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authorAnton Blanchard <anton@samba.org>2012-06-28 19:28:57 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-07-02 14:30:11 +1000
commitbc1d7702910c7c7e88eb60b58429dbfe293683ce (patch)
treef71a89900b723af1208bd73e3c330d806fe6a504 /arch
parentbc6dc752f35488160ffac07ae91bed1bddaea32a (diff)
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powerpc/xmon: Use cpumask iterator to avoid warning
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> CC: <stable@kernel.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/xmon/xmon.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 0f3ab06d222..eab3492a45c 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -971,7 +971,7 @@ 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);