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Naoya Horiguchi
c177c81e09
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 <[email protected]> Reported-by: Michael Ellerman <[email protected]> Tested-by: Michael Ellerman <[email protected]> Acked-by: Hugh Dickins <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Tony Luck <[email protected]> Cc: Russell King <[email protected]> Cc: Martin Schwidefsky <[email protected]> Cc: James Hogan <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: David Miller <[email protected]> Cc: <[email protected]> [3.12+] Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>