linux-kernel - Re: [PATCH v3 1/2] drivers: base: cacheinfo: Do not populate sysfs for unknown cache types

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Message-ID: <256435083.TFCBfdESsY@aspire.rjw.lan>
Date:   Wed, 03 Oct 2018 11:35:39 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Jeffrey Hugo <jhugo@...eaurora.org>
Cc:     sudeep.holla@....com, gregkh@...uxfoundation.org,
        linux-acpi@...r.kernel.org, jeremy.linton@....com,
        linux-kernel@...r.kernel.org, vkilari@...eaurora.org
Subject: Re: [PATCH v3 1/2] drivers: base: cacheinfo: Do not populate sysfs for unknown cache types

On Friday, September 28, 2018 4:57:56 AM CEST 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@....com>
> Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
> Reviewed-by: Jeremy Linton <jeremy.linton@....com>
> ---
>  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);
> 

Can you please resend this patch with all tags collected so far?

Patchwork doesn't seem to have picked it up.

Thanks,
Rafael