s390/hugetlb: add hugepages_supported define
authorDominik Dingel <dingel@linux.vnet.ibm.com>
Fri, 17 Jul 2015 23:23:39 +0000 (16:23 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 17 Jul 2015 23:39:52 +0000 (16:39 -0700)
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

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>

index 0130d03..d9be7c0 100644 (file)
@@ -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);