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authorAndrea Arcangeli <aarcange@redhat.com>2011-01-25 18:07:25 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-25 19:50:02 -0500
commit33a938774fdb9933e9c77504b035f4f87c0859df (patch)
treefad15b1b98845672b130c6b5e5fb26dcb2f2aef1 /mm/Kconfig
parent8dba474f034c322d96ada39cb20cac711d80dcb2 (diff)
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>
Diffstat (limited to 'mm/Kconfig')
-rw-r--r--mm/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 3ad483bdf505..e9c0c61f2ddd 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -179,7 +179,7 @@ config SPLIT_PTLOCK_CPUS
179config COMPACTION 179config COMPACTION
180 bool "Allow for memory compaction" 180 bool "Allow for memory compaction"
181 select MIGRATION 181 select MIGRATION
182 depends on EXPERIMENTAL && HUGETLB_PAGE && MMU 182 depends on MMU
183 help 183 help
184 Allows the compaction of memory for the allocation of huge pages. 184 Allows the compaction of memory for the allocation of huge pages.
185 185