Da Zheng, le Fri 23 Apr 2010 14:51:22 +0800, a écrit : > They are not just one or two variables. They are an array of structure > variables. Should I define all fields of the structure with volatile > qualifier?
You can qualify the whole structure > It's strange. The Linux driver doesn't do so but it definitely works in the > Linux kernel. It does (or should do): such pointers have the __io qualifier. > I use the mem device to allocate MMIO space. I guess INTEL_PTE_NCACHE and > INTEL_PTE_WTHRU haven't been set to the MMIO pages, right? Depends on how you use the mem device. It it ends up using pmap_enter() to actually fill the page table, it will notice whether your physical addresses are within RAM or above, see the code there. Samuel
