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powerpc/xmon: Use cpumask iterator to avoid warning

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commit bc1d770291 upstream.

We have a bug report where the kernel hits a warning in the cpumask
code:

WARNING: at include/linux/cpumask.h:107

Which is:
        WARN_ON_ONCE(cpu >= nr_cpumask_bits);

The backtrace is:
        cpu_cmd
        cmds
        xmon_core
        xmon
        die

xmon is iterating through 0 to NR_CPUS. I'm not sure why we are still
open coding this but iterating above nr_cpu_ids is definitely a bug.

This patch iterates through all possible cpus, in case we issue a
system reset and CPUs in an offline state call in.

Perhaps the old code was trying to handle CPUs that were in the
partition but were never started (eg kexec into a kernel with an
nr_cpus= boot option). They are going to die way before we get into
xmon since we haven't set any kernel state up for them.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Blanchard 2012-06-28 19:28:57 +00:00 committed by Greg Kroah-Hartman
parent d3ea90f6d1
commit 24ec2125f3
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/xmon/xmon.c
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@ -975,7 +975,7 @@ static int cpu_cmd(void)
/* print cpus waiting or in xmon */
printf("cpus stopped:");
count = 0;
for (cpu = 0; cpu < NR_CPUS; ++cpu) {
for_each_possible_cpu(cpu) {
if (cpumask_test_cpu(cpu, &cpus_in_xmon)) {
if (count == 0)
printf(" %x", cpu);