linux-kernel - RE: [PATCH v4 2/4] topology: use bin

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Date:   Thu, 17 Jun 2021 11:03:40 +0000
From:   "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux@...musvillemoes.dk" <linux@...musvillemoes.dk>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "agordeev@...ux.ibm.com" <agordeev@...ux.ibm.com>,
        "sbrivio@...hat.com" <sbrivio@...hat.com>,
        "jianpeng.ma@...el.com" <jianpeng.ma@...el.com>,
        "yury.norov@...il.com" <yury.norov@...il.com>,
        "valentin.schneider@....com" <valentin.schneider@....com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "bristot@...hat.com" <bristot@...hat.com>,
        "guodong.xu@...aro.org" <guodong.xu@...aro.org>,
        tangchengchang <tangchengchang@...wei.com>,
        "Zengtao (B)" <prime.zeng@...ilicon.com>,
        yangyicong <yangyicong@...wei.com>,
        "tim.c.chen@...ux.intel.com" <tim.c.chen@...ux.intel.com>,
        "tiantao (H)" <tiantao6@...ilicon.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Linuxarm <linuxarm@...wei.com>
Subject: RE: [PATCH v4 2/4] topology: use bin_attribute to avoid buff overflow



> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Thursday, June 17, 2021 10:56 PM
> To: Song Bao Hua (Barry Song) <song.bao.hua@...ilicon.com>
> Cc: andriy.shevchenko@...ux.intel.com; linux-kernel@...r.kernel.org;
> linux@...musvillemoes.dk; rafael@...nel.org; akpm@...ux-foundation.org;
> rdunlap@...radead.org; agordeev@...ux.ibm.com; sbrivio@...hat.com;
> jianpeng.ma@...el.com; yury.norov@...il.com; valentin.schneider@....com;
> peterz@...radead.org; bristot@...hat.com; guodong.xu@...aro.org;
> tangchengchang <tangchengchang@...wei.com>; Zengtao (B)
> <prime.zeng@...ilicon.com>; yangyicong <yangyicong@...wei.com>;
> tim.c.chen@...ux.intel.com; tiantao (H) <tiantao6@...ilicon.com>; Jonathan
> Cameron <jonathan.cameron@...wei.com>; Linuxarm <linuxarm@...wei.com>
> Subject: Re: [PATCH v4 2/4] topology: use bin_attribute to avoid buff overflow
> 
> On Thu, Jun 17, 2021 at 10:19:08PM +1200, Barry Song wrote:
> > From: Tian Tao <tiantao6@...ilicon.com>
> >
> > Reading sys/devices/system/cpu/cpuX/topology/ returns cpu topology.
> > However, the size of this file is limited to PAGE_SIZE because of the
> > limitation for sysfs attribute. so we use bin_attribute instead of
> > attribute to avoid NR_CPUS too big to cause buff overflow.
> >
> > Link:
> https://lore.kernel.org/lkml/20210319041618.14316-2-song.bao.hua@hisilicon
> .com/
> > Signed-off-by: Tian Tao <tiantao6@...ilicon.com>
> > Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> 
> As with the other patch, you have to also sign off on this as well.
> 
Ok. Will add my s-o-b for patch 1-3.

> The link is pointing to a v5 of a different patch series, why put that
> here?

This patchset originated from the discussion of that one in the
link tag.

Jonathan and me were trying to add a cluster topology level.
And that one exposed the problem this patchset is addressing.

> 
> thanks,
> 
> greg k-h

Thanks
Barry