From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Qian Cai <cai@lca.pw>, Dan Williams <dan.j.williams@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Oscar Salvador <osalvador@suse.de>, Linux MM <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -next] mm/hotplug: skip bad PFNs from pfn_to_online_page()
Date: Fri, 14 Jun 2019 14:28:40 +0530 [thread overview]
Message-ID: <87lfy4ilvj.fsf@linux.ibm.com> (raw)
In-Reply-To: <1560376072.5154.6.camel@lca.pw>
Qian Cai <cai@lca.pw> writes:
> 1) offline is busted [1]. It looks like test_pages_in_a_zone() missed the same
> pfn_section_valid() check.
>
> 2) powerpc booting is generating endless warnings [2]. In vmemmap_populated() at
> arch/powerpc/mm/init_64.c, I tried to change PAGES_PER_SECTION to
> PAGES_PER_SUBSECTION, but it alone seems not enough.
>
Can you check with this change on ppc64. I haven't reviewed this series yet.
I did limited testing with change . Before merging this I need to go
through the full series again. The vmemmap poplulate on ppc64 needs to
handle two translation mode (hash and radix). With respect to vmemap
hash doesn't setup a translation in the linux page table. Hence we need
to make sure we don't try to setup a mapping for a range which is
arleady convered by an existing mapping.
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index a4e17a979e45..15c342f0a543 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -88,16 +88,23 @@ static unsigned long __meminit vmemmap_section_start(unsigned long page)
* which overlaps this vmemmap page is initialised then this page is
* initialised already.
*/
-static int __meminit vmemmap_populated(unsigned long start, int page_size)
+static bool __meminit vmemmap_populated(unsigned long start, int page_size)
{
unsigned long end = start + page_size;
start = (unsigned long)(pfn_to_page(vmemmap_section_start(start)));
- for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
- if (pfn_valid(page_to_pfn((struct page *)start)))
- return 1;
+ for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page))) {
- return 0;
+ struct mem_section *ms;
+ unsigned long pfn = page_to_pfn((struct page *)start);
+
+ if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
+ return 0;
+ ms = __nr_to_section(pfn_to_section_nr(pfn));
+ if (valid_section(ms))
+ return true;
+ }
+ return false;
}
/*
next prev parent reply other threads:[~2019-06-14 8:58 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 19:15 [PATCH -next] mm/hotplug: skip bad PFNs from pfn_to_online_page() Qian Cai
2019-06-12 19:37 ` Dan Williams
2019-06-12 19:38 ` Dan Williams
2019-06-12 21:47 ` Qian Cai
2019-06-12 21:52 ` Dan Williams
2019-06-12 23:13 ` Dan Williams
2019-06-13 0:06 ` Dan Williams
2019-06-14 8:58 ` Aneesh Kumar K.V [this message]
2019-06-14 14:59 ` Qian Cai
2019-06-14 18:03 ` Dan Williams
2019-06-14 18:57 ` Dan Williams
2019-06-14 19:40 ` Qian Cai
2019-06-14 19:48 ` Dan Williams
2019-06-14 20:43 ` Qian Cai
2019-06-16 15:42 ` Dan Williams
2019-06-17 2:25 ` Qian Cai
2019-06-14 15:35 ` Oscar Salvador
2019-06-14 16:18 ` Aneesh Kumar K.V
2019-06-14 16:22 ` Dan Williams
2019-06-14 16:26 ` Aneesh Kumar K.V
2019-06-14 16:36 ` Dan Williams
2019-06-14 16:50 ` Aneesh Kumar K.V
2019-06-14 16:55 ` Aneesh Kumar K.V
2019-06-14 17:08 ` Jeff Moyer
2019-06-14 17:14 ` Dan Williams
2019-06-14 17:40 ` Aneesh Kumar K.V
2019-06-16 3:49 ` Aneesh Kumar K.V
2019-06-17 17:21 ` Dan Williams
2019-06-13 18:42 ` Qian Cai
2019-06-14 1:17 ` Dan Williams
2019-06-14 1:29 ` Qian Cai
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