Revert "UBUNTU: SAUCE: mm: disable vma based swap readahead by default"

This change was to fix an ADT failure. Revert the patch to run a
kernel through testing so we can see if the failure is still an
issue.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

mm/swap_state.c

@@ -38,7 +38,7 @@ static const struct address_space_operations swap_aops = {
 
 struct address_space *swapper_spaces[MAX_SWAPFILES] __read_mostly;
 static unsigned int nr_swapper_spaces[MAX_SWAPFILES] __read_mostly;
-bool swap_vma_readahead __read_mostly = false;
+bool swap_vma_readahead __read_mostly = true;
 
 #define SWAP_RA_WIN_SHIFT	(PAGE_SHIFT / 2)
 #define SWAP_RA_HITS_MASK	((1UL << SWAP_RA_WIN_SHIFT) - 1)