linux-kernel - Re: [PATCH 2/3] xen netback: add fault injection facility

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Date:   Fri, 20 Apr 2018 15:00:28 +0200
From:   Juergen Gross <jgross@...e.com>
To:     staskins@...zon.com
Cc:     jakub.kicinski@...ronome.com, hpa@...or.com, mcroce@...hat.com,
        tglx@...utronix.de, ggarcia@...a.uab.cat, daniel@...earbox.net,
        x86@...nel.org, mingo@...hat.com, xen-devel@...ts.xenproject.org,
        axboe@...nel.dk, konrad.wilk@...cle.com, amir.jer.levy@...el.com,
        paul.durrant@...rix.com, stefanha@...hat.com,
        dsa@...ulusnetworks.com, boris.ostrovsky@...cle.com,
        linux-block@...r.kernel.org, wei.liu2@...rix.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, dwmw@...zon.co.uk, roger.pau@...rix.com
Subject: Re: [PATCH 2/3] xen netback: add fault injection facility

On 20/04/18 14:52, staskins@...zon.com wrote:
> On 04/20/18 13:25, Juergen Gross wrote:
>> On 20/04/18 12:47, Stanislav Kinsburskii wrote:
>>> +    for (fi = 0; fi < XENVIF_FI_MAX; fi++) {
>>> +        vfi->faults[fi] = xen_fi_dir_add(vfi->dir,
>>> +                xenvif_fi_names[fi]);
>> How does this work? xenvif_fi_names[] is an empty array and this is the
>> only reference to it. Who is allocating the memory for that array?
> 
> Well, it works in the way one adds a var to enum (which is used as a key
> later) and a corresponding string into the array (which is used as a
> name for the fault directory in sysfs).

Then you should size the array via XENVIF_FI_MAX.


Juergen