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This makes the ICS support less than the 8 architected bits and sets the soc to use 3 bits by default. All the supported bits set translates to "masked" (and will read back at 0xff), any small value is used as-is. Linux doesn't use priorities above 5, so this is a way to save silicon. The number of supported priority bits is exposed to the OS via the config register. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>