linux-kernel - [PATCH 3/4] mm: hugetlb: allow hugepages_supported to be architecture specific

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Message-Id: <1435927569-41132-4-git-send-email-dingel@linux.vnet.ibm.com>
Date:	Fri,  3 Jul 2015 14:46:08 +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 3/4] mm: hugetlb: allow hugepages_supported to be architecture specific

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@...ux.vnet.ibm.com>
---
 include/linux/hugetlb.h | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 2050261..d891f94 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -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 {};
-- 
2.3.8

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