[POWERPC] spufs: Add a "capabilities" file to spu contexts
This adds a "capabilities" file to spu contexts consisting of a list of linefeed separated capability names. The current exposed capabilities are "sched" (the context is scheduleable) and "step" (the context supports single stepping). Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Acked-by: NJeremy Kerr <jk@ozlabs.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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