From: Michal Hocko <mhocko@kernel.org>
To: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: akpm@linux-foundation.org, osalvador@suse.de,
dan.j.williams@intel.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, david@redhat.com
Subject: Re: [PATCH] mm/spase: never partially remove memmap for early section
Date: Tue, 23 Jun 2020 17:18:28 +0200 [thread overview]
Message-ID: <20200623151828.GA31426@dhcp22.suse.cz> (raw)
In-Reply-To: <20200623094258.6705-1-richard.weiyang@linux.alibaba.com>
On Tue 23-06-20 17:42:58, Wei Yang wrote:
> For early sections, we assumes its memmap will never be partially
> removed. But current behavior breaks this.
>
> Let's correct it.
>
> Fixes: ba72b4c8cf60 ("mm/sparsemem: support sub-section hotplug")
> Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Can a user trigger this or is this a theoretical bug?
> ---
> mm/sparse.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/sparse.c b/mm/sparse.c
> index b2b9a3e34696..1a0069f492f5 100644
> --- a/mm/sparse.c
> +++ b/mm/sparse.c
> @@ -825,10 +825,10 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages,
> ms->section_mem_map &= ~SECTION_HAS_MEM_MAP;
> }
>
> - if (section_is_early && memmap)
> - free_map_bootmem(memmap);
> - else
> + if (!section_is_early)
This begs a comment.
> depopulate_section_memmap(pfn, nr_pages, altmap);
> + else if (memmap)
> + free_map_bootmem(memmap);
>
> if (empty)
> ms->section_mem_map = (unsigned long)NULL;
> --
> 2.20.1 (Apple Git-117)
>
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-06-23 15:19 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 9:42 [PATCH] mm/spase: never partially remove memmap for early section Wei Yang
2020-06-23 12:44 ` David Hildenbrand
2020-06-23 13:02 ` Wei Yang
2020-06-23 13:16 ` David Hildenbrand
2020-06-23 15:18 ` Michal Hocko [this message]
2020-06-23 21:48 ` Wei Yang
2020-06-24 6:13 ` Wei Yang
2020-06-24 16:10 ` Dan Williams
2020-06-24 22:05 ` Wei Yang
2020-06-24 22:20 ` Dan Williams
2020-06-24 22:44 ` Wei Yang
2020-06-24 23:47 ` Dan Williams
2020-06-25 5:53 ` David Hildenbrand
2020-06-25 19:46 ` Dan Williams
2020-06-25 22:29 ` Wei Yang
2020-06-29 8:34 ` Wei Yang
2020-06-29 22:13 ` Dan Williams
2020-06-29 22:58 ` Wei Yang
2020-06-30 7:16 ` David Hildenbrand
2020-06-25 22:39 ` Wei Yang
2020-06-26 4:59 ` David Hildenbrand
2020-06-24 7:48 ` David Hildenbrand
2020-06-24 8:04 ` David Hildenbrand
2020-06-24 8:13 ` Wei Yang
2020-06-24 8:41 ` David Hildenbrand
2020-06-24 8:50 ` Michal Hocko
2020-06-24 22:27 ` Wei Yang
2020-06-24 0:21 ` Dan Williams
2020-06-24 1:11 ` Wei Yang
2020-06-24 1:47 ` Baoquan He
2020-06-24 2:14 ` Baoquan He
2020-06-24 3:46 ` Wei Yang
2020-06-24 3:52 ` Baoquan He
2020-06-24 3:56 ` Wei Yang
2020-06-24 8:51 ` David Hildenbrand
2020-06-24 22:08 ` Wei Yang
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