linux-kernel - Re: [PATCH RFC 1/3] drivers: base: support cpu cache information interface to userspace via sysfs

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Date:	Thu, 09 Jan 2014 19:07:39 +0000
From:	Sudeep Holla <Sudeep.Holla@....com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Sudeep.Holla@....com, "x86@...nel.org" <x86@...nel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ashok Raj <ashok.raj@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rob Herring <robh@...nel.org>
Subject: Re: [PATCH RFC 1/3] drivers: base: support cpu cache information
 interface to userspace via sysfs

On 08/01/14 20:26, Greg Kroah-Hartman wrote:
> On Wed, Jan 08, 2014 at 07:26:06PM +0000, Sudeep Holla wrote:
>> From: Sudeep Holla <sudeep.holla@....com>
>>
>> This patch adds initial support for providing processor cache information
>> to userspace through sysfs interface. This is based on x86 implementation
>> and hence the interface is intended to be fully compatible.
>>
>> A per-cpu array of cache information maintained is used mainly for
>> sysfs-related book keeping.
>>
>> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
>> ---
>>  drivers/base/Makefile     |   2 +-
>>  drivers/base/cacheinfo.c  | 296 ++++++++++++++++++++++++++++++++++++++++++++++
>>  include/linux/cacheinfo.h |  43 +++++++
>>  3 files changed, 340 insertions(+), 1 deletion(-)
>>  create mode 100644 drivers/base/cacheinfo.c
>>  create mode 100644 include/linux/cacheinfo.h
> 
> You are creating sysfs files, yet you didn't add Documentation/ABI/
> information, which is required.  Please fix that.
> 
Ah, I overlooked it. But I am not creating any new sysfs files in this series.
I am just trying to unify duplicated code in various architectures.

Since these sysfs files are already created in:
1. arch/ia64/kernel/topology.c
2. arch/powerpc/kernel/cacheinfo.c
3. arch/s390/kernel/cache.c
4. arch/x86/kernel/cpu/intel_cacheinfo.c and
also already used by user-space tools like `lscpu` I assumed it's already
documented.

I will add it in next version.

Regards,
Sudeep

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