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    SubjectRe: [1/6] 2.6.21-rc2: known regressions
    On Mon, 5 Mar 2007 02:50:31 +0100 Adrian Bunk <> wrote:

    > This email lists some known regressions in 2.6.21-rc2 compared to 2.6.20
    > that are not yet fixed in Linus' tree.

    We seem to have broken an unusually large amount of stuff this time.

    partial post-mortem:

    - The ACPICA merge landed in -mm super-late: basically it was in mainline
    a week afterwards and saw only a single -mm release.

    Part of the reason for this short period in -mm was that ACPICA had its
    paws all over x86_64 code and conflicted badly with significant changes
    in the x86_64 tree.

    That happens sometimes. But when it does, the mess lands in my lap
    rather than in the laps of the perpetrators.

    Lesson: keep the code well-factored so that different subsystems don't
    soil each others' kennels.

    - The hrtimers/dynticks stuff is simply hard: timekeeping, low-level x86,
    even APICs. These are areas in which things break a lot, so churning it
    was inevitably going to cause problems.

    Lesson: none, I think. Low-level x86 support is just hard, and
    changing it breaks things.

    So that accounts for _some_ of the damage, but I wonder if there's more to
    it than that.

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