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linux/arch/tile
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Naoya Horiguchi 9dbfe4e4a6 hugetlb: restrict hugepage_migration_support() to x86_64 
commit c177c81e09 upstream.

Currently hugepage migration is available for all archs which support
pmd-level hugepage, but testing is done only for x86_64 and there're
bugs for other archs.  So to avoid breaking such archs, this patch
limits the availability strictly to x86_64 until developers of other
archs get interested in enabling this feature.

Simply disabling hugepage migration on non-x86_64 archs is not enough to
fix the reported problem where sys_move_pages() hits the BUG_ON() in
follow_page(FOLL_GET), so let's fix this by checking if hugepage
migration is supported in vma_migratable().

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-06-30 20:11:53 -07:00
..
configs tile: refresh tile defconfig files 2013-09-06 13:06:30 -04:00
gxio tile: improve gxio iorpc autogenerated code style 2013-09-16 15:47:20 -04:00
include tile: remove compat_sys_lookup_dcookie declaration to fix compile error 2014-02-01 10:55:15 -08:00
kernel PCI changes for the v3.13 merge window: 2013-11-14 14:02:00 +09:00
kvm arch/tile/kvm: remove depends on CONFIG_EXPERIMENTAL 2013-01-17 12:11:26 -08:00
lib tile: include: asm: use 'long long' instead of 'u64' for atomic64_t and its related functions 2013-09-27 16:08:56 -04:00
mm hugetlb: restrict hugepage_migration_support() to x86_64 2014-06-30 20:11:53 -07:00
Kbuild
Kconfig kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS 2013-11-15 09:32:22 +09:00
Kconfig.debug tile: remove DEBUG_EXTRA_FLAGS kernel config option 2013-09-03 14:52:17 -04:00
Makefile tile: remove DEBUG_EXTRA_FLAGS kernel config option 2013-09-03 14:52:17 -04:00