[PATCH -mm] mm: Unify pte_to_pgoff and pgoff_to_pte helpers

[Cyrill Gorcunov <gorcunov@gmail.com>]

Use unified pte_bfop helper to manipulate bits in pte/pgoff bitfield.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Matt Mackall <mpm@selenic.com>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/include/asm/pgtable-2level.h |   51 ++++++++++++++++++----------------
 1 file changed, 27 insertions(+), 24 deletions(-)

Index: linux-2.6.git/arch/x86/include/asm/pgtable-2level.h
===================================================================
--- linux-2.6.git.orig/arch/x86/include/asm/pgtable-2level.h
+++ linux-2.6.git/arch/x86/include/asm/pgtable-2level.h
@@ -55,8 +55,11 @@ static inline pmd_t native_pmdp_get_and_
 #define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
 #endif
 
-#define _mfrob(v,r,m,l)		((((v) >> (r)) & (m)) << (l))
-#define __frob(v,r,l)		(((v) >> (r)) << (l))
+/*
+ * For readable bitfield manipulations.
+ */
+#define PTE_FILE_NOMASK		(-1U)
+#define pte_bfop(v,r,m,l)	((((v) >> (r)) & (m)) << (l))
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 
@@ -82,18 +85,18 @@ static inline pmd_t native_pmdp_get_and_
 #define PTE_FILE_LSHIFT3	(PTE_FILE_BITS1 + PTE_FILE_BITS2)
 #define PTE_FILE_LSHIFT4	(PTE_FILE_BITS1 + PTE_FILE_BITS2 + PTE_FILE_BITS3)
 
-#define pte_to_pgoff(pte)							    \
-	(_mfrob((pte).pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0)		  + \
-	 _mfrob((pte).pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) + \
-	 _mfrob((pte).pte_low, PTE_FILE_SHIFT3, PTE_FILE_MASK3, PTE_FILE_LSHIFT3) + \
-	 __frob((pte).pte_low, PTE_FILE_SHIFT4, PTE_FILE_LSHIFT4))
-
-#define pgoff_to_pte(off)							\
-	((pte_t) { .pte_low =							\
-	_mfrob(off,                0, PTE_FILE_MASK1, PTE_FILE_SHIFT1)	+	\
-	_mfrob(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2)	+	\
-	_mfrob(off, PTE_FILE_LSHIFT3, PTE_FILE_MASK3, PTE_FILE_SHIFT3)	+	\
-	__frob(off, PTE_FILE_LSHIFT4, PTE_FILE_SHIFT4)			+	\
+#define pte_to_pgoff(pte)								  \
+	(pte_bfop((pte).pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0)			+ \
+	 pte_bfop((pte).pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2)	+ \
+	 pte_bfop((pte).pte_low, PTE_FILE_SHIFT3, PTE_FILE_MASK3, PTE_FILE_LSHIFT3)	+ \
+	 pte_bfop((pte).pte_low, PTE_FILE_SHIFT4, PTE_FILE_NOMASK, PTE_FILE_LSHIFT4))
+
+#define pgoff_to_pte(off)							  \
+	((pte_t) { .pte_low =							  \
+	pte_bfop(off,                0, PTE_FILE_MASK1, PTE_FILE_SHIFT1)	+ \
+	pte_bfop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2)	+ \
+	pte_bfop(off, PTE_FILE_LSHIFT3, PTE_FILE_MASK3, PTE_FILE_SHIFT3)	+ \
+	pte_bfop(off, PTE_FILE_LSHIFT4, PTE_FILE_NOMASK, PTE_FILE_SHIFT4)	+ \
 	_PAGE_FILE })
 
 #else /* CONFIG_MEM_SOFT_DIRTY */
@@ -120,16 +123,16 @@ static inline pmd_t native_pmdp_get_and_
 #define PTE_FILE_LSHIFT2	(PTE_FILE_BITS1)
 #define PTE_FILE_LSHIFT3	(PTE_FILE_BITS1 + PTE_FILE_BITS2)
 
-#define pte_to_pgoff(pte)							    \
-	(_mfrob((pte).pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0)		  + \
-	 _mfrob((pte).pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) + \
-	 __frob((pte).pte_low, PTE_FILE_SHIFT3, PTE_FILE_LSHIFT3))
-
-#define pgoff_to_pte(off)							\
-	((pte_t) { .pte_low =							\
-	_mfrob(off,                0, PTE_FILE_MASK1, PTE_FILE_SHIFT1)	+	\
-	_mfrob(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2)	+	\
-	__frob(off, PTE_FILE_LSHIFT3, PTE_FILE_SHIFT3)			+	\
+#define pte_to_pgoff(pte)								  \
+	(pte_bfop((pte).pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0)			+ \
+	 pte_bfop((pte).pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2)	+ \
+	 pte_bfop((pte).pte_low, PTE_FILE_SHIFT3, PTE_FILE_NOMASK, PTE_FILE_LSHIFT3))
+
+#define pgoff_to_pte(off)							  \
+	((pte_t) { .pte_low =							  \
+	pte_bfop(off,                0, PTE_FILE_MASK1, PTE_FILE_SHIFT1)	+ \
+	pte_bfop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2)	+ \
+	pte_bfop(off, PTE_FILE_LSHIFT3, PTE_FILE_NOMASK, PTE_FILE_SHIFT3)	+ \
 	_PAGE_FILE })
 
 #endif /* CONFIG_MEM_SOFT_DIRTY */

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