linux-kernel - Re: [PATCH RFC/RFT v2 3/8] s390: move cacheinfo sysfs to generic cacheinfo infrastructure

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Message-ID: <20140210113019.GC19013@osiris>
Date:	Mon, 10 Feb 2014 12:30:19 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org
Subject: Re: [PATCH RFC/RFT v2 3/8] s390: move cacheinfo sysfs to generic
 cacheinfo infrastructure

On Fri, Feb 07, 2014 at 04:49:18PM +0000, Sudeep Holla wrote:
> From: Sudeep Holla <sudeep.holla@....com>
> 
> This patch removes the redundant sysfs cacheinfo code by making use of
> the newly introduced generic cacheinfo infrastructure.
> 
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>

[...]

> -static ssize_t shared_cpu_map_func(struct kobject *kobj, int type, char *buf)
> -{
> -	struct cache_index_dir *index;
> -	int len;
> +	this_leaf->level = level + 1;
> +	this_leaf->type = type;
> +	this_leaf->coherency_line_size = ecag(EXTRACT_LINE_SIZE, level, ti);
> +	this_leaf->ways_of_associativity = ecag(EXTRACT_ASSOCIATIVITY,
> +						level, ti);
> +	this_leaf->size = ecag(EXTRACT_SIZE, level, ti);
> +	if (private)
> +		cpumask_set_cpu(cpu, &this_leaf->shared_cpu_map);
> +	else /* System wide */
> +		cpumask_copy(&this_leaf->shared_cpu_map, cpu_online_mask);

FWIW, this also seems to be wrong: on s390 we only expose cpu private
caches via sysfs. Shared caches are not exposed (and simply saying they are
system wide would be wrong).
Please have a look at these two commits which should describe why things
are as they are on s390:

881730ad365130f64b5c70c40904b04eb3b79de3
 "s390/cache: expose cpu cache topology via sysfs"
6668022c7bde3fdc96d3d257294a7216c7a46829
 "s390/cache: add cpu cache information to /proc/cpuinfo"

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