linux/arch
Naoya Horiguchi 83467efbdb mm: migrate: check movability of hugepage in unmap_and_move_huge_page()
Currently hugepage migration works well only for pmd-based hugepages
(mainly due to lack of testing,) so we had better not enable migration of
other levels of hugepages until we are ready for it.

Some users of hugepage migration (mbind, move_pages, and migrate_pages) do
page table walk and check pud/pmd_huge() there, so they are safe.  But the
other users (softoffline and memory hotremove) don't do this, so without
this patch they can try to migrate unexpected types of hugepages.

To prevent this, we introduce hugepage_migration_support() as an
architecture dependent check of whether hugepage are implemented on a pmd
basis or not.  And on some architecture multiple sizes of hugepages are
available, so hugepage_migration_support() also checks hugepage size.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Rik van Riel <riel@redhat.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-09-11 15:57:49 -07:00
..
alpha oprofilefs_create_...() do not need superblock argument 2013-09-03 22:52:48 -04:00
arc Device tree core updates for v3.12 2013-09-10 13:53:52 -07:00
arm mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
arm64 mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
avr32 - factor out common code from MTD tests 2013-09-09 10:33:19 -07:00
blackfin Merge branch 'cpuinit_phase2' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2013-07-18 10:50:26 -07:00
c6x of: consolidate definition of early_init_dt_alloc_memory_arch() 2013-08-28 21:18:32 +01:00
cris CRIS: drop unused Kconfig symbols 2013-09-10 17:38:07 +02:00
frv frv/PCI: Mark pcibios_fixup_bus() as non-init 2013-07-25 12:18:42 -06:00
h8300 net: rename busy poll socket op and globals 2013-07-10 17:08:27 -07:00
hexagon arch: *: Kconfig: add "kernel/Kconfig.freezer" to "arch/*/Kconfig" 2013-08-13 17:57:49 -07:00
ia64 mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
m32r m32r: delete __cpuinit usage from all m32r files 2013-07-14 19:36:55 -04:00
m68k Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2013-09-09 09:04:46 -07:00
metag mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
microblaze Device tree core updates for v3.12 2013-09-10 13:53:52 -07:00
mips mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
mn10300 mn10300: Fix crash just after starting userspace on !CONFIG_PREEMPT 2013-09-10 14:54:59 -07:00
openrisc Device tree core updates for v3.12 2013-09-10 13:53:52 -07:00
parisc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-09-06 09:36:28 -07:00
powerpc mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
s390 mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
score arch: *: Kconfig: add "kernel/Kconfig.freezer" to "arch/*/Kconfig" 2013-08-13 17:57:49 -07:00
sh mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
sparc mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
tile mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
um um: Add irq chip um/mask handlers 2013-09-07 10:57:19 +02:00
unicore32 reboot: move arch/x86 reboot= handling to generic kernel 2013-07-09 10:33:29 -07:00
x86 mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
xtensa of: Specify initrd location using 64-bit 2013-07-24 11:10:01 +01:00
.gitignore
Kconfig microblaze: fix clone syscall 2013-08-13 17:57:48 -07:00