linux-ext4 - [WIP 12/18] Additional macros for pmd operations

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Date:	Thu, 16 Feb 2012 15:47:51 +0100
From:	Radosław Smogura <mail@...gura.eu>
To:	linux-mm@...ck.org
Cc:	Yongqiang Yang <xiaoqiangnk@...il.com>, mail@...gura.eu,
	linux-ext4@...r.kernel.org
Subject: [WIP 12/18] Additional macros for pmd operations

Macros for operating on pmd in simillar way like for pte.

Signed-off-by: Radosław Smogura <mail@...gura.eu>
---
 arch/x86/include/asm/pgtable.h |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 49afb3f..38fd008 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -265,6 +265,11 @@ static inline pmd_t pmd_wrprotect(pmd_t pmd)
 	return pmd_clear_flags(pmd, _PAGE_RW);
 }
 
+static inline int pmd_dirty(pmd_t pmd)
+{
+	return pmd_flags(pmd) & _PAGE_DIRTY;
+}
+
 static inline pmd_t pmd_mkdirty(pmd_t pmd)
 {
 	return pmd_set_flags(pmd, _PAGE_DIRTY);
@@ -285,6 +290,11 @@ static inline pmd_t pmd_mkwrite(pmd_t pmd)
 	return pmd_set_flags(pmd, _PAGE_RW);
 }
 
+static inline pmd_t pmd_writeprotect(pmd_t pmd)
+{
+	return pmd_clear_flags(pmd, _PAGE_RW);
+}
+
 static inline pmd_t pmd_mknotpresent(pmd_t pmd)
 {
 	return pmd_clear_flags(pmd, _PAGE_PRESENT);
@@ -731,6 +741,17 @@ static inline int pmd_write(pmd_t pmd)
 	return pmd_flags(pmd) & _PAGE_RW;
 }
 
+#define __HAVE_ARCH_PMD_EXEC
+static inline int pmd_exec(pmd_t pmd)
+{
+	return !(pmd_flags(pmd) & _PAGE_NX);
+}
+
+static inline void pmd_mkexec(pmd_t pmd)
+{
+	pmd_clear_flags(pmd, _PAGE_NX);
+}
+
 #define __HAVE_ARCH_PMDP_GET_AND_CLEAR
 static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm, unsigned long addr,
 				       pmd_t *pmdp)
-- 
1.7.3.4

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