Messages in this thread | | | Date | Mon, 14 Apr 2003 11:00:27 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [PATCH] kdevt-diff |
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On Mon, 14 Apr 2003, Joel Becker wrote: > > On Mon, Apr 14, 2003 at 12:45:36AM +0200, Andries.Brouwer@cwi.nl wrote: > > The structure here is 8+8, except when more bits are > > present, in which case it is 16+16, except when more bits > > are present, in which case it is 32+32. > > Why complicate things? Is it that bad? We'd all have to know > about the mess when dealing with userspace.
Well, the thing is, we absolutely _do_ need to have the 8+8 split, in order to make old devices look the same old way for old binaries.
And the 32+32 split is what the new maximum would be, so ..
The 16+16 split is not strictly necessary, but Andries pointed out to me that there are filesystems etc external storage that only support a 32-bit opaque dev_t, so we'd need to marshall the device number _some_ way for them anyway, and having a standard way to do that is better than having everybody come up with their own variations.
(My prefernce for the 32-bit version would be 12+20 bits, but it's not a very strong one, and it doesn't really matter for the kernel proper, so I think Andries who has been tirelessly working on this for five years or more gets the final say on it).
Linus
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