linux-kernel - Re: [PATCH v2 2/5] pstore/platform: pass max

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Date:   Wed, 6 May 2020 10:31:59 -0400
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Kees Cook <keescook@...omium.org>,
        James Morris <jmorris@...ei.org>,
        Sasha Levin <sashal@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        anton@...msg.org, ccross@...roid.com,
        Tony Luck <tony.luck@...el.com>, robh+dt@...nel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/5] pstore/platform: pass max_reason to kmesg dump

On Wed, May 6, 2020 at 9:52 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Tue, 5 May 2020 14:59:37 -0700
> Kees Cook <keescook@...omium.org> wrote:
>
> > > @@ -97,6 +97,8 @@ struct pstore_record {
> > >   * @read_mutex:    serializes @open, @read, @close, and @erase callbacks
> > >   * @flags: bitfield of frontends the backend can accept writes for
> > >   * @data:  backend-private pointer passed back during callbacks
> > > + * @max_reason: Used when PSTORE_FLAGS_DMESG is set. Contains the
> > > + *              kmsg_dump_reason enum value.
> >
> > Nit: please move this above @data since it has a @flags dependency.
> >
> > >   *
> > >   * Callbacks:
> > >   *
> > > @@ -180,6 +182,7 @@ struct pstore_info {
> > >
> > >     int             flags;
> > >     void            *data;
> > > +   int             max_reason;
>
> Not to mention that moving max_reason above data will fill in the hole left
> by a 32 bit int, followed by a 64 bit pointer.

Good point. I will do it in the next version.

Thank you,
Pasha

>
> -- Steve
>
>
> > >
> > >     int             (*open)(struct pstore_info *psi);
> > >     int             (*close)(struct pstore_info *psi);