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authorHeiko Carstens <heiko.carstens@de.ibm.com>2015-03-18 15:22:00 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-04-13 11:46:16 +0300
commit77bb36e57bbe5586bea29b67ba7f87cfe03610a0 (patch)
tree585024117ef4acc9a5f5a5c6de5032620e7c39d5 /arch/s390
parent1a327ffd3d6a79ed85d53b683c185196060ac3b3 (diff)
downloadlinux-77bb36e57bbe5586bea29b67ba7f87cfe03610a0.tar.xz
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 <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kernel/cache.c4
1 files changed, 4 insertions, 0 deletions
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++) {