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Date: Wed, 14 Aug 2013 11:00:59 +0400
From: Cyrill Gorcunov <gorcunov@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: "H. Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...capital.net>,
Pavel Emelyanov <xemul@...allels.com>,
Matt Mackall <mpm@...enic.com>,
Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
Marcelo Tosatti <mtosatti@...hat.com>,
KOSAKI Motohiro <kosaki.motohiro@...il.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Peter Zijlstra <peterz@...radead.org>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...e.hu>
Subject: [PATCH -mm] mm: Unify pte_to_pgoff and pgoff_to_pte helpers
Use unified pte_bfop helper to manipulate bits in pte/pgoff bitfield.
Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Pavel Emelyanov <xemul@...allels.com>
Cc: Matt Mackall <mpm@...enic.com>
Cc: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...e.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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