From: Oscar Salvador <osalvador@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: David Hildenbrand <david@redhat.com>,
Michal Hocko <mhocko@kernel.org>,
VlastimilBabkavbabka@suse.cz, pasha.tatashin@soleen.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Anshuman Khandual <anshuman.khandual@arm.com>,
Oscar Salvador <osalvador@suse.de>
Subject: [PATCH v2 5/7] mm,memory_hotplug: Enforce pageblock alignment when memmap_on_memory
Date: Tue, 9 Feb 2021 14:38:52 +0100 [thread overview]
Message-ID: <20210209133854.17399-6-osalvador@suse.de> (raw)
In-Reply-To: <20210209133854.17399-1-osalvador@suse.de>
Many places expects us to pass a pageblock aligned range.
E.g: memmap_init_zone() needs a pageblock aligned range in order
to set the proper migrate type for it.
online_pages() needs to operate on a pageblock aligned range for
isolation purposes.
Make sure we disable the feature in case we cannot guarantee the
right alignment.
Signed-off-by: Oscar Salvador <osalvador@suse.de>
---
mm/memory_hotplug.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index d3fb036d33fd..1a4d5dd1a2c8 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -56,12 +56,16 @@ static int memmap_on_memory_show(char *buffer, const struct kernel_param *kp)
static __meminit int memmap_on_memory_store(const char *val,
const struct kernel_param *kp)
{
+ unsigned long pageblock_size = PFN_PHYS(pageblock_nr_pages);
+
/*
* Fail silently in case we cannot enable it due to system constraints.
* User can always check whether it is enabled or not via /sys/module.
*/
if (!IS_ENABLED(CONFIG_ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE) ||
- (PMD_SIZE % sizeof(struct page)))
+ (PMD_SIZE % sizeof(struct page)) ||
+ !(MIN_MEMORY_BLOCK_SIZE - PMD_SIZE) ||
+ !(MIN_MEMORY_BLOCK_SIZE - PMD_SIZE) % pageblock_size)
return 0;
return param_set_bool(val, kp);
--
2.16.3
next prev parent reply other threads:[~2021-02-09 13:39 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 13:38 [PATCH v2 0/7] Allocate memmap from hotadded memory (per device) Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 1/7] mm,memory_hotplug: Allocate memmap from the added memory range Oscar Salvador
2021-02-25 18:58 ` David Hildenbrand
2021-02-28 18:50 ` Oscar Salvador
2021-03-01 8:30 ` David Hildenbrand
2021-03-01 8:32 ` David Hildenbrand
2021-02-09 13:38 ` [PATCH v2 2/7] acpi,memhotplug: Enable MHP_MEMMAP_ON_MEMORY when supported Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 3/7] mm,memory_hotplug: Add kernel boot option to enable memmap_on_memory Oscar Salvador
2021-02-25 18:25 ` David Hildenbrand
2021-02-26 12:14 ` Oscar Salvador
2021-03-01 8:27 ` David Hildenbrand
2021-02-09 13:38 ` [PATCH v2 4/7] mm,memory_hotplug: Enforce struct page size to be multiple of PMD Oscar Salvador
2021-02-25 18:26 ` David Hildenbrand
2021-02-26 12:06 ` Oscar Salvador
2021-03-01 10:06 ` Oscar Salvador
2021-03-01 10:24 ` David Hildenbrand
2021-02-09 13:38 ` Oscar Salvador [this message]
2021-02-25 18:27 ` [PATCH v2 5/7] mm,memory_hotplug: Enforce pageblock alignment when memmap_on_memory David Hildenbrand
2021-02-26 12:06 ` Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 6/7] x86/Kconfig: Introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE Oscar Salvador
2021-02-25 18:29 ` David Hildenbrand
2021-02-26 12:04 ` Oscar Salvador
2021-03-01 8:45 ` David Hildenbrand
2021-03-01 10:07 ` Oscar Salvador
2021-02-09 13:38 ` [PATCH v2 7/7] arm64/Kconfig: " Oscar Salvador
2021-02-25 18:29 ` David Hildenbrand
2021-02-26 12:10 ` Oscar Salvador
2021-02-17 10:18 ` [PATCH v2 0/7] Allocate memmap from hotadded memory (per device) Oscar Salvador
2021-02-22 11:15 ` Oscar Salvador
2021-02-22 11:28 ` David Hildenbrand
2021-02-23 7:48 ` Oscar Salvador
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