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Date: Wed, 24 Dec 2014 14:22:26 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: akpm@...ux-foundation.org
Cc: peterz@...radead.org, mingo@...nel.org, davej@...hat.com,
sasha.levin@...cle.com, hughd@...gle.com, linux-mm@...ck.org,
linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Richard Kuo <rkuo@...eaurora.org>
Subject: [PATCH 18/38] hexagon: drop _PAGE_FILE and pte_file()-related helpers
We've replaced remap_file_pages(2) implementation with emulation.
Nobody creates non-linear mapping anymore.
This patch also increase number of bits availble for swap offset.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Richard Kuo <rkuo@...eaurora.org>
---
arch/hexagon/include/asm/pgtable.h | 60 ++++++++++----------------------------
1 file changed, 16 insertions(+), 44 deletions(-)
diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h
index d8bd54fa431e..6e35e71d2aea 100644
--- a/arch/hexagon/include/asm/pgtable.h
+++ b/arch/hexagon/include/asm/pgtable.h
@@ -62,13 +62,6 @@ extern unsigned long zero_page_mask;
#define _PAGE_ACCESSED (1<<2)
/*
- * _PAGE_FILE is only meaningful if _PAGE_PRESENT is false, while
- * _PAGE_DIRTY is only meaningful if _PAGE_PRESENT is true.
- * So we can overload the bit...
- */
-#define _PAGE_FILE _PAGE_DIRTY /* set: pagecache, unset = swap */
-
-/*
* For now, let's say that Valid and Present are the same thing.
* Alternatively, we could say that it's the "or" of R, W, and X
* permissions.
@@ -456,57 +449,36 @@ static inline int pte_exec(pte_t pte)
#define pgtable_cache_init() do { } while (0)
/*
- * Swap/file PTE definitions. If _PAGE_PRESENT is zero, the rest of the
- * PTE is interpreted as swap information. Depending on the _PAGE_FILE
- * bit, the remaining free bits are eitehr interpreted as a file offset
- * or a swap type/offset tuple. Rather than have the TLB fill handler
- * test _PAGE_PRESENT, we're going to reserve the permissions bits
- * and set them to all zeros for swap entries, which speeds up the
- * miss handler at the cost of 3 bits of offset. That trade-off can
- * be revisited if necessary, but Hexagon processor architecture and
- * target applications suggest a lot of TLB misses and not much swap space.
+ * Swap/file PTE definitions. If _PAGE_PRESENT is zero, the rest of the PTE is
+ * interpreted as swap information. The remaining free bits are interpreted as
+ * swap type/offset tuple. Rather than have the TLB fill handler test
+ * _PAGE_PRESENT, we're going to reserve the permissions bits and set them to
+ * all zeros for swap entries, which speeds up the miss handler at the cost of
+ * 3 bits of offset. That trade-off can be revisited if necessary, but Hexagon
+ * processor architecture and target applications suggest a lot of TLB misses
+ * and not much swap space.
*
* Format of swap PTE:
* bit 0: Present (zero)
- * bit 1: _PAGE_FILE (zero)
- * bits 2-6: swap type (arch independent layer uses 5 bits max)
- * bits 7-9: bits 2:0 of offset
- * bits 10-12: effectively _PAGE_PROTNONE (all zero)
- * bits 13-31: bits 21:3 of swap offset
- *
- * Format of file PTE:
- * bit 0: Present (zero)
- * bit 1: _PAGE_FILE (zero)
- * bits 2-9: bits 7:0 of offset
- * bits 10-12: effectively _PAGE_PROTNONE (all zero)
- * bits 13-31: bits 26:8 of swap offset
+ * bits 1-5: swap type (arch independent layer uses 5 bits max)
+ * bits 6-9: bits 3:0 of offset
+ * bits 10-12: effectively _PAGE_PROTNONE (all zero)
+ * bits 13-31: bits 22:4 of swap offset
*
* The split offset makes some of the following macros a little gnarly,
* but there's plenty of precedent for this sort of thing.
*/
-#define PTE_FILE_MAX_BITS 27
/* Used for swap PTEs */
-#define __swp_type(swp_pte) (((swp_pte).val >> 2) & 0x1f)
+#define __swp_type(swp_pte) (((swp_pte).val >> 1) & 0x1f)
#define __swp_offset(swp_pte) \
- ((((swp_pte).val >> 7) & 0x7) | (((swp_pte).val >> 10) & 0x003ffff8))
+ ((((swp_pte).val >> 6) & 0xf) | (((swp_pte).val >> 9) & 0x7ffff0))
#define __swp_entry(type, offset) \
((swp_entry_t) { \
- ((type << 2) | \
- ((offset & 0x3ffff8) << 10) | ((offset & 0x7) << 7)) })
-
-/* Used for file PTEs */
-#define pte_file(pte) \
- ((pte_val(pte) & (_PAGE_FILE | _PAGE_PRESENT)) == _PAGE_FILE)
-
-#define pte_to_pgoff(pte) \
- (((pte_val(pte) >> 2) & 0xff) | ((pte_val(pte) >> 5) & 0x07ffff00))
-
-#define pgoff_to_pte(off) \
- ((pte_t) { ((((off) & 0x7ffff00) << 5) | (((off) & 0xff) << 2)\
- | _PAGE_FILE) })
+ ((type << 1) | \
+ ((offset & 0x7ffff0) << 9) | ((offset & 0xf) << 6)) })
/* Oh boy. There are a lot of possible arch overrides found in this file. */
#include <asm-generic/pgtable.h>
--
2.1.3
--
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