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mm: hugetlb: allow hugepages_supported to be architecture specific

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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@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>
This commit is contained in:
Dominik Dingel 2015-07-17 16:23:37 -07:00 committed by Linus Torvalds
parent 41318bfe2a
commit 2531c8cf56
1 changed files with 8 additions and 9 deletions
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17
include/linux/hugetlb.h
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@ -460,15 +460,14 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
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 {};