mm: compaction: don't depend on HUGETLB_PAGE
commit33a938774fdb9933e9c77504b035f4f87c0859df
authorAndrea Arcangeli <aarcange@redhat.com>
Tue, 25 Jan 2011 23:07:25 +0000 (25 15:07 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 26 Jan 2011 00:50:02 +0000 (26 10:50 +1000)
treefad15b1b98845672b130c6b5e5fb26dcb2f2aef1
parent8dba474f034c322d96ada39cb20cac711d80dcb2
mm: compaction: don't depend on HUGETLB_PAGE

Commit 5d6892407 ("thp: select CONFIG_COMPACTION if TRANSPARENT_HUGEPAGE
enabled") causes this warning during the configuration process:

  warning: (TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet
  direct dependencies (EXPERIMENTAL && HUGETLB_PAGE && MMU)

COMPACTION doesn't depend on HUGETLB_PAGE, it doesn't depend on THP
either, it is also useful for regular alloc_pages(order > 0) including
the very kernel stack during fork (THREAD_ORDER = 1).  It's always
better to enable COMPACTION.

The warning should be an error because we would end up with MIGRATION
not selected, and COMPACTION wouldn't work without migration (despite it
seems to build with an inline migrate_pages returning -ENOSYS).

I'd also like to remove EXPERIMENTAL: compaction has been in the kernel
for some releases (for full safety the default remains disabled which I
think is enough).

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Reported-by: Luca Tettamanti <kronos.it@gmail.com>
Tested-by: Luca Tettamanti <kronos.it@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/Kconfig