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| author | Dominik Dingel <dingel@linux.vnet.ibm.com> | 2015-07-18 02:23:39 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-07-18 02:39:52 +0300 |
| commit | 7f9be77555bb2e52de84e9dddf7b4eb20cc6e171 (patch) | |
| tree | 2d096255acd6bd7c08b6a68e5253c227d76764d9 /arch | |
| parent | 2531c8cf56a640cd7d17057df8484e570716a450 (diff) | |
| download | linux-7f9be77555bb2e52de84e9dddf7b4eb20cc6e171.tar.xz | |
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@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>
Diffstat (limited to 'arch')
| -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 0130d0379edd..d9be7c0c1291 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); |