Hibernation: Arbitrary boot kernel support - generic code

[linux-2.6-omap-h63xx.git] / kernel / power / snapshot.c

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index a686590d88c1b5def265e84aa9ab9091c4b07290..ccc95ac07bedbc8cbfed19b06a3eca9848b11723 100644 (file)
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1239,17 +1239,39 @@ asmlinkage int swsusp_save(void)
        return 0;
 }
 
-static void init_header(struct swsusp_info *info)
+#ifndef CONFIG_ARCH_HIBERNATION_HEADER
+static int init_header_complete(struct swsusp_info *info)
 {
-       memset(info, 0, sizeof(struct swsusp_info));
+       memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname));
        info->version_code = LINUX_VERSION_CODE;
+       return 0;
+}
+
+static char *check_image_kernel(struct swsusp_info *info)
+{
+       if (info->version_code != LINUX_VERSION_CODE)
+               return "kernel version";
+       if (strcmp(info->uts.sysname,init_utsname()->sysname))
+               return "system type";
+       if (strcmp(info->uts.release,init_utsname()->release))
+               return "kernel release";
+       if (strcmp(info->uts.version,init_utsname()->version))
+               return "version";
+       if (strcmp(info->uts.machine,init_utsname()->machine))
+               return "machine";
+       return NULL;
+}
+#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
+
+static int init_header(struct swsusp_info *info)
+{
+       memset(info, 0, sizeof(struct swsusp_info));
        info->num_physpages = num_physpages;
-       memcpy(&info->uts, init_utsname(), sizeof(struct new_utsname));
-       info->cpus = num_online_cpus();
        info->image_pages = nr_copy_pages;
        info->pages = nr_copy_pages + nr_meta_pages + 1;
        info->size = info->pages;
        info->size <<= PAGE_SHIFT;
+       return init_header_complete(info);
 }
 
 /**
@@ -1303,7 +1325,11 @@ int snapshot_read_next(struct snapshot_handle *handle, size_t count)
                        return -ENOMEM;
        }
        if (!handle->offset) {
-               init_header((struct swsusp_info *)buffer);
+               int error;
+
+               error = init_header((struct swsusp_info *)buffer);
+               if (error)
+                       return error;
                handle->buffer = buffer;
                memory_bm_position_reset(&orig_bm);
                memory_bm_position_reset(&copy_bm);
@@ -1394,22 +1420,13 @@ duplicate_memory_bitmap(struct memory_bitmap *dst, struct memory_bitmap *src)
        }
 }
 
-static inline int check_header(struct swsusp_info *info)
+static int check_header(struct swsusp_info *info)
 {
-       char *reason = NULL;
+       char *reason;
 
-       if (info->version_code != LINUX_VERSION_CODE)
-               reason = "kernel version";
-       if (info->num_physpages != num_physpages)
+       reason = check_image_kernel(info);
+       if (!reason && info->num_physpages != num_physpages)
                reason = "memory size";
-       if (strcmp(info->uts.sysname,init_utsname()->sysname))
-               reason = "system type";
-       if (strcmp(info->uts.release,init_utsname()->release))
-               reason = "kernel release";
-       if (strcmp(info->uts.version,init_utsname()->version))
-               reason = "version";
-       if (strcmp(info->uts.machine,init_utsname()->machine))
-               reason = "machine";
        if (reason) {
                printk(KERN_ERR "swsusp: Resume mismatch: %s\n", reason);
                return -EPERM;