From c819f37e7e174d68cd013abf33725b4e07ced023 Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@suse.de>
Date: Thu, 12 Feb 2015 14:58:38 -0800
Subject: [PATCH] x86: mm: restore original pte_special check
Commit b38af4721f59 ("x86,mm: fix pte_special versus pte_numa") adjusted
the pte_special check to take into account that a special pte had
SPECIAL and neither PRESENT nor PROTNONE. Now that NUMA hinting PTEs
are no longer modifying _PAGE_PRESENT it should be safe to restore the
original pte_special behaviour.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Dave Jones <davej@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Kirill Shutemov <kirill.shutemov@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/x86/include/asm/pgtable.h | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 34d42a7d55955..67fc3d2b0aabe 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -132,13 +132,7 @@ static inline int pte_exec(pte_t pte)
static inline int pte_special(pte_t pte)
{
- /*
- * See CONFIG_NUMA_BALANCING pte_numa in include/asm-generic/pgtable.h.
- * On x86 we have _PAGE_BIT_NUMA == _PAGE_BIT_GLOBAL+1 ==
- * __PAGE_BIT_SOFTW1 == _PAGE_BIT_SPECIAL.
- */
- return (pte_flags(pte) & _PAGE_SPECIAL) &&
- (pte_flags(pte) & (_PAGE_PRESENT|_PAGE_PROTNONE));
+ return pte_flags(pte) & _PAGE_SPECIAL;
}
static inline unsigned long pte_pfn(pte_t pte)
--
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