The archive files at kernel.org have sensible timestamps for restoring a backup copy. Though who knows -- maybe somebody editted those timestamps (for directory sorting purposes)... Anyway, manufacturer forks for the ARM series would complicate such comparisons.
It seems that at the 2.6.10 vintage, the lab126 code is bit cleaner (regarding trailing spaces, at least). And the mmc driver lab126 used looks much more "modern" (in interrupt handling and added SD 2.0 support and SDHC support as well, all missing from the mainline "fork" at kernel.org -- with the mmc.c original author (Woodhouse) having different email addresses in those two forks).
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