Messages in this thread | | | Subject | Re: [PATCH v2 1/2] drivers: base: cacheinfo: Do not populate sysfs for unknown cache types | From | Jeremy Linton <> | Date | Fri, 14 Sep 2018 12:14:11 -0500 |
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Hi,
On 09/14/2018 11:28 AM, Jeffrey Hugo wrote: > If a cache has an unknown type because neither the hardware nor the > firmware told us, an entry in the sysfs tree will be made, but the type > file will not be present. lscpu depends on the type file being present > for every entry, and will error out without printing system information > if lscpu cannot open the type file. > > Presenting information about a cache without indicating its type is not > useful, therefore if we hit a cache with an unknown type, stop populating > sysfs so that userspace has the maximum amount of useful information. > > This addresses the following lscpu error, which prevents any output. > lscpu: cannot open /sys/devices/system/cpu/cpu0/cache/index3/type: No such > file or directory > > Suggested-by: Sudeep Holla <sudeep.holla@arm.com> > Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org> > --- > drivers/base/cacheinfo.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c > index 5d5b598..cf78fa6 100644 > --- a/drivers/base/cacheinfo.c > +++ b/drivers/base/cacheinfo.c > @@ -615,6 +615,8 @@ static int cache_add_dev(unsigned int cpu) > this_leaf = this_cpu_ci->info_list + i; > if (this_leaf->disable_sysfs) > continue; > + if (this_leaf->type == CACHE_TYPE_NOCACHE) > + break; > cache_groups = cache_get_attribute_groups(this_leaf); > ci_dev = cpu_device_create(parent, this_leaf, cache_groups, > "index%1u", i); >
Looks fine to me:
Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>
Thanks,
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