linux-kernel - [PATCH 4/4] s390/hugetlb: add hugepages

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Message-Id: <1435927569-41132-5-git-send-email-dingel@linux.vnet.ibm.com>
Date:	Fri,  3 Jul 2015 14:46:09 +0200
From:	Dominik Dingel <dingel@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, Dominik Dingel <dingel@...ux.vnet.ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Michael Holzheu <holzheu@...ux.vnet.ibm.com>,
	linux-s390@...r.kernel.org, linux-mm@...ck.org,
	Gerald Schaefer <gerald.schaefer@...ibm.com>
Subject: [PATCH 4/4] 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@...ux.vnet.ibm.com>
---
 arch/s390/include/asm/hugetlb.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h
index 0130d03..d9be7c0 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);
-- 
2.3.8

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