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freebsd_amp_hwpstate
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This file lies by saying 200-255 are reserved for local use, thus 

implying that they aren't used for the rest of the system.

Fix the lies:
	253 is used by mfs (bad MFS for not registering it).
	254 is a magic cookie inside of the dev code in at least one place.
	255 is -1 which is magic in a different way in the dev code.
So, that means that 200-252 are reserved for local users.  A grep for
252 didn't turn anything up, so I'm assuming it and lower are safe.

And I thought I was being smart by allocating our local major numbers
from 254 on down.  This caused very very odd problems that were hard
to track down: close not being called, sync failing at reboot, etc.
This commit is contained in:
Warner Losh 2000-06-14 23:34:22 +00:00
parent 6ea6805f8c
commit 03c16f958a
1 changed files with 5 additions and 2 deletions
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7
sys/conf/majors
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@ -165,5 +165,8 @@ chrdev name comments
146 twe 3ware Escalade ATA RAID (controller)
147 twed 3ware Escalade ATA RAID (drives)
148 agp AGP <dfr>
200 ?? entries from 200-255 are reserved for local use
255 ?? entries from 200-255 are reserved for local use
200 ?? entries from 200-252 are reserved for local use
252 ?? entries from 200-252 are reserved for local use
253 mfs Used by MFS
254 internal Used internally by the kernel
255 bad choice -1 is 255 which has magic meanings internally