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    SubjectRe: mtd: kernel BUG at arch/x86/mm/pat.c:279!
    On Sat, 2012-09-08 at 12:57 -0700, Linus Torvalds wrote:
    > Whatever. Something like this (TOTALLY UNTESTED) attached patch should
    > get the mtdchar overflows to go away,

    It looks good to me. Acked-by: Suresh Siddha <>

    Sasha, can you please give this a try?

    > but it does *not* fix the fact
    > that the MTRR start/end model is broken. It really is technically
    > valid to have a resource_size_t range of 0xfffffffffffff000+0x1000,
    > and right now it causes a BUG_ON() in pat.c.
    > Suresh?

    yes but that is not a valid range I think because of the supported
    physical address bit limits of the processor and also the max
    architecture limit of 52 address bits.

    I guess we should be checking for those limits in pat.c, especially bits
    above 52 are ignored by the HW and they can easily cause conflicting
    aliases with other valid regions. I will get back with a different patch
    to fix this.


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      Last update: 2012-09-09 17:42    [W:3.017 / U:29.460 seconds]
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