The patch titled
Subject: mm: hugetlb: allow hugepages_supported to be architecture specific
has been added to the -mm tree. Its filename is
mm-hugetlb-allow-hugepages_supported-to-be-architecture-specific.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hugetlb-allow-hugepages_supported-to-be-architecture-specific.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hugetlb-allow-hugepages_supported-to-be-architecture-specific.patch
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From: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>
Subject: mm: hugetlb: allow hugepages_supported to be architecture specific
s390 has a constant hugepage size, by setting HPAGE_SHIFT we also
change e.g. the pageblock_order, which should be independent in
respect to hugepage support.
With this patch every architecture is free to define how to check
for hugepage support.
Signed-off-by: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/hugetlb.h | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff -puN include/linux/hugetlb.h~mm-hugetlb-allow-hugepages_supported-to-be-architecture-specific include/linux/hugetlb.h
--- a/include/linux/hugetlb.h~mm-hugetlb-allow-hugepages_supported-to-be-architecture-specific
+++ a/include/linux/hugetlb.h
@@ -460,15 +460,14 @@ static inline spinlock_t *huge_pte_lockp
return &mm->page_table_lock;
}
-static inline bool hugepages_supported(void)
-{
- /*
- * Some platform decide whether they support huge pages at boot
- * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
- * there is no such support
- */
- return HPAGE_SHIFT != 0;
-}
+#ifndef hugepages_supported
+/*
+ * Some platform decide whether they support huge pages at boot
+ * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0
+ * when there is no such support
+ */
+#define hugepages_supported() (HPAGE_SHIFT != 0)
+#endif
#else /* CONFIG_HUGETLB_PAGE */
struct hstate {};
_
Patches currently in -mm which might be from dingel@xxxxxxxxxxxxxxxxxx are
revert-s390-mm-change-hpage_shift-type-to-int.patch
revert-s390-mm-make-hugepages_supported-a-boot-time-decision.patch
mm-hugetlb-allow-hugepages_supported-to-be-architecture-specific.patch
s390-hugetlb-add-hugepages_supported-define.patch
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