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Cache info is setup by walking the device tree in initialize_cache_info(). However, icache_flush_range might be called before that, in slb_initialize()->patch_slb_encoding, which modifies the load immediate instructions used with SLB fault code. Not only that, but depending on memory layout, we might take SLB faults during unflatten_device_tree. So that fault will load an SLB entry that might not contain the right LLP flags for the segment. Either we can walk the flattened device tree to setup cache info, or we can pick the known defaults that are known to work. Doing it in the flattened device tree is hairier since we need to know the machine type to know what property to look for, etc, etc. For now, it's just easier to go with the defaults. Worst thing that happens from it is that we might waste a few cycles doing too small dcbst/icbi increments. Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: Paul Mackerras <paulus@samba.org> |
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