From 77bb36e57bbe5586bea29b67ba7f87cfe03610a0 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Wed, 18 Mar 2015 13:22:00 +0100 Subject: [PATCH] s390/cacheinfo: add missing facility check Git commit d97d929f06d0 ("s390: move cacheinfo sysfs to generic cacheinfo infrastructure") removed the general-instructions-extension availability check before the ecag instruction is executed. Without this check this may lead to crashes on machines without this facility. Therefore add the check again where needed. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kernel/cache.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/s390/kernel/cache.c b/arch/s390/kernel/cache.c index 0969d113b3d6..bff5e3b6d822 100644 --- a/arch/s390/kernel/cache.c +++ b/arch/s390/kernel/cache.c @@ -70,6 +70,8 @@ void show_cacheinfo(struct seq_file *m) struct cacheinfo *cache; int idx; + if (!test_facility(34)) + return; get_online_cpus(); this_cpu_ci = get_cpu_cacheinfo(cpumask_any(cpu_online_mask)); for (idx = 0; idx < this_cpu_ci->num_leaves; idx++) { @@ -159,6 +161,8 @@ int populate_cache_leaves(unsigned int cpu) union cache_topology ct; enum cache_type ctype; + if (!test_facility(34)) + return -EOPNOTSUPP; ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0); for (idx = 0, level = 0; level < this_cpu_ci->num_levels && idx < this_cpu_ci->num_leaves; idx++, level++) { -- 2.20.1