Re: [RFC Patch] use MTRR for write combining if PAT is notavailable

[Konrad Rzeszutek Wilk]

> X.org uses libpciaccess which tries to mmap with write combining enabled via
> /sys/bus/pci/devices/*/resource0_wc. Currently, when PAT is not enabled, we
> fall back to uncached mmap. Then libpciaccess thinks it succeeded mapping
> with write combining anabled and does not set up suited MTRR entries. ;-(

I am not familiar with libpciaccess, but I was wondering why that library
cannot realize it failed in its endeavour and use other means to accomplish
its goals?

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