[PATCH] 32-bit dev_t: internal use
Starting the conversion: * internal dev_t made 32bit. * new helpers - new_encode_dev(), new_decode_dev(), huge_encode_dev(), huge_decode_dev(), new_valid_dev(). They do encoding/decoding of 32bit and 64bit values; for now huge_... are aliases for new_... and new_valid_dev() is always true. We do 12:20 for 32bit; representation is compatible with 16bit one - we have major in bits 19--8 and minor in 31--20,7--0. That's what the userland sees; internally we have (major << 20)|minor, of course. * MKDEV(), MAJOR() and MINOR() updated. * several places used to handle Missed'em'V dev_t (14:18 split) manually; that stuff had been taken into common helpers. Now we can start replacing old_... with new_... and huge_..., depending on the width available. MKDEV() callers should (for now) make sure that major and minor are within 12:20. That's what the next chunk will do.
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