4.4-stable review patch. If anyone has any objections, please let me know.
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From: Benjamin Herrenschmidt benh@kernel.crashing.org
commit 349524bc0da698ec77f2057cf4a4948eb6349265 upstream.
This causes warnings from cpufreq mutex code. This is also rather unnecessary and ineffective. If we really want to prevent concurrent unplug, we could take the unplug read lock but I don't see this being critical.
Fixes: cd77b5ce208c ("powerpc/powernv/cpufreq: Fix the frequency read by /proc/cpuinfo") Signed-off-by: Benjamin Herrenschmidt benh@kernel.crashing.org Signed-off-by: Michael Ellerman mpe@ellerman.id.au Acked-by: Michal Suchanek msuchanek@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/kernel/setup-common.c | 11 ----------- 1 file changed, 11 deletions(-)
--- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -217,14 +217,6 @@ static int show_cpuinfo(struct seq_file unsigned short maj; unsigned short min;
- /* We only show online cpus: disable preempt (overzealous, I - * knew) to prevent cpu going down. */ - preempt_disable(); - if (!cpu_online(cpu_id)) { - preempt_enable(); - return 0; - } - #ifdef CONFIG_SMP pvr = per_cpu(cpu_pvr, cpu_id); #else @@ -329,9 +321,6 @@ static int show_cpuinfo(struct seq_file #ifdef CONFIG_SMP seq_printf(m, "\n"); #endif - - preempt_enable(); - /* If this is the last cpu, print the summary */ if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) show_cpuinfo_summary(m);