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powerpc: Warn about use of smt_snooze_delay
commit a02f6d4 upstream. It's not done anything for a long time. Save the percpu variable, and emit a warning to remind users to not expect it to do anything. This uses pr_warn_once instead of pr_warn_ratelimit as testing 'ppc64_cpu --smt=off' on a 24 core / 4 SMT system showed the warning to be noisy, as the online/offline loop is slow. Fixes: 3fa8cad ("powerpc/pseries/cpuidle: smt-snooze-delay cleanup.") Cc: [email protected] # v3.14 Signed-off-by: Joel Stanley <[email protected]> Acked-by: Gautham R. Shenoy <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>
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