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    SubjectRE: Domain faults when CONFIG_CPU_SW_DOMAIN_PAN is enabled
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    Russell King wrote:
    > On Thu, Dec 03, 2015 at 11:38:20AM +0000, Peter Rosin wrote:
    > > Russell King wrote:
    > > > On Thu, Dec 03, 2015 at 08:33:13AM +0000, Peter Rosin wrote:
    > > > > I wrote:
    > > > > > If I enable CONFIG_CPU_SW_DOMAIN_PAN, I sometimes (but not always) get the
    > > > > > following (or very similar) on boot.
    > > > >
    > > > > I should have said "if I don't disable", as the option is "default y".
    > > > >
    > > > > Also, if it survives on boot, below is an example of later trouble (after
    > > > > 30+ minutes on this occasion).
    > > >
    > > > Please apply this patch so we (might) get a slightly better oops dump,
    > > > and then try to reproduce.
    > >
    > > Sure thing, but it's still "DAC: 00000051"...
    >
    > Thanks, that confirms that something in the uaccess-with-memcpy code
    > is clearing the DACR back to 0x51.
    >
    > This has come up several times before, and I really can't spot the
    > problem in this code, so I've always said to disable the
    > uaccess-with-memcpy code. Personally, I'd like to see the back
    > of that code...

    Ok, but it's not me doing crazy things if that's what you are implying
    (not saying that you are), because the sama5_defconfig has

    CONFIG_UACCESS_WITH_MEMCPY=y

    So, something needs to happen or sama5 remains default-broken.

    Cheers,
    Peter



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