powerpc: Make sysfs code use smp_call_function_single
Impact: performance improvement This fixes 'powerpc: avoid cpumask games in arch/powerpc/kernel/sysfs.c' which talked about using smp_call_function_single, but actually used work_on_cpu (an older version of the patch). Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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