| Date | Sun, 4 Mar 2007 18:26:19 -0800 | From | Andrew Morton <> | Subject | Re: [1/6] 2.6.21-rc2: known regressions |
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On Mon, 5 Mar 2007 02:50:31 +0100 Adrian Bunk <bunk@stusta.de> 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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