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    SubjectRe: Linux 2.6.15-rc4


    On Thu, 1 Dec 2005, Kasper Sandberg wrote:
    >
    > On Wed, 2005-11-30 at 22:40 -0800, Linus Torvalds wrote:
    > <snip>
    > >
    > > Linus
    > >
    > > [ Btw, some drivers will now complain loudly about their nasty mis-use of
    > > page remapping, and that migh look scary, but it should all be good, and
    > > we'd love to see the detailed output of dmesg on such machines. ]
    > >
    >
    > this is the ati proprietary driver on x86 laptop.
    >
    > Backtrace:
    > [<b013d88d>] bad_page+0x7d/0xc0
    > [<b013e124>] free_hot_cold_page+0x44/0x100
    > [<b0148c2c>] zap_pte_range+0xfc/0x220
    > [<b0148e3c>] unmap_page_range+0xec/0x110
    > [<b0148f21>] unmap_vmas+0xc1/0x1e0
    > [<b014cc45>] unmap_region+0x85/0x110
    > [<b014cf39>] do_munmap+0xd9/0x120
    > [<b014cfc7>] sys_munmap+0x47/0x70
    > [<b0102f1b>] sysenter_past_esp+0x54/0x75
    > Trying to fix it up, but a reboot is needed

    It _should_ have said something before this too. In particular, I'd have
    expected a message like

    X.org does an incomplete pfn remapping
    Backtrace:
    ....

    when the thing started up. Oh, and _just_ before that trace, I'd have
    expected a

    Bad page state at ....
    flags: .....

    which is also something I'd like to see.

    Oh, and that "Trying to fix it up, but a reboot is needed" message should
    be harmless. We share the same "bad_page()" function with all the
    problems, even though the PageReserved() one should really be harmless
    apart from being scary-noisy. So please keep running, if only to verify
    that I'm not full of crap about that.

    (I can silence the nasty warnings easily enough, but I wanted people who
    triggered the new code-paths to be aware of it and report to me what
    drivers to it, so they are _really_ noisy right now).

    Thanks,

    Linus
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