x86: move e820_mark_nosave_regions to e820.c

and make e820_mark_nosave_regions to take limit_pfn to use max_low_pfn
for 32bit and end_pfn for 64bit

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

5 files changed, 34 insertions, 66 deletions

diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 35da8cdbe5e6..0cd9132c9450 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -18,6 +18,7 @@
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/pfn.h>
+#include <linux/suspend.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>
@@ -495,6 +496,37 @@ __init void e820_setup_gap(void)
                pci_mem_start, gapstart, gapsize);
 }
 
+#if defined(CONFIG_X86_64) || \
+        (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
+/**
+ * Find the ranges of physical addresses that do not correspond to
+ * e820 RAM areas and mark the corresponding pages as nosave for
+ * hibernation (32 bit) or software suspend and suspend to RAM (64 bit).
+ *
+ * This function requires the e820 map to be sorted and without any
+ * overlapping entries and assumes the first e820 area to be RAM.
+ */
+void __init e820_mark_nosave_regions(unsigned long limit_pfn)
+{
+        int i;
+        unsigned long pfn;
+
+        pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
+        for (i = 1; i < e820.nr_map; i++) {
+                struct e820entry *ei = &e820.map[i];
+
+                if (pfn < PFN_UP(ei->addr))
+                        register_nosave_region(pfn, PFN_UP(ei->addr));
+
+                pfn = PFN_DOWN(ei->addr + ei->size);
+                if (ei->type != E820_RAM)
+                        register_nosave_region(PFN_UP(ei->addr), pfn);
+
+                if (pfn >= limit_pfn)
+                        break;
+        }
+}
+#endif
 
 /*
  * Early reserved memory areas.
diff --git a/arch/x86/kernel/e820_32.c b/arch/x86/kernel/e820_32.c
index dfe25751038b..db760d4706af 100644
--- a/arch/x86/kernel/e820_32.c
+++ b/arch/x86/kernel/e820_32.c
@@ -9,7 +9,6 @@
 #include <linux/mm.h>
 #include <linux/pfn.h>
 #include <linux/uaccess.h>
-#include <linux/suspend.h>
 
 #include <asm/pgtable.h>
 #include <asm/page.h>
@@ -208,37 +207,6 @@ void __init init_iomem_resources(struct resource *code_resource,
         }
 }
 
-#if defined(CONFIG_PM) && defined(CONFIG_HIBERNATION)
-/**
- * e820_mark_nosave_regions - Find the ranges of physical addresses that do not
- * correspond to e820 RAM areas and mark the corresponding pages as nosave for
- * hibernation.
- *
- * This function requires the e820 map to be sorted and without any
- * overlapping entries and assumes the first e820 area to be RAM.
- */
-void __init e820_mark_nosave_regions(void)
-{
-        int i;
-        unsigned long pfn;
-
-        pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
-        for (i = 1; i < e820.nr_map; i++) {
-                struct e820entry *ei = &e820.map[i];
-
-                if (pfn < PFN_UP(ei->addr))
-                        register_nosave_region(pfn, PFN_UP(ei->addr));
-
-                pfn = PFN_DOWN(ei->addr + ei->size);
-                if (ei->type != E820_RAM)
-                        register_nosave_region(PFN_UP(ei->addr), pfn);
-
-                if (pfn >= max_low_pfn)
-                        break;
-        }
-}
-#endif
-
 /*
  * Find the highest page frame number we have available
  */
diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 3b2e0b1bb49b..5e063e72b24a 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -17,7 +17,6 @@
 #include <linux/kexec.h>
 #include <linux/module.h>
 #include <linux/mm.h>
-#include <linux/suspend.h>
 #include <linux/pfn.h>
 #include <linux/pci.h>
 
@@ -94,37 +93,6 @@ void __init e820_reserve_resources(void)
 }
 
 /*
- * Find the ranges of physical addresses that do not correspond to
- * e820 RAM areas and mark the corresponding pages as nosave for software
- * suspend and suspend to RAM.
- *
- * This function requires the e820 map to be sorted and without any
- * overlapping entries and assumes the first e820 area to be RAM.
- */
-void __init e820_mark_nosave_regions(void)
-{
-        int i;
-        unsigned long paddr;
-
-        paddr = round_down(e820.map[0].addr + e820.map[0].size, PAGE_SIZE);
-        for (i = 1; i < e820.nr_map; i++) {
-                struct e820entry *ei = &e820.map[i];
-
-                if (paddr < ei->addr)
-                        register_nosave_region(PFN_DOWN(paddr),
-                                                PFN_UP(ei->addr));
-
-                paddr = round_down(ei->addr + ei->size, PAGE_SIZE);
-                if (ei->type != E820_RAM)
-                        register_nosave_region(PFN_UP(ei->addr),
-                                                PFN_DOWN(paddr));
-
-                if (paddr >= (end_pfn << PAGE_SHIFT))
-                        break;
-        }
-}
-
-/*
  * Finds an active region in the address range from start_pfn to last_pfn and
  * returns its range in ei_startpfn and ei_endpfn for the e820 entry.
  */
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 3c451d143eba..e1173aecf69a 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -820,7 +820,7 @@ void __init setup_arch(char **cmdline_p)
 #endif
 
         e820_setup_gap();
-        e820_mark_nosave_regions();
+        e820_mark_nosave_regions(max_low_pfn);
 
 #ifdef CONFIG_VT
 #if defined(CONFIG_VGA_CONSOLE)
diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index 6dff1286ad8a..975a5da46e49 100644
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -516,7 +516,7 @@ void __init setup_arch(char **cmdline_p)
          * We trust e820 completely. No explicit ROM probing in memory.
          */
         e820_reserve_resources();
-        e820_mark_nosave_regions();
+        e820_mark_nosave_regions(end_pfn);
 
         /* request I/O space for devices used on all i[345]86 PCs */
         for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)