linux-kernel - [PATCH 3.16 089/131] xtensa: drop _PAGE_FILE and pte

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Message-ID: <lsq.1538257387.404615271@decadent.org.uk>
Date:   Sat, 29 Sep 2018 22:43:07 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Max Filippov" <jcmvbkbc@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 3.16 089/131] xtensa: drop _PAGE_FILE and pte_file()-related
 helpers

3.16.59-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

commit d9ecee281b8f89da6d3203be62802eda991e37cc upstream.

We've replaced remap_file_pages(2) implementation with emulation.  Nobody
creates non-linear mapping anymore.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Acked-by: Max Filippov <jcmvbkbc@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/xtensa/include/asm/pgtable.h | 10 ----------
 1 file changed, 10 deletions(-)

--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -89,8 +89,6 @@
  *   (PAGE_NONE)|    PPN    | 0 | 00 | ADW | 01 | 11 | 11 |
  *		+-----------------------------------------+
  *   swap	|     index     |   type   | 01 | 11 | 00 |
- *		+- - - - - - - - - - - - - - - - - - - - -+
- *   file	|        file offset       | 01 | 11 | 10 |
  *		+-----------------------------------------+
  *
  * For T1050 hardware and earlier the layout differs for present and (PAGE_NONE)
@@ -111,7 +109,6 @@
  *   index      swap offset / PAGE_SIZE (bit 11-31: 21 bits -> 8 GB)
  *		(note that the index is always non-zero)
  *   type       swap type (5 bits -> 32 types)
- *   file offset 26-bit offset into the file, in increments of PAGE_SIZE
  *
  *  Notes:
  *   - (PROT_NONE) is a special case of 'present' but causes an exception for
@@ -144,7 +141,6 @@
 #define _PAGE_HW_VALID		0x00
 #define _PAGE_NONE		0x0f
 #endif
-#define _PAGE_FILE		(1<<1)	/* file mapped page, only if !present */
 
 #define _PAGE_USER		(1<<4)	/* user access (ring=1) */
 
@@ -260,7 +256,6 @@ static inline void pgtable_cache_init(vo
 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; }
 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_file(pte_t pte)  { return pte_val(pte) & _PAGE_FILE; }
 static inline int pte_special(pte_t pte) { return 0; }
 
 static inline pte_t pte_wrprotect(pte_t pte)	
@@ -388,11 +383,6 @@ ptep_set_wrprotect(struct mm_struct *mm,
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#define PTE_FILE_MAX_BITS	26
-#define pte_to_pgoff(pte)	(pte_val(pte) >> 6)
-#define pgoff_to_pte(off)	\
-	((pte_t) { ((off) << 6) | _PAGE_CA_INVALID | _PAGE_FILE | _PAGE_USER })
-
 #endif /*  !defined (__ASSEMBLY__) */