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linux/arch/arm/mm
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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
..
abort-ev4.S
abort-ev4t.S
abort-ev5t.S
abort-ev5tj.S
abort-ev6.S
abort-ev7.S
abort-lv4t.S
abort-macro.S
abort-nommu.S
alignment.c Merge branch 'for-next' of git://git.pengutronix.de/git/ukl/linux into devel-stable 2013-03-09 15:49:32 +00:00
cache-aurora-l2.h
cache-fa.S
cache-feroceon-l2.c ARM: 7696/1: Fix kexec by setting outer_cache.inv_all for Feroceon 2013-04-17 16:53:27 +01:00
cache-l2x0.c Merge branches 'debug-choice', 'devel-stable' and 'misc' into for-linus 2013-09-05 10:34:15 +01:00
cache-nop.S ARM: Add base support for ARMv7-M 2013-04-17 21:38:10 +02:00
cache-tauros2.c
cache-v4.S ARM: mm: remove broken condition check for v4 flushing 2013-03-26 09:55:34 +00:00
cache-v4wb.S
cache-v4wt.S
cache-v6.S
cache-v7.S ARM: mm: use inner-shareable barriers for TLB and user cache operations 2013-08-12 12:25:45 +01:00
cache-xsc3l2.c
context.c ARM: tlb: don't perform inner-shareable invalidation for local TLB ops 2013-08-12 12:25:44 +01:00
copypage-fa.c
copypage-feroceon.c
copypage-v4mc.c
copypage-v4wb.c
copypage-v4wt.c
copypage-v6.c
copypage-xsc3.c
copypage-xscale.c
dma-mapping.c Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2013-09-05 18:07:32 -07:00
extable.c
fault-armv.c
fault.c ARM: 7775/1: mm: Remove do_sect_fault from LPAE code 2013-06-29 11:23:23 +01:00
fault.h
flush.c Merge branch 'devel-stable' into for-next 2013-06-29 11:44:43 +01:00
fsr-2level.c
fsr-3level.c ARM: mm: Transparent huge page support for LPAE systems. 2013-06-04 16:52:38 +01:00
highmem.c
hugetlbpage.c mm: migrate: check movability of hugepage in unmap_and_move_huge_page() 2013-09-11 15:57:49 -07:00
idmap.c ARM: KVM: move to a KVM provided HYP idmap 2013-04-28 22:23:08 -07:00
init.c Device tree core updates for v3.12 2013-09-10 13:53:52 -07:00
iomap.c
ioremap.c ARM: 7728/1: mm: Use phys_addr_t properly for ioremap functions 2013-05-23 00:09:44 +01:00
Kconfig ARM: 7816/1: CONFIG_KUSER_HELPERS: fix help text 2013-08-20 00:25:31 +01:00
Makefile Merge branch 'for-rmk/hugepages' of git://git.linaro.org/people/stevecapper/linux into devel-stable 2013-06-18 20:05:48 +01:00
mm.h
mmap.c mm: remove free_area_cache 2013-07-10 18:11:34 -07:00
mmu.c Merge branches 'debug-choice', 'devel-stable' and 'misc' into for-linus 2013-09-05 10:34:15 +01:00
nommu.c ARM: constify machine_desc structure uses 2013-07-26 14:55:59 +01:00
pabort-legacy.S
pabort-v6.S
pabort-v7.S
pgd.c
proc-arm7tdmi.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm9tdmi.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm720.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm740.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm920.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm922.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm925.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm926.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm940.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm946.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm1020.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm1020e.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm1022.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-arm1026.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-fa526.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-feroceon.S ARM: 7818/1: feroceon: Add suspend/resume operation 2013-08-20 00:12:52 +01:00
proc-macros.S ARM: 7773/1: PJ4B: Add support for errata 4742 2013-06-24 14:28:46 +01:00
proc-mohawk.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-sa110.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-sa1100.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-syms.c ARM: modules: don't export cpu_set_pte_ext when !MMU 2013-03-26 09:55:34 +00:00
proc-v6.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-v7-2level.S ARM: 7784/1: mm: ensure SMP alternates assemble to exactly 4 bytes with Thumb-2 2013-07-22 14:29:09 +01:00
proc-v7-3level.S ARM: 7784/1: mm: ensure SMP alternates assemble to exactly 4 bytes with Thumb-2 2013-07-22 14:29:09 +01:00
proc-v7.S Merge branches 'debug-choice', 'devel-stable' and 'misc' into for-linus 2013-09-05 10:34:15 +01:00
proc-v7m.S ARM: ARMv7-M: implement read_cpuid_ext 2013-05-17 11:44:40 +02:00
proc-xsc3.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
proc-xscale.S arm: delete __cpuinit/__CPUINIT usage from all ARM users 2013-07-14 19:36:52 -04:00
tcm.h ARM: 7694/1: ARM, TCM: initialize TCM in paging_init(), instead of setup_arch() 2013-04-17 16:53:24 +01:00
tlb-fa.S
tlb-v4.S
tlb-v4wb.S
tlb-v4wbi.S
tlb-v6.S
tlb-v7.S ARM: mm: use inner-shareable barriers for TLB and user cache operations 2013-08-12 12:25:45 +01:00