kthread: don't depend on work queues

[safe/jmp/linux-2.6] / include / asm-powerpc / page.h

diff --git a/include/asm-powerpc/page.h b/include/asm-powerpc/page.h
index 94905ba..10c51f4 100644 (file)
--- a/include/asm-powerpc/page.h
+++ b/include/asm-powerpc/page.h
@@ -11,8 +11,8 @@
  */
 
 #ifdef __KERNEL__
-#include <linux/config.h>
 #include <asm/asm-compat.h>
+#include <asm/kdump.h>
 
 /*
  * On PPC32 page size is 4K. For PPC64 we support either 4K or 64K software
@@ -37,18 +37,25 @@
  */
 #define PAGE_MASK      (~((1 << PAGE_SHIFT) - 1))
 
-#define PAGE_OFFSET     ASM_CONST(CONFIG_KERNEL_START)
-#define KERNELBASE      PAGE_OFFSET
+/*
+ * KERNELBASE is the virtual address of the start of the kernel, it's often
+ * the same as PAGE_OFFSET, but _might not be_.
+ *
+ * The kdump dump kernel is one example where KERNELBASE != PAGE_OFFSET.
+ *
+ * To get a physical address from a virtual one you subtract PAGE_OFFSET,
+ * _not_ KERNELBASE.
+ *
+ * If you want to know something's offset from the start of the kernel you
+ * should subtract KERNELBASE.
+ *
+ * If you want to test if something's a kernel address, use is_kernel_addr().
+ */
 
-#ifdef CONFIG_DISCONTIGMEM
-#define page_to_pfn(page)      discontigmem_page_to_pfn(page)
-#define pfn_to_page(pfn)       discontigmem_pfn_to_page(pfn)
-#define pfn_valid(pfn)         discontigmem_pfn_valid(pfn)
-#endif
+#define PAGE_OFFSET     ASM_CONST(CONFIG_KERNEL_START)
+#define KERNELBASE      (PAGE_OFFSET + PHYSICAL_START)
 
 #ifdef CONFIG_FLATMEM
-#define pfn_to_page(pfn)       (mem_map + (pfn))
-#define page_to_pfn(page)      ((unsigned long)((page) - mem_map))
 #define pfn_valid(pfn)         ((pfn) < max_mapnr)
 #endif
 
@@ -56,7 +63,7 @@
 #define pfn_to_kaddr(pfn)      __va((pfn) << PAGE_SHIFT)
 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 
-#define __va(x) ((void *)((unsigned long)(x) + KERNELBASE))
+#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
 
 /*
@@ -114,6 +121,7 @@ typedef struct { pte_t pte; } real_pte_t;
 #endif
 
 /* PMD level */
+#ifdef CONFIG_PPC64
 typedef struct { unsigned long pmd; } pmd_t;
 #define pmd_val(x)     ((x).pmd)
 #define __pmd(x)       ((pmd_t) { (x) })
@@ -123,7 +131,8 @@ typedef struct { unsigned long pmd; } pmd_t;
 typedef struct { unsigned long pud; } pud_t;
 #define pud_val(x)     ((x).pud)
 #define __pud(x)       ((pud_t) { (x) })
-#endif
+#endif /* !CONFIG_PPC_64K_PAGES */
+#endif /* CONFIG_PPC64 */
 
 /* PGD level */
 typedef struct { unsigned long pgd; } pgd_t;
@@ -152,6 +161,7 @@ typedef unsigned long real_pte_t;
 #endif
 
 
+#ifdef CONFIG_PPC64
 typedef unsigned long pmd_t;
 #define pmd_val(x)     (x)
 #define __pmd(x)       (x)
@@ -160,7 +170,8 @@ typedef unsigned long pmd_t;
 typedef unsigned long pud_t;
 #define pud_val(x)     (x)
 #define __pud(x)       (x)
-#endif
+#endif /* !CONFIG_PPC_64K_PAGES */
+#endif /* CONFIG_PPC64 */
 
 typedef unsigned long pgd_t;
 #define pgd_val(x)     (x)
@@ -178,6 +189,10 @@ extern void copy_user_page(void *to, void *from, unsigned long vaddr,
                struct page *p);
 extern int page_is_ram(unsigned long pfn);
 
+struct vm_area_struct;
+extern const char *arch_vma_name(struct vm_area_struct *vma);
+
+#include <asm-generic/memory_model.h>
 #endif /* __ASSEMBLY__ */
 
 #endif /* __KERNEL__ */