Alan Cox wrote:

> > For example please grep for the MINOR() macro in the scsi layer...
> > Most of the places where it's used should be replaced by a simple
> > driver instance enumerator. I did this once already, so this is for
> > sure.
> 
> it become block_device->instance or ->minor

Well if all the infromation those functions are needing would
be already in block_device in place, that it could become as easy
as just passing &block_device there.
However please note that replacing kdev_t in the scsi layer
with just passing the minor can be done already *now* without
any pain. The same applies to the excessive MINOR lookups in the
v4l code. I did this already some time ago  (patch was here - about one
year ago)

> major/minors for old stuff still end up leaking into user space and
> mattering there. I'm not sure the best option for that

Thta's no problem. But they should be used as hash values no the
syscall implementation level and nowhere else.

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