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Message-ID: <20200226130741.GH24216@MiWiFi-R3L-srv>
Date: Wed, 26 Feb 2020 21:07:41 +0800
From: Baoquan He <bhe@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
akpm@...ux-foundation.org, richardw.yang@...ux.intel.com,
osalvador@...e.de, dan.j.williams@...el.com, mhocko@...e.com,
rppt@...ux.ibm.com, robin.murphy@....com
Subject: Re: [PATCH v2 1/7] mm/hotplug: fix hot remove failure in
SPARSEMEM|!VMEMMAP case
On 02/26/20 at 01:31pm, David Hildenbrand wrote:
> On 20.02.20 05:33, Baoquan He wrote:
> > In section_deactivate(), pfn_to_page() doesn't work any more after
> > ms->section_mem_map is resetting to NULL in SPARSEMEM|!VMEMMAP case.
> > It caused hot remove failure:
> >
> > kernel BUG at mm/page_alloc.c:4806!
> > invalid opcode: 0000 [#1] SMP PTI
> > CPU: 3 PID: 8 Comm: kworker/u16:0 Tainted: G W 5.5.0-next-20200205+ #340
> > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
> > Workqueue: kacpi_hotplug acpi_hotplug_work_fn
> > RIP: 0010:free_pages+0x85/0xa0
> > Call Trace:
> > __remove_pages+0x99/0xc0
> > arch_remove_memory+0x23/0x4d
> > try_remove_memory+0xc8/0x130
> > ? walk_memory_blocks+0x72/0xa0
> > __remove_memory+0xa/0x11
> > acpi_memory_device_remove+0x72/0x100
> > acpi_bus_trim+0x55/0x90
> > acpi_device_hotplug+0x2eb/0x3d0
> > acpi_hotplug_work_fn+0x1a/0x30
> > process_one_work+0x1a7/0x370
> > worker_thread+0x30/0x380
> > ? flush_rcu_work+0x30/0x30
> > kthread+0x112/0x130
> > ? kthread_create_on_node+0x60/0x60
> > ret_from_fork+0x35/0x40
> >
> > Let's move the ->section_mem_map resetting after depopulate_section_memmap()
> > to fix it.
> >
>
> Fixes: Tag? Stable: Tag?
Right, should add these. Will add them. Thanks for noticing.
>
> > Signed-off-by: Baoquan He <bhe@...hat.com>
> > ---
> > mm/sparse.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/mm/sparse.c b/mm/sparse.c
> > index 596b2a45b100..b8e52c8fed7f 100644
> > --- a/mm/sparse.c
> > +++ b/mm/sparse.c
> > @@ -779,13 +779,15 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
> > ms->usage = NULL;
> > }
> > memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
> > - ms->section_mem_map = (unsigned long)NULL;
> > }
> >
> > if (section_is_early && memmap)
> > free_map_bootmem(memmap);
> > else
> > depopulate_section_memmap(pfn, nr_pages, altmap);
> > +
> > + if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION))
> > + ms->section_mem_map = (unsigned long)NULL;
> > }
> >
> > static struct page * __meminit section_activate(int nid, unsigned long pfn,
> >
>
> Reviewed-by: David Hildenbrand <david@...hat.com>
>
> --
> Thanks,
>
> David / dhildenb
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