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Subjectreboot notifier priority definitions
As a suggestion to prevent further shutdown/reboot notifier processing problems
here's a (crude) attempt of definitions for include/linux/notifier.h. I do
believe it needs to be heavily reworked by someone with a broad kernel overview.

#define NOTIFY_REBOOT_PHYSICAL 0x00 /* scsi */
#define NOTIFY_REBOOT_LOGICAL 0x10 /* md, lvm */
#define NOTIFY_REBOOT_FS 0x20 /* knfsd */
#define NOTIFY_REBOOT_APPLICATION 0x30 /* tux */

The current situation of not having such definitions already did lead to a
kernel oops (md<->scsi). I do fear that if such definitions are not introduced:

1. code maintainers will strictly stick to priority 0 or will use random
and not interoperable priorities

2. more and more interference problems will arise due to the above point

Andreas Steinmetz
D.O.M. Datenverarbeitung GmbH
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