linux-kernel - [PATCH 3.16 039/114] mm: hugetlb: allow hugepages

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Message-ID: <lsq.1465842997.627885140@decadent.org.uk>
Date:	Mon, 13 Jun 2016 19:36:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Dominik Dingel" <dingel@...ux.vnet.ibm.com>,
	"Christian Borntraeger" <borntraeger@...ibm.com>,
	"Michael Holzheu" <holzheu@...ux.vnet.ibm.com>,
	"Heiko Carstens" <heiko.carstens@...ibm.com>,
	"Martin Schwidefsky" <schwidefsky@...ibm.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Gerald Schaefer" <gerald.schaefer@...ibm.com>
Subject: [PATCH 3.16 039/114] mm: hugetlb: allow hugepages_supported to be
 architecture specific

3.16.36-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dominik Dingel <dingel@...ux.vnet.ibm.com>

commit 2531c8cf56a640cd7d17057df8484e570716a450 upstream.

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>
Acked-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Christian Borntraeger <borntraeger@...ibm.com>
Cc: Michael Holzheu <holzheu@...ux.vnet.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/hugetlb.h | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -416,15 +416,14 @@ static inline spinlock_t *huge_pte_lockp
 	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 {};