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linux/arch/sh
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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>
History 2014-06-30 20:11:53 -07:00
..
boards Input: i8042 - select ARCH_MIGHT_HAVE_PC_SERIO for SH_CAYMAN 2014-01-02 15:48:21 -08:00
boot Kbuild: centralize MKIMAGE and cmd_uimage definitions 2012-03-26 15:49:20 +02:00
cchips sh: hd64461: Migrate off of deprecated dynamic IRQ API. 2012-05-18 23:20:09 +09:00
configs PCI: hotplug: Convert to be builtin only, not modular 2013-07-25 14:11:06 -06:00
drivers PCI: Delay enabling bridges until they're needed 2013-07-25 12:35:03 -06:00
include sh: prefix sh-specific "CCR" and "CCR2" by "SH_" 2014-03-04 07:55:49 -08:00
kernel sh: fix format string bug in stack tracer 2014-05-06 07:59:34 -07:00
lib sh: always link in helper functions extracted from libgcc 2013-12-18 19:04:51 -08:00
lib64 sh64: Kill off old exception debugging helpers. 2012-06-14 14:12:18 +09:00
math-emu Disintegrate asm/system.h for SH 2012-03-28 18:30:03 +01:00
mm hugetlb: restrict hugepage_migration_support() to x86_64 2014-06-30 20:11:53 -07:00
oprofile oprofile, arm/sh: Fix oprofile_arch_exit() linkage issue 2011-12-23 11:58:34 +01:00
tools sh: Add RSK2+SH7269 board 2012-05-10 17:20:01 +09:00
Kconfig Kconfig: update flightly outdated CONFIG_SMP documentation 2014-01-23 16:37:01 -08:00
Kconfig.cpu arch/sh: remove depends on CONFIG_EXPERIMENTAL 2013-01-21 14:43:13 -08:00
Kconfig.debug sh: dwarf unwinder depends on SHcompact. 2012-03-30 19:31:22 +09:00
Makefile stackprotector: Unify the HAVE_CC_STACKPROTECTOR logic between architectures 2013-12-20 09:38:40 +01:00