MM: virtual address debug

[safe/jmp/linux-2.6] / arch / x86 / mm / ioremap.c

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 2b2bb3f..a78ffef 100644 (file)
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -23,18 +23,26 @@
 
 #ifdef CONFIG_X86_64
 
-unsigned long __phys_addr(unsigned long x)
+static inline int phys_addr_valid(unsigned long addr)
 {
-       if (x >= __START_KERNEL_map)
-               return x - __START_KERNEL_map + phys_base;
-       return x - PAGE_OFFSET;
+       return addr < (1UL << boot_cpu_data.x86_phys_bits);
 }
-EXPORT_SYMBOL(__phys_addr);
 
-static inline int phys_addr_valid(unsigned long addr)
+unsigned long __phys_addr(unsigned long x)
 {
-       return addr < (1UL << boot_cpu_data.x86_phys_bits);
+       if (x >= __START_KERNEL_map) {
+               x -= __START_KERNEL_map;
+               VIRTUAL_BUG_ON(x >= KERNEL_IMAGE_SIZE);
+               x += phys_base;
+       } else {
+               VIRTUAL_BUG_ON(x < PAGE_OFFSET);
+               x -= PAGE_OFFSET;
+               VIRTUAL_BUG_ON(system_state == SYSTEM_BOOTING ? x > MAXMEM :
+                                       !phys_addr_valid(x));
+       }
+       return x;
 }
+EXPORT_SYMBOL(__phys_addr);
 
 #else
 
@@ -43,6 +51,15 @@ static inline int phys_addr_valid(unsigned long addr)
        return 1;
 }
 
+unsigned long __phys_addr(unsigned long x)
+{
+       /* VMALLOC_* aren't constants; not available at the boot time */
+       VIRTUAL_BUG_ON(x < PAGE_OFFSET || (system_state != SYSTEM_BOOTING &&
+                                       is_vmalloc_addr((void *)x)));
+       return x - PAGE_OFFSET;
+}
+EXPORT_SYMBOL(__phys_addr);
+
 #endif
 
 int page_is_ram(unsigned long pagenr)