Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6

* 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (50 commits)
  printk: do not mangle valid userspace syslog prefixes
  efivars: Add Documentation
  efivars: Expose efivars functionality to external drivers.
  efivars: Parameterize operations.
  efivars: Split out variable registration
  efivars: parameterize efivars
  efivars: Make efivars bin_attributes dynamic
  efivars: move efivars globals into struct efivars
  drivers:misc: ti-st: fix debugging code
  kref: Fix typo in kref documentation
  UIO: add PRUSS UIO driver support
  Fix spelling mistakes in Documentation/zh_CN/SubmittingPatches
  firmware: Fix unaligned memory accesses in dmi-sysfs
  firmware: Add documentation for /sys/firmware/dmi
  firmware: Expose DMI type 15 System Event Log
  firmware: Break out system_event_log in dmi-sysfs
  firmware: Basic dmi-sysfs support
  firmware: Add DMI entry types to the headers
  Driver core: convert platform_{get,set}_drvdata to static inline functions
  Translate linux-2.6/Documentation/magic-number.txt into Chinese
  ...

1 files changed, 37 insertions, 0 deletions

diff --git a/include/linux/efi.h b/include/linux/efi.h
index fb737bc19a8c..33fa1203024e 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -397,4 +397,41 @@ static inline void memrange_efi_to_native(u64 *addr, u64 *npages)
         *addr &= PAGE_MASK;
 }
 
+#if defined(CONFIG_EFI_VARS) || defined(CONFIG_EFI_VARS_MODULE)
+/*
+ * EFI Variable support.
+ *
+ * Different firmware drivers can expose their EFI-like variables using
+ * the following.
+ */
+
+struct efivar_operations {
+        efi_get_variable_t *get_variable;
+        efi_get_next_variable_t *get_next_variable;
+        efi_set_variable_t *set_variable;
+};
+
+struct efivars {
+        /*
+         * ->lock protects two things:
+         * 1) ->list - adds, removals, reads, writes
+         * 2) ops.[gs]et_variable() calls.
+         * It must not be held when creating sysfs entries or calling kmalloc.
+         * ops.get_next_variable() is only called from register_efivars(),
+         * which is protected by the BKL, so that path is safe.
+         */
+        spinlock_t lock;
+        struct list_head list;
+        struct kset *kset;
+        struct bin_attribute *new_var, *del_var;
+        const struct efivar_operations *ops;
+};
+
+int register_efivars(struct efivars *efivars,
+                     const struct efivar_operations *ops,
+                     struct kobject *parent_kobj);
+void unregister_efivars(struct efivars *efivars);
+
+#endif /* CONFIG_EFI_VARS */
+
 #endif /* _LINUX_EFI_H */