linux-kernel - [PATCH 3.16 078/131] mn10300: drop _PAGE_FILE and pte

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Message-ID: <lsq.1538257387.270814758@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, "David Howells" <dhowells@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Koichi Yasutake" <yasutake.koichi@...panasonic.com>,
        "Hugh Dickins" <hughd@...gle.com>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: [PATCH 3.16 078/131] mn10300: 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 6bf63a8ccb1dccd6ab81bc8bc46863493629cdb8 upstream.

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

This patch also increases the number of bits availble for swap offset.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: David Howells <dhowells@...hat.com>
Cc: Koichi Yasutake <yasutake.koichi@...panasonic.com>
Cc: Hugh Dickins <hughd@...gle.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/mn10300/include/asm/pgtable.h | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

--- a/arch/mn10300/include/asm/pgtable.h
+++ b/arch/mn10300/include/asm/pgtable.h
@@ -134,7 +134,6 @@ extern pte_t kernel_vmalloc_ptes[(VMALLO
 #define _PAGE_NX		0			/* no-execute bit */
 
 /* If _PAGE_VALID is clear, we use these: */
-#define _PAGE_FILE		xPTEL2_C	/* set:pagecache unset:swap */
 #define _PAGE_PROTNONE		0x000		/* If not present */
 
 #define __PAGE_PROT_UWAUX	0x010
@@ -241,11 +240,6 @@ static inline int pte_young(pte_t pte)	{
 static inline int pte_write(pte_t pte)	{ return pte_val(pte) & __PAGE_PROT_WRITE; }
 static inline int pte_special(pte_t pte){ return 0; }
 
-/*
- * The following only works if pte_present() is not true.
- */
-static inline int pte_file(pte_t pte)	{ return pte_val(pte) & _PAGE_FILE; }
-
 static inline pte_t pte_rdprotect(pte_t pte)
 {
 	pte_val(pte) &= ~(__PAGE_PROT_USER|__PAGE_PROT_UWAUX); return pte;
@@ -338,16 +332,11 @@ static inline int pte_exec_kernel(pte_t
 	return 1;
 }
 
-#define PTE_FILE_MAX_BITS	30
-
-#define pte_to_pgoff(pte)	(pte_val(pte) >> 2)
-#define pgoff_to_pte(off)	__pte((off) << 2 | _PAGE_FILE)
-
 /* Encode and de-code a swap entry */
-#define __swp_type(x)			(((x).val >> 2) & 0x3f)
-#define __swp_offset(x)			((x).val >> 8)
+#define __swp_type(x)			(((x).val >> 1) & 0x3f)
+#define __swp_offset(x)			((x).val >> 7)
 #define __swp_entry(type, offset) \
-	((swp_entry_t) { ((type) << 2) | ((offset) << 8) })
+	((swp_entry_t) { ((type) << 1) | ((offset) << 7) })
 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)		__pte((x).val)