The patch titled
mm: compaction: don't depend on HUGETLB_PAGE
has been added to the -mm tree. Its filename is
mm-compaction-dont-depend-on-hugetlb_page.patch
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------------------------------------------------------
Subject: mm: compaction: don't depend on HUGETLB_PAGE
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
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@xxxxxxxxxx>
Reported-by: Luca Tettamanti <kronos.it@xxxxxxxxx>
Tested-by: Luca Tettamanti <kronos.it@xxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/Kconfig~mm-compaction-dont-depend-on-hugetlb_page mm/Kconfig
--- a/mm/Kconfig~mm-compaction-dont-depend-on-hugetlb_page
+++ a/mm/Kconfig
@@ -179,7 +179,7 @@ config SPLIT_PTLOCK_CPUS
config COMPACTION
bool "Allow for memory compaction"
select MIGRATION
- depends on EXPERIMENTAL && HUGETLB_PAGE && MMU
+ depends on MMU
help
Allows the compaction of memory for the allocation of huge pages.
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
thp-fix-paravirt-x86-32bit-nopae.patch
mm-compaction-dont-depend-on-hugetlb_page.patch
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