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Subject: Re: [PATCH] mm/slab: protect cache_reap() against CPU and memory hot
 plug operations
To:     Sasha Levin <sashal@kernel.org>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
Cc:     stable@vger.kernel.org, Christoph Lameter <cl@linux.com>,
        Pekka Enberg <penberg@kernel.org>,
        David Rientjes <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>
References: <20190311191701.24325-1-ldufour@linux.ibm.com>
 <20190325003841.503582148D@mail.kernel.org>
From:   Laurent Dufour <ldufour@linux.ibm.com>
Date:   Mon, 25 Mar 2019 11:28:45 +0100
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Le 25/03/2019 à 01:38, Sasha Levin a écrit :
> Hi,
> 
> [This is an automated email]
> 
> This commit has been processed because it contains a -stable tag.
> The stable tag indicates that it's relevant for the following trees: all
> 
> The bot has tested the following trees: v5.0.3, v4.19.30, v4.14.107, v4.9.164, v4.4.176, v3.18.136.
> 
> v5.0.3: Build OK!
> v4.19.30: Build OK!
> v4.14.107: Build OK!
> v4.9.164: Build OK!
> v4.4.176: Failed to apply! Possible dependencies:
>      27590dc17b34 ("hrtimer: Convert to hotplug state machine")
>      31487f8328f2 ("smp/cfd: Convert core to hotplug state machine")
>      512089d98457 ("perf/x86/intel/rapl: Clean up the printk output")
>      55f2890f0726 ("perf/x86/intel/rapl: Add proper error handling")
>      57ecde42cc74 ("powerpc/perf: Convert book3s notifier to state machine callbacks")
>      6731d4f12315 ("slab: Convert to hotplug state machine")
>      6b2c28471de5 ("x86/x2apic: Convert to CPU hotplug state machine")
>      7162b8fea630 ("perf/x86/intel/rapl: Refactor the code some more")
>      75c7003fbf41 ("perf/x86/intel/rapl: Calculate timing once")
>      7ee681b25284 ("workqueue: Convert to state machine callbacks")
>      8a6d2f8f73ca ("perf/x86/intel/rapl: Utilize event->pmu_private")
>      8b5b773d6245 ("perf/x86/intel/rapl: Convert to hotplug state machine")
>      9de8d686955b ("perf/x86/intel/rapl: Convert it to a per package facility")
>      a208749c6426 ("perf/x86/intel/rapl: Make PMU lock raw")
>      a409f5ee2937 ("blackfin/perf: Convert hotplug notifier to state machine")
>      b8b3319a471b ("perf/x86/intel/rapl: Sanitize the quirk handling")
>      e3cfce17d309 ("sh/perf: Convert the hotplug notifiers to state machine callbacks")
>      e6d4989a9ad1 ("relayfs: Convert to hotplug state machine")
>      e722d8daafb9 ("profile: Convert to hotplug state machine")
> 
> v3.18.136: Failed to apply! Possible dependencies:
>      13ca62b243f6 ("ACPI: Fix minor syntax issues in processor_core.c")
>      27590dc17b34 ("hrtimer: Convert to hotplug state machine")
>      31487f8328f2 ("smp/cfd: Convert core to hotplug state machine")
>      4daa832d9987 ("x86: Drop bogus __ref / __refdata annotations")
>      57ecde42cc74 ("powerpc/perf: Convert book3s notifier to state machine callbacks")
>      645523960102 ("perf/x86/intel/rapl: Fix energy counter measurements but supporing per domain energy units")
>      6731d4f12315 ("slab: Convert to hotplug state machine")
>      6b2c28471de5 ("x86/x2apic: Convert to CPU hotplug state machine")
>      7162b8fea630 ("perf/x86/intel/rapl: Refactor the code some more")
>      7ee681b25284 ("workqueue: Convert to state machine callbacks")
>      828aef376d7a ("ACPI / processor: Introduce phys_cpuid_t for CPU hardware ID")
>      8b5b773d6245 ("perf/x86/intel/rapl: Convert to hotplug state machine")
>      9de8d686955b ("perf/x86/intel/rapl: Convert it to a per package facility")
>      a409f5ee2937 ("blackfin/perf: Convert hotplug notifier to state machine")
>      af8f3f514d19 ("ACPI / processor: Convert apic_id to phys_id to make it arch agnostic")
>      d02dc27db0dc ("ACPI / processor: Rename acpi_(un)map_lsapic() to acpi_(un)map_cpu()")
>      d089f8e97d37 ("x86: fix up obsolete cpu function usage.")
>      e3cfce17d309 ("sh/perf: Convert the hotplug notifiers to state machine callbacks")
>      e6d4989a9ad1 ("relayfs: Convert to hotplug state machine")
>      e722d8daafb9 ("profile: Convert to hotplug state machine")
>      ecf5636dcd59 ("ACPI: Add interfaces to parse IOAPIC ID for IOAPIC hotplug")
>      fdaf3a6539d6 ("x86: fix more deprecated cpu function usage.")
> 
> 
> How should we proceed with this patch?

Please forget about it.

As reported by Michal, this patch is useless.
Sorry for the noise.

Thanks,
Laurent.