The patch titled
Subject: s390/hugetlb: add hugepages_supported define
has been added to the -mm tree. Its filename is
s390-hugetlb-add-hugepages_supported-define.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/s390-hugetlb-add-hugepages_supported-define.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/s390-hugetlb-add-hugepages_supported-define.patch
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From: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx>
Subject: s390/hugetlb: add hugepages_supported define
On s390 we only can enable hugepages if the underlying hardware/hypervisor
also does support this. Common code now would assume this to be signaled
by setting HPAGE_SHIFT to 0. But on s390, where we only support one
hugepage size, there is a link between HPAGE_SHIFT and pageblock_order.
So instead of setting HPAGE_SHIFT to 0, we will implement the check for the
hardware capability.
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>
---
arch/s390/include/asm/hugetlb.h | 1 +
1 file changed, 1 insertion(+)
diff -puN arch/s390/include/asm/hugetlb.h~s390-hugetlb-add-hugepages_supported-define arch/s390/include/asm/hugetlb.h
--- a/arch/s390/include/asm/hugetlb.h~s390-hugetlb-add-hugepages_supported-define
+++ a/arch/s390/include/asm/hugetlb.h
@@ -14,6 +14,7 @@
#define is_hugepage_only_range(mm, addr, len) 0
#define hugetlb_free_pgd_range free_pgd_range
+#define hugepages_supported() (MACHINE_HAS_HPAGE)
void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte);
_
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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