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| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2015-07-17 16:23:39 -0700 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-05-10 12:20:19 -0400 |
| commit | baa806a8577e0d8b1d5a0ccbf735ceedb3a6bcfe (patch) | |
| tree | 0c133175d2d26c0be69fafc88453c79ca3cdb5f1 /arch/s390 | |
| parent | e583da6d2b7a035f1c8a526da37b1b8b3bb59166 (diff) | |
| download | linux-rt-baa806a8577e0d8b1d5a0ccbf735ceedb3a6bcfe.tar.gz | |
s390/hugetlb: add hugepages_supported define
[ Upstream commit 7f9be77555bb2e52de84e9dddf7b4eb20cc6e171 ]
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@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/hugetlb.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h index 11eae5f55b70..9787b61e0758 100644 --- a/arch/s390/include/asm/hugetlb.h +++ b/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); |