- Allow disabling use as a pstore backend
- Add module parameter to disable use as a pstore backend
* [x86] Set EFI_VARS_PSTORE_DEFAULT_DISABLE=y
- explicitly calculate length of VariableName
- Handle duplicate names from get_next_variable()
Also apply another fix entangled with them:
- efi_pstore: Introducing workqueue updating sysfs
svn path=/dists/sid/linux/; revision=19937
Ben Hutchings