]> git.karo-electronics.de Git - karo-tx-linux.git/commit
hugetlb: restrict hugepage_migration_support() to x86_64
authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Wed, 4 Jun 2014 23:05:35 +0000 (16:05 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 1 Jul 2014 03:11:53 +0000 (20:11 -0700)
commit9dbfe4e4a6b45aa5d5e67407445cf7bd4bcffcfc
tree424943a70993a8d6b20f3a4084655b61e4b2cdc4
parent683ba9dcad6a409736b635efa740679e42210935
hugetlb: restrict hugepage_migration_support() to x86_64

commit c177c81e09e517bbf75b67762cdab1b83aba6976 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>
15 files changed:
arch/arm/mm/hugetlbpage.c
arch/arm64/mm/hugetlbpage.c
arch/ia64/mm/hugetlbpage.c
arch/metag/mm/hugetlbpage.c
arch/mips/mm/hugetlbpage.c
arch/powerpc/mm/hugetlbpage.c
arch/s390/mm/hugetlbpage.c
arch/sh/mm/hugetlbpage.c
arch/sparc/mm/hugetlbpage.c
arch/tile/mm/hugetlbpage.c
arch/x86/Kconfig
arch/x86/mm/hugetlbpage.c
include/linux/hugetlb.h
include/linux/mempolicy.h
mm/Kconfig