From: Baoquan He <bhe@redhat.com>
To: Wei Yang <richardw.yang@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org, dan.j.williams@intel.com,
david@redhat.com
Subject: Re: [PATCH 7/7] mm/hotplug: fix hot remove failure in SPARSEMEM|!VMEMMAP case
Date: Mon, 10 Feb 2020 11:41:05 +0800 [thread overview]
Message-ID: <20200210034105.GA8965@MiWiFi-R3L-srv> (raw)
In-Reply-To: <20200209235202.GC8705@richard>
On 02/10/20 at 07:52am, Wei Yang wrote:
> >---
> > mm/sparse.c | 4 +++-
> > 1 file changed, 3 insertions(+), 1 deletion(-)
> >
> >diff --git a/mm/sparse.c b/mm/sparse.c
> >index 623755e88255..345d065ef6ce 100644
> >--- a/mm/sparse.c
> >+++ b/mm/sparse.c
> >@@ -854,13 +854,15 @@ 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);
>
> The crash happens in depopulate_section_memmap() when trying to get memmap by
> pfn_to_page(). Can we pass memmap directly?
Yes, that's also a good idea. While it needs to add a parameter for
depopulate_section_memmap(), the parameter is useless for VMEMMAP
though, I personally prefer the current fix which is a little simpler.
Anyway, both is fine to me, I can update if you think passing memmap is
better.
>
> >+
> >+ if(!rc)
> >+ ms->section_mem_map = (unsigned long)NULL;
> > }
> >
> > static struct page * __meminit section_activate(int nid, unsigned long pfn,
> >--
> >2.17.2
>
> --
> Wei Yang
> Help you, Help me
>
next prev parent reply other threads:[~2020-02-10 3:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-09 10:48 [PATCH 0/7] mm/hotplug: Only use subsection in VMEMMAP case and fix hot add/remove failure in SPARSEMEM|!VMEMMAP case Baoquan He
2020-02-09 10:48 ` [PATCH 1/7] mm/sparse.c: Introduce new function fill_subsection_map() Baoquan He
2020-02-09 23:05 ` Wei Yang
2020-02-09 23:11 ` Wei Yang
2020-02-10 3:25 ` Baoquan He
2020-02-10 9:49 ` David Hildenbrand
2020-02-11 12:46 ` Baoquan He
2020-02-11 14:44 ` David Hildenbrand
2020-02-12 11:21 ` Baoquan He
2020-02-09 10:48 ` [PATCH 2/7] mm/sparse.c: Introduce a new function clear_subsection_map() Baoquan He
2020-02-09 23:07 ` Wei Yang
2020-02-10 3:36 ` Baoquan He
2020-02-10 6:02 ` Wei Yang
2020-02-09 10:48 ` [PATCH 3/7] mm/sparse.c: only use subsection map in VMEMMAP case Baoquan He
2020-02-09 23:23 ` Wei Yang
2020-02-11 14:43 ` David Hildenbrand
2020-02-12 11:26 ` Baoquan He
2020-02-11 20:14 ` Dan Williams
2020-02-12 9:39 ` David Hildenbrand
2020-02-12 11:20 ` Baoquan He
2020-02-12 15:48 ` Dan Williams
2020-02-09 10:48 ` [PATCH 4/7] mm/sparse.c: Use __get_free_pages() instead in populate_section_memmap() Baoquan He
2020-02-09 23:39 ` Wei Yang
2020-02-09 10:48 ` [PATCH 5/7] mm/sparse.c: update code comment about section activate/deactivate Baoquan He
2020-02-09 10:48 ` [PATCH 6/7] mm/sparsemem: pfn_to_page is not valid yet on SPARSEMEM Baoquan He
2020-02-10 3:45 ` Baoquan He
2020-02-09 10:48 ` [PATCH 7/7] mm/hotplug: fix hot remove failure in SPARSEMEM|!VMEMMAP case Baoquan He
2020-02-09 23:52 ` Wei Yang
2020-02-10 3:41 ` Baoquan He [this message]
2020-02-10 6:08 ` Wei Yang
2020-02-10 7:54 ` Baoquan He
2020-02-10 23:05 ` Wei Yang
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