redonkable
/
remarkable-linux
1
0
Fork 0
Code Releases Activity

powerpc: Don't preempt_disable() in show_cpuinfo() 

commit 349524bc0d 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: cd77b5ce20 ("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>
pull/10/head
Benjamin Herrenschmidt 2018-01-10 17:10:12 +11:00 committed by Greg Kroah-Hartman
parent 27ea98a4c5
commit 92ce74164e
1 changed files with 0 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/powerpc/kernel/setup-common.c
View File

@ -242,14 +242,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
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
@ -358,9 +350,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
#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);