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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-03-18 13:22:00 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-04-13 10:46:16 +0200 |
| commit | 77bb36e57bbe5586bea29b67ba7f87cfe03610a0 (patch) | |
| tree | 585024117ef4acc9a5f5a5c6de5032620e7c39d5 /arch/s390 | |
| parent | 1a327ffd3d6a79ed85d53b683c185196060ac3b3 (diff) | |
| download | lwn-77bb36e57bbe5586bea29b67ba7f87cfe03610a0.tar.gz lwn-77bb36e57bbe5586bea29b67ba7f87cfe03610a0.zip | |
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.c | 4 |
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++) { |