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    SubjectRe: next-20120313 cpuidle freezes when booting
    On Wed, 14 Mar 2012, Daniel Lezcano wrote:
    > On 03/13/2012 11:29 PM, Hugh Dickins wrote:
    > > Hi Stephen,
    > >
    > > Yesterday's 3.3.0-rc7-next-20120313 gives me unpredictable freezes
    > > on x86_64, on a ThinkPad T420s - I've not dared it on more machines.
    > >
    > > Usually when booting up (sometimes just after Freeing unused kernel
    > > memory, sometimes random places elsewhere), but occasionally it manages
    > > to get as far as X; doesn't usually manage to complete suspend+resume.
    > >
    > > 3.3.0-rc6-nex-20120309 behaved similarly; the last I tried before
    > > that was 3.3.0-rc5-next20120227, which was okay.
    > >
    > > Bisection led me to "cpuidle: Add common time keeping and irq enabling",
    > > (from the cpuidle-cons tree I think), and reverting that has so far
    > > given me a working system (it's a success if I complete this mail).
    > >
    > > Below is the patch I've used to revert it (for other people having
    > > problems with recent linux-next to try); but it's not quite correct,
    > > because you did a merge on conflicting trees there, and I didn't spend
    > > time to unravel all that, just get a working x86 system - since I've
    > > left out some of your merge (in arch/arm/kernel/Makefile and arch/arm/
    > > mach-at91/cpuidle.c), this reversion probably breaks arm as is.
    > Hi Hugh,
    > is it possible you give the cpuidle driver your host is using ?

    "grep IDLE .config" tells me:

    # CONFIG_I7300_IDLE is not set

    but I've a feeling that isn't what you need to know.

    Is there some /proc or /sys file I can read to tell you?

    Though if it's something that changes dynamically, then what
    I read now might not be what it would say when things go wrong.

    I expect you've realized by now, I haven't a clue about cpuidle
    drivers: I hadn't even realized that idleness needs a driver.


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