From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>, Vlastimil Babka <vbabka@suse.cz>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Pavel Tatashin <pasha.tatashin@oracle.com>,
Kemi Wang <kemi.wang@intel.com>,
David Rientjes <rientjes@google.com>,
Jia He <jia.he@hxt-semitech.com>,
Oscar Salvador <osalvador@suse.de>,
Petr Tesarik <ptesarik@suse.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Dan Williams <dan.j.williams@intel.com>,
David Hildenbrand <david@redhat.com>,
Mathieu Malaterre <malat@debian.org>, Baoquan He <bhe@redhat.com>,
Wei Yang <richard.weiyang@gmail.com>,
Ross Zwisler <zwisler@kernel.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [PATCH v1 2/5] mm/memory_hotplug: enforce section alignment when onlining/offlining
Date: Thu, 16 Aug 2018 12:06:25 +0200 [thread overview]
Message-ID: <20180816100628.26428-3-david@redhat.com> (raw)
In-Reply-To: <20180816100628.26428-1-david@redhat.com>
onlining/offlining code works on whole sections, so let's enforce that.
Existing code only allows to add memory in memory block size. And only
whole memory blocks can be onlined/offlined. Memory blocks are always
aligned to sections, so this should not break anything.
online_pages/offline_pages will implicitly mark whole sections
online/offline, so the code really can only handle such granularities.
(especially offlining code cannot deal with pageblock_nr_pages but
theoretically only MAX_ORDER-1)
Signed-off-by: David Hildenbrand <david@redhat.com>
---
mm/memory_hotplug.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 090cf474de87..30d2fa42b0bb 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -897,6 +897,11 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
struct memory_notify arg;
struct memory_block *mem;
+ if (!IS_ALIGNED(pfn, PAGES_PER_SECTION))
+ return -EINVAL;
+ if (!IS_ALIGNED(nr_pages, PAGES_PER_SECTION))
+ return -EINVAL;
+
/*
* We can't use pfn_to_nid() because nid might be stored in struct page
* which is not yet initialized. Instead, we find nid from memory block.
@@ -1600,10 +1605,9 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
struct zone *zone;
struct memory_notify arg;
- /* at least, alignment against pageblock is necessary */
- if (!IS_ALIGNED(start_pfn, pageblock_nr_pages))
+ if (!IS_ALIGNED(start_pfn, PAGES_PER_SECTION))
return -EINVAL;
- if (!IS_ALIGNED(end_pfn, pageblock_nr_pages))
+ if (!IS_ALIGNED(nr_pages, PAGES_PER_SECTION))
return -EINVAL;
/* This makes hotplug much easier...and readable.
we assume this for now. .*/
--
2.17.1
next prev parent reply other threads:[~2018-08-16 10:06 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-16 10:06 [PATCH v1 0/5] mm/memory_hotplug: online/offline_pages refactorings David Hildenbrand
2018-08-16 10:06 ` [PATCH v1 1/5] mm/memory_hotplug: drop intermediate __offline_pages David Hildenbrand
2018-08-16 11:44 ` Stephen Rothwell
2018-08-16 12:08 ` David Hildenbrand
2018-08-16 18:50 ` kbuild test robot
2018-08-30 20:17 ` Pasha Tatashin
2018-08-30 20:20 ` Pasha Tatashin
2018-08-16 10:06 ` David Hildenbrand [this message]
2018-08-16 12:34 ` [PATCH v1 2/5] mm/memory_hotplug: enforce section alignment when onlining/offlining Oscar Salvador
2018-08-30 22:14 ` Pasha Tatashin
2018-08-31 7:51 ` David Hildenbrand
2018-08-16 10:06 ` [PATCH v1 3/5] mm/memory_hotplug: check if sections are already online/offline David Hildenbrand
2018-08-16 10:47 ` Oscar Salvador
2018-08-16 11:00 ` David Hildenbrand
2018-08-30 22:17 ` Pasha Tatashin
2018-08-16 10:06 ` [PATCH v1 4/5] mm/memory_hotplug: onlining pages can only fail due to notifiers David Hildenbrand
2018-08-30 22:30 ` Pasha Tatashin
2018-08-16 10:06 ` [PATCH v1 5/5] mm/memory_hotplug: print only with DEBUG_VM in online/offline_pages() David Hildenbrand
2018-08-17 8:18 ` Oscar Salvador
2018-08-19 12:34 ` Wei Yang
2018-08-20 9:57 ` David Hildenbrand
2018-08-20 13:12 ` Wei Yang
2018-08-20 9:45 ` David Hildenbrand
2018-08-20 9:49 ` David Hildenbrand
2018-08-20 10:46 ` David Hildenbrand
2018-08-30 22:36 ` Pasha Tatashin
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