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    SubjectRe: Bisected regression (Was Re: current -git fails to boot on nehalem-ex)
    On Thu, Dec 10 2009, Jens Axboe wrote:
    > > >> [ 0.000000] Kernel panic - not syncing: Overlapping early reservations 12-f011 MP-table mpc to 0-fff BIOS data page
    > > >
    > > > mptable mpc is [12 - f011]
    > > >
    > > > what a BIOS !
    > > >
    > > > can you check if it works with 2.6.32 + "acpi=off"?
    >
    > I'll try that.

    Yes, 2.6.32 boots fine with acpi=off passed.

    > > please check if this one could workaround it.
    > >
    > > diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
    > > index d17d482..f60acec 100644
    > > --- a/arch/x86/kernel/e820.c
    > > +++ b/arch/x86/kernel/e820.c
    > > @@ -732,7 +732,7 @@ struct early_res {
    > > char overlap_ok;
    > > };
    > > static struct early_res early_res[MAX_EARLY_RES] __initdata = {
    > > - { 0, PAGE_SIZE, "BIOS data page" }, /* BIOS data page */
    > > + { 0, PAGE_SIZE, "BIOS data page", 1 }, /* BIOS data page */
    > > {}
    > > };
    >
    > And then this. Results in 10-15min.

    Doesn't work, it just complains about a different overlap:

    [ 0.000000] Kernel panic - not syncing: Overlapping early
    reservations 12-f011 MP-table mpc to 6000-7fff TRAMPOLINE
    [ 0.000000]
    [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.32 #51
    [ 0.000000] Call Trace:
    [ 0.000000] [<ffffffff813c709b>] panic+0xa0/0x16a
    [ 0.000000] [<ffffffff8167d280>] ?
    reserve_early_overlap_ok+0x2e/0x39
    [ 0.000000] [<ffffffff8167d24a>] ?
    drop_overlaps_that_are_ok+0x117/0x11f
    [ 0.000000] [<ffffffff8167d133>] drop_overlaps_that_are_ok+0x0/0x11f
    [ 0.000000] [<ffffffff8167d2c6>] reserve_early+0x3b/0x3d
    [ 0.000000] [<ffffffff81683248>] smp_scan_config+0xe7/0x10e
    [ 0.000000] [<ffffffff816832a9>] default_find_smp_config+0x3a/0x60
    [ 0.000000] [<ffffffff8167b0be>] setup_arch+0x6ae/0xa88
    [ 0.000000] [<ffffffff816789ff>] start_kernel+0x82/0x412
    [ 0.000000] [<ffffffff81678289>] x86_64_start_reservations+0x99/0xb9
    [ 0.000000] [<ffffffff81678389>] x86_64_start_kernel+0xe0/0xf2


    --
    Jens Axboe



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