Muchun Song 6acfb5ba15 mm: migrate: fix missing update page_private to hugetlb_page_subpool ... Since commit d6995da311 ("hugetlb: use page.private for hugetlb specific page flags") converts page.private for hugetlb specific page flags. We should use hugetlb_page_subpool() to get the subpool pointer instead of page_private(). This 'could' prevent the migration of hugetlb pages. page_private(hpage) is now used for hugetlb page specific flags. At migration time, the only flag which could be set is HPageVmemmapOptimized. This flag will only be set if the new vmemmap reduction feature is enabled. In addition, !page_mapping() implies an anonymous mapping. So, this will prevent migration of hugetb pages in anonymous mappings if the vmemmap reduction feature is enabled. In addition, that if statement checked for the rare race condition of a page being migrated while in the process of being freed. Since that check is now wrong, we could leak hugetlb subpool usage counts. The commit forgot to update it in the page migration routine. So fix it. [songmuchun@bytedance.com: fix compiler error when !CONFIG_HUGETLB_PAGE reported by Randy] Link: https://lkml.kernel.org/r/20210521022747.35736-1-songmuchun@bytedance.com Link: https://lkml.kernel.org/r/20210520025949.1866-1-songmuchun@bytedance.com Fixes: d6995da311 ("hugetlb: use page.private for hugetlb specific page flags") Signed-off-by: Muchun Song <songmuchun@bytedance.com> Reported-by: Anshuman Khandual <anshuman.khandual@arm.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Tested-by: Anshuman Khandual <anshuman.khandual@arm.com> [arm64] Cc: Oscar Salvador <osalvador@suse.de> Cc: David Hildenbrand <david@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Xiongchun Duan <duanxiongchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2021-06-30 20:47:29 -07:00
..
acpi	Merge branches 'acpi-cppc', 'acpi-video' and 'acpi-utils'	2021-04-26 17:04:27 +02:00
asm-generic	mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA	2021-06-29 10:53:55 -07:00
clocksource	ARM: platform support for Apple M1	2021-04-26 12:30:36 -07:00
crypto
drm
dt-bindings	dt-bindings: connector: Add PD rev 2.0 VDO definition	2021-06-04 11:43:01 +02:00
keys	integrity-v5.13	2021-05-01 15:32:18 -07:00
kunit	kunit: make test->lock irq safe	2021-06-29 10:53:46 -07:00
kvm
linux	mm: migrate: fix missing update page_private to hugetlb_page_subpool	2021-06-30 20:47:29 -07:00
math-emu
media	media updates for v5.13-rc1	2021-04-28 09:24:36 -07:00
memory
misc
net	net: inline function get_net_ns_by_fd if NET_NS is disabled	2021-06-15 11:00:45 -07:00
pcmcia
ras
rdma
scsi	SCSI misc on 20210428	2021-04-28 17:22:10 -07:00
soc	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
sound	ASoC: Fixes for v5.13	2021-05-25 08:58:01 +02:00
target
trace	include/trace/events/vmscan.h: remove mm_vmscan_inactive_list_is_low	2021-06-30 20:47:28 -07:00
uapi	mm/mempolicy: don't handle MPOL_LOCAL like a fake MPOL_PREFERRED policy	2021-06-30 20:47:29 -07:00
vdso
video
xen	xen/arm: move xen_swiotlb_detect to arm/swiotlb-xen.h	2021-05-14 15:52:05 +02:00