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To: Bruce Evans <bde@zeta.org.au>
cc: julian@freefall.freebsd.org, committers@freebsd.org, hackers@freebsd.org
Subject: Re: cvs commit: src/sys/kern kern_conf.c uipc_socket2.c 
In-reply-to: Your message of "Tue, 20 Aug 1996 11:02:21 +1000."
             <199608200102.LAA01327@godzilla.zeta.org.au> 
Date: Mon, 19 Aug 1996 20:51:54 -0700
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  From: Bruce Evans <bde@zeta.org.au>
  Subject: Re: cvs commit:  src/sys/kern kern_conf.c uipc_socket2.c
  >It would be a good thing(tm) if the #define CDEV_MAJOR and
  >#define BDEV_MAJOR definitions were completely removed from all .c files.
  
  They should go away (when device numbers in inodes go away), so don't
  spend much time fixing them.
  
  >Instead, configure should read in the files config/majors and
  >i386/config/majors.i386 and produce a bunch of "major_xxx.h" files,
  >each with a #define XXX_CDEV_MAJOR <n> values.
  
  There should be at most one majors.h file.  Drivers don't need to know
  their own numbers, but kern_conf.c needs to know until the numbers go

Yes they do!  That's the rub.  Lots of things in drivers call makedev(). :-(

  away.  This can be implemented using table lookup.  E.g.,
  cdevsw_add_devsw(dev_t *dev, int bdev, struct cdevsw *dp) could have
  been simply cdevsw_add_devsw(struct cdevsw *dp).  dp->d_name gives the
  name of the device, which can be looked up in a table in majors.h.  It's
  probably not worth implementing this now, since the whole interface will
  have to change (all device info should be in one struct managed by devfs
  and this struct will be passed around instead of dev_t's or devswitch
  pointers.
  
  >Why am I suggesting this?  Majors.XXX is not being kept up to date for thing
>>s
  >that require fixed major numbers.  I know, DEVFS and fully dynmic major
  >numbers fixes this.  I'm not holding my breath.
  
  Neither is devices.i386 (it's missing at least ccd) :-(.
  
  Bruce