On Sunday 27 May 2007 08:55:45 pm Peter Chubb wrote: > >>>>> "Peter" == Peter Chubb <peter@xxxxxxxxxxxxxxxxxx> writes: > > >>>>> "Bjorn" == Bjorn Helgaas <bjorn.helgaas@xxxxxx> writes: > > Bjorn> Example memory map (from HP sx1000 with VGA enabled): 0x00000 - > Bjorn> 0x9FFFF supports only WB (cacheable) access 0xA0000 - 0xBFFFF > Bjorn> supports only UC (uncacheable) access 0xC0000 - 0xFFFFF > Bjorn> supports only WB (cacheable) access > > Bjorn> Some versions of X map the entire 0x00000-0xFFFFF area at once. > Bjorn> With the example above, this mmap must fail because there's no > Bjorn> memory attribute that's safe for the entire area. > > Peter> This patch breaks X on a ZX2000. > > Except that there is a fix in the latest X source. > > Sorry to bother you all. No problem, I should have mentioned the X server interlock in the changelog, which would have saved you the trouble of debugging this. This whole area has been an incredible headache, and I recently discovered yet another hole to be fixed (mmap via /proc/bus/pci needs to be checked, iirc). Bjorn - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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