Hibernation: Arbitrary boot kernel support - generic code

Add the bits needed for supporting arbitrary boot kernels to the common
hibernation code.

To support arbitrary boot kernels, make it possible to replace the 'struct
new_utsname' and the kernel version in the hibernation image header by some
architecture specific data that will be used to verify if the image is valid
and to restore the image.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/power/power.h b/kernel/power/power.h
index 95fbf2dd3fe33901be99ef8ce60a3bf2ca9fb833..a0204dfc6c4cf054f4d11074c5266e9ebf35bc31 100644 (file)
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -11,14 +11,32 @@ struct swsusp_info {
        unsigned long           size;
 } __attribute__((aligned(PAGE_SIZE)));
 
+#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_ARCH_HIBERNATION_HEADER
+/* Maximum size of architecture specific data in a hibernation header */
+#define MAX_ARCH_HEADER_SIZE   (sizeof(struct new_utsname) + 4)
 
+extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
+extern int arch_hibernation_header_restore(void *addr);
+
+static inline int init_header_complete(struct swsusp_info *info)
+{
+       return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
+}
+
+static inline char *check_image_kernel(struct swsusp_info *info)
+{
+       return arch_hibernation_header_restore(info) ?
+                       "architecture specific data" : NULL;
+}
+#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
 
-#ifdef CONFIG_HIBERNATION
 /*
  * Keep some memory free so that I/O operations can succeed without paging
  * [Might this be more than 4 MB?]
  */
 #define PAGES_FOR_IO   ((4096 * 1024) >> PAGE_SHIFT)
+
 /*
  * Keep 1 MB of memory free so that device drivers can allocate some pages in
  * their .suspend() routines without breaking the suspend to disk.

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;