From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeffrey Hugo Subject: [PATCH v4 1/2] drivers: base: cacheinfo: Do not populate sysfs for unknown cache types Date: Thu, 4 Oct 2018 09:20:05 -0600 Message-ID: <1538666406-7504-2-git-send-email-jhugo@codeaurora.org> References: <1538666406-7504-1-git-send-email-jhugo@codeaurora.org> Return-path: In-Reply-To: <1538666406-7504-1-git-send-email-jhugo@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: sudeep.holla@arm.com, gregkh@linuxfoundation.org, rjw@rjwysocki.net, linux-acpi@vger.kernel.org, jeremy.linton@arm.com Cc: linux-kernel@vger.kernel.org, vkilari@codeaurora.org, Jeffrey Hugo List-Id: linux-acpi@vger.kernel.org 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 Signed-off-by: Jeffrey Hugo Reviewed-by: Jeremy Linton Reviewed-by: Sudeep Holla --- 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); -- Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.