Re: [PATCH] print_dev_t for 2.6.0-test1-mm

From: Andrew Morton (
Date: Wed Jul 16 2003 - 17:21:43 EST

Andries Brouwer <> wrote:
> > Why do we need the 16:16 option?
> It is not very important, but major 0 is reserved, so if userspace
> (or a filesystem) hands us a 32-bit device number, we have to
> split that in some way, not 0+32. Life is easiest with 16+16.
> (Now the major is nonzero, otherwise we had 8+8.)
> Other choices lead to slightly more complicated code.

Why would anyone hand the kernel a 32-bit device number? They're either 16
or 64, are they not?

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