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 [off-list ref]

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.

thanks,
suresh


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