linux-kernel - [PATCH 58 of 66] don't allow transparent hugepage support without PSE

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Message-Id: <22cb0bee434c44460aac.1288798113@v2.random>
Date:	Wed, 03 Nov 2010 16:28:33 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, Adam Litke <agl@...ibm.com>,
	Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: [PATCH 58 of 66] don't allow transparent hugepage support without PSE

From: Andrea Arcangeli <aarcange@...hat.com>

Archs implementing Transparent Hugepage Support must implement a
function called has_transparent_hugepage to be sure the virtual or
physical CPU supports Transparent Hugepages.

Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
---

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -160,6 +160,11 @@ static inline int pmd_trans_huge(pmd_t p
 {
 	return pmd_val(pmd) & _PAGE_PSE;
 }
+
+static inline int has_transparent_hugepage(void)
+{
+	return cpu_has_pse;
+}
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 
 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -487,7 +487,15 @@ static int __init hugepage_init(void)
 	int err;
 #ifdef CONFIG_SYSFS
 	static struct kobject *hugepage_kobj;
+#endif
 
+	err = -EINVAL;
+	if (!has_transparent_hugepage()) {
+		transparent_hugepage_flags = 0;
+		goto out;
+	}
+
+#ifdef CONFIG_SYSFS
 	err = -ENOMEM;
 	hugepage_kobj = kobject_create_and_add("transparent_hugepage", mm_kobj);
 	if (unlikely(!hugepage_kobj)) {
--
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