mm, swap: make CONFIG_THP_SWAP depend on CONFIG_SWAP
CONFIG_THP_SWAP should depend on CONFIG_SWAP, because it's unreasonable to optimize swapping for THP (Transparent Huge Page) without basic swapping support. In original code, when CONFIG_SWAP=n and CONFIG_THP_SWAP=y, split_swap_cluster() will not be built because it is in swapfile.c, but it will be called in huge_memory.c. This doesn't trigger a build error in practice because the call site is enclosed by PageSwapCache(), which is defined to be constant 0 when CONFIG_SWAP=n. But this is fragile and should be fixed. The comments are fixed too to reflect the latest progress. Link: http://lkml.kernel.org/r/20180713021228.439-1-ying.huang@intel.com Fixes: 38d8b4e6 ("mm, THP, swap: delay splitting THP during swap out") Signed-off-by:"Huang, Ying" <ying.huang@intel.com> Reviewed-by:
Dan Williams <dan.j.williams@intel.com> Reviewed-by:
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Shaohua Li <shli@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@redhat.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Zi Yan <zi.yan@cs.rutgers.edu> Cc: Daniel Jordan <daniel.m.jordan@oracle.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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