicid, TOPO_DIE_DOMAIN);
>
> and topology_get_logical_id() does this:
>
> if (lvlid >= MAX_LOCAL_APIC)
> return -ERANGE;
> if (!test_bit(lvlid, apic_maps[at_level].map))
> return -ENODEV;
>
> so that -ENODEV is not entirely unlikely for a UP run.
>
> This also explains why it *used* to work - that whole thing is new to
> the current merge window and came in through commit ca7e91776912
> ("Merge tag 'x86-apic-2024-03-10' of ...").
>
> Thomas, over to you. I wonder if maybe all those topology macros
> should just return 0 on an UP build, but that
> topology_get_logical_id() thing looks a bit wrong regardless.
>
> It really shouldn't depend on local apic data for configs that may not
> *have* a local apic.
Right. Let me look.
next prev parent reply other threads:[~2024-03-15 17:40 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-04 10:12 [patch 0/9] x86: Cure tons of sparse warnings (mostly __percpu) Thomas Gleixner
2024-03-04 10:12 ` [patch 1/9] perf/x86/amd/uncore: Fix __percpu annotation Thomas Gleixner
2024-03-04 10:12 ` [patch 2/9] x86/msr: Prepare for including percpu.h Thomas Gleixner
2024-03-04 10:12 ` [patch 3/9] x86/msr: Add missing __percpu annotations Thomas Gleixner
2024-03-04 10:12 ` [patch 4/9] smp: Consolidate smp_prepare_boot_cpu() Thomas Gleixner
2024-03-04 10:12 ` [patch 5/9] x86: Cure per CPU madness on UP Thomas Gleixner
2024-03-15 16:17 ` Guenter Roeck
2024-03-15 16:42 ` Linus Torvalds
2024-03-15 17:02 ` Guenter Roeck
2024-03-15 17:40 ` Thomas Gleixner [this message]
2024-03-15 22:55 ` Thomas Gleixner
2024-03-15 23:23 ` Linus Torvalds
2024-03-16 1:11 ` Thomas Gleixner
2024-03-16 1:23 ` Linus Torvalds
2024-03-16 21:34 ` Arnd Bergmann
2024-03-17 21:03 ` David Laight
2024-03-18 11:11 ` Thomas Gleixner
2024-03-18 17:27 ` Thomas Gleixner
2024-03-18 19:13 ` Arnd Bergmann
2024-03-19 16:21 ` Thomas Gleixner
2024-03-19 18:26 ` Guenter Roeck
2024-03-16 0:56 ` Guenter Roeck
2024-03-20 8:58 ` Thomas Gleixner
2024-03-20 15:46 ` Guenter Roeck
2024-03-21 11:14 ` Thomas Gleixner
2024-03-21 14:06 ` Guenter Roeck
2024-03-21 16:49 ` Thomas Gleixner
2024-03-04 10:12 ` [patch 6/9] x86/uaccess: Add missing __force to casts in __access_ok() and valid_user_address() Thomas Gleixner
2024-03-04 10:12 ` [patch 7/9] x86/cpu: Use EXPORT_PER_CPU_SYMBOL_GPL() for x86_spec_ctrl_current Thomas Gleixner
2024-03-04 10:12 ` [patch 8/9] x86/cpu: Provide a declaration for itlb_multihit_kvm_mitigation Thomas Gleixner
2024-03-04 10:12 ` [patch 9/9] x86/callthunks: Use EXPORT_PER_CPU_SYMBOL_GPL() for per CPU variables Thomas Gleixner
2024-03-04 11:08 ` [patch 0/9] x86: Cure tons of sparse warnings (mostly __percpu) Ingo Molnar
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