Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

Pull Tile arch updates from Chris Metcalf:
 "These changes bring in a bunch of new functionality that has been
  maintained internally at Tilera over the last year, plus other stray
  bits of work that I've taken into the tile tree from other folks.

  The changes include some PCI root complex work, interrupt-driven
  console support, support for performing fast-path unaligned data
  fixups by kernel-based JIT code generation, CONFIG_PREEMPT support,
  vDSO support for gettimeofday(), a serial driver for the tilegx
  on-chip UART, KGDB support, more optimized string routines, support
  for ftrace and kprobes, improved ASLR, and many bug fixes.

  We also remove support for the old TILE64 chip, which is no longer
  buildable"

* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: (85 commits)
  tile: refresh tile defconfig files
  tile: rework <asm/cmpxchg.h>
  tile PCI RC: make default consistent DMA mask 32-bit
  tile: add null check for kzalloc in tile/kernel/setup.c
  tile: make __write_once a synonym for __read_mostly
  tile: remove support for TILE64
  tile: use asm-generic/bitops/builtin-*.h
  tile: eliminate no-op "noatomichash" boot argument
  tile: use standard tile_bundle_bits type in traps.c
  tile: simplify code referencing hypervisor API addresses
  tile: change <asm/system.h> to <asm/switch_to.h> in comments
  tile: mark pcibios_init() as __init
  tile: check for correct compiler earlier in asm-offsets.c
  tile: use standard 'generic-y' model for <asm/hw_irq.h>
  tile: use asm-generic version of <asm/local64.h>
  tile PCI RC: add comment about "PCI hole" problem
  tile: remove DEBUG_EXTRA_FLAGS kernel config option
  tile: add virt_to_kpte() API and clean up and document behavior
  tile: support FRAME_POINTER
  tile: support reporting Tilera hypervisor statistics
  ...

1 files changed, 29 insertions, 32 deletions

diff --git a/arch/tile/include/asm/page.h b/arch/tile/include/asm/page.h
index dd033a4..6346888 100644
--- a/arch/tile/include/asm/page.h
+++ b/arch/tile/include/asm/page.h
@@ -39,6 +39,12 @@
 #define HPAGE_MASK	(~(HPAGE_SIZE - 1))
 
 /*
+ * We do define AT_SYSINFO_EHDR to support vDSO,
+ * but don't use the gate mechanism.
+ */
+#define __HAVE_ARCH_GATE_AREA		1
+
+/*
  * If the Kconfig doesn't specify, set a maximum zone order that
  * is enough so that we can create huge pages from small pages given
  * the respective sizes of the two page types.  See <linux/mmzone.h>.
@@ -142,8 +148,12 @@ static inline __attribute_const__ int get_order(unsigned long size)
 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 #endif
 
+/* Allow overriding how much VA or PA the kernel will use. */
+#define MAX_PA_WIDTH CHIP_PA_WIDTH()
+#define MAX_VA_WIDTH CHIP_VA_WIDTH()
+
 /* Each memory controller has PAs distinct in their high bits. */
-#define NR_PA_HIGHBIT_SHIFT (CHIP_PA_WIDTH() - CHIP_LOG_NUM_MSHIMS())
+#define NR_PA_HIGHBIT_SHIFT (MAX_PA_WIDTH - CHIP_LOG_NUM_MSHIMS())
 #define NR_PA_HIGHBIT_VALUES (1 << CHIP_LOG_NUM_MSHIMS())
 #define __pa_to_highbits(pa) ((phys_addr_t)(pa) >> NR_PA_HIGHBIT_SHIFT)
 #define __pfn_to_highbits(pfn) ((pfn) >> (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT))
@@ -154,7 +164,7 @@ static inline __attribute_const__ int get_order(unsigned long size)
  * We reserve the lower half of memory for user-space programs, and the
  * upper half for system code.  We re-map all of physical memory in the
  * upper half, which takes a quarter of our VA space.  Then we have
- * the vmalloc regions.  The supervisor code lives at 0xfffffff700000000,
+ * the vmalloc regions.  The supervisor code lives at the highest address,
  * with the hypervisor above that.
  *
  * Loadable kernel modules are placed immediately after the static
@@ -166,26 +176,19 @@ static inline __attribute_const__ int get_order(unsigned long size)
  * Similarly, for now we don't play any struct page mapping games.
  */
 
-#if CHIP_PA_WIDTH() + 2 > CHIP_VA_WIDTH()
+#if MAX_PA_WIDTH + 2 > MAX_VA_WIDTH
 # error Too much PA to map with the VA available!
 #endif
-#define HALF_VA_SPACE           (_AC(1, UL) << (CHIP_VA_WIDTH() - 1))
 
-#define MEM_LOW_END		(HALF_VA_SPACE - 1)         /* low half */
-#define MEM_HIGH_START		(-HALF_VA_SPACE)            /* high half */
-#define PAGE_OFFSET		MEM_HIGH_START
-#define FIXADDR_BASE		_AC(0xfffffff400000000, UL) /* 4 GB */
-#define FIXADDR_TOP		_AC(0xfffffff500000000, UL) /* 4 GB */
+#define PAGE_OFFSET		(-(_AC(1, UL) << (MAX_VA_WIDTH - 1)))
+#define KERNEL_HIGH_VADDR	_AC(0xfffffff800000000, UL)  /* high 32GB */
+#define FIXADDR_BASE		(KERNEL_HIGH_VADDR - 0x400000000) /* 4 GB */
+#define FIXADDR_TOP		(KERNEL_HIGH_VADDR - 0x300000000) /* 4 GB */
 #define _VMALLOC_START		FIXADDR_TOP
-#define HUGE_VMAP_BASE		_AC(0xfffffff600000000, UL) /* 4 GB */
-#define MEM_SV_START		_AC(0xfffffff700000000, UL) /* 256 MB */
-#define MEM_SV_INTRPT		MEM_SV_START
-#define MEM_MODULE_START	_AC(0xfffffff710000000, UL) /* 256 MB */
+#define HUGE_VMAP_BASE		(KERNEL_HIGH_VADDR - 0x200000000) /* 4 GB */
+#define MEM_SV_START		(KERNEL_HIGH_VADDR - 0x100000000) /* 256 MB */
+#define MEM_MODULE_START	(MEM_SV_START + (256*1024*1024)) /* 256 MB */
 #define MEM_MODULE_END		(MEM_MODULE_START + (256*1024*1024))
-#define MEM_HV_START		_AC(0xfffffff800000000, UL) /* 32 GB */
-
-/* Highest DTLB address we will use */
-#define KERNEL_HIGH_VADDR	MEM_SV_START
 
 #else /* !__tilegx__ */
 
@@ -207,25 +210,18 @@ static inline __attribute_const__ int get_order(unsigned long size)
  * values, and after that, we show "typical" values, since the actual
  * addresses depend on kernel #defines.
  *
- * MEM_HV_INTRPT                   0xfe000000
- * MEM_SV_INTRPT (kernel code)     0xfd000000
+ * MEM_HV_START                    0xfe000000
+ * MEM_SV_START  (kernel code)     0xfd000000
  * MEM_USER_INTRPT (user vector)   0xfc000000
- * FIX_KMAP_xxx                    0xf8000000 (via NR_CPUS * KM_TYPE_NR)
- * PKMAP_BASE                      0xf7000000 (via LAST_PKMAP)
- * HUGE_VMAP                       0xf3000000 (via CONFIG_NR_HUGE_VMAPS)
- * VMALLOC_START                   0xf0000000 (via __VMALLOC_RESERVE)
+ * FIX_KMAP_xxx                    0xfa000000 (via NR_CPUS * KM_TYPE_NR)
+ * PKMAP_BASE                      0xf9000000 (via LAST_PKMAP)
+ * VMALLOC_START                   0xf7000000 (via VMALLOC_RESERVE)
  * mapped LOWMEM                   0xc0000000
  */
 
 #define MEM_USER_INTRPT		_AC(0xfc000000, UL)
-#if CONFIG_KERNEL_PL == 1
-#define MEM_SV_INTRPT		_AC(0xfd000000, UL)
-#define MEM_HV_INTRPT		_AC(0xfe000000, UL)
-#else
-#define MEM_GUEST_INTRPT	_AC(0xfd000000, UL)
-#define MEM_SV_INTRPT		_AC(0xfe000000, UL)
-#define MEM_HV_INTRPT		_AC(0xff000000, UL)
-#endif
+#define MEM_SV_START		_AC(0xfd000000, UL)
+#define MEM_HV_START		_AC(0xfe000000, UL)
 
 #define INTRPT_SIZE		0x4000
 
@@ -246,7 +242,7 @@ static inline __attribute_const__ int get_order(unsigned long size)
 
 #endif /* __tilegx__ */
 
-#ifndef __ASSEMBLY__
+#if !defined(__ASSEMBLY__) && !defined(VDSO_BUILD)
 
 #ifdef CONFIG_HIGHMEM
 
@@ -332,6 +328,7 @@ static inline int pfn_valid(unsigned long pfn)
 
 struct mm_struct;
 extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
+extern pte_t *virt_to_kpte(unsigned long kaddr);
 
 #endif /* !__ASSEMBLY__ */