linux-kernel - Re: [PATCH v7 1/1] gpio: add sloppy logic analyzer using polling

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Date:   Mon, 28 Mar 2022 15:51:31 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v7 1/1] gpio: add sloppy logic analyzer using polling

On Mon, Mar 28, 2022 at 02:19:55PM +0200, Wolfram Sang wrote:
> 
> > > I don't like assigning 'priv' memebers twice, so I'd like to keep it as
> > > is.
> > 
> > But this will give better understanding of the steps the code performs, no?
> 
> IMO the current version is readable :)

OK!

...

> > (Because this function basically contains two steps at once. I assume it's
> >  done this way due to absence of vrealloc(), right?)
> > 
> > But we have kvrealloc(). Can it be used here?
> 
> This has a huge disadvantage: realloc() requests new memory before the
> old one is discarded. If you want to make a huge buffer bigger, this can
> lead to OOM. The old contents do not matter, so the old buffer can go
> away in favor of the new one.

Fair enough.

...

> > > > Can it be wrapped by DEFINE_SHOW_ATTRIBUTE()?
> > > 
> > > I don't see a way. Do you?
> > 
> > Me neither. I mixed this up with (not upstreamed yet) DEFINE_STORE_ATTRIBUTE.
> 
> Still no cigar. That one is for rw files. Mine is writable only, so I use
> e.g. no_llseek.
> 
> Probably, the above macro should be named, DEFINE_SHOWSTORE_ATTRIBUTE.
> But I see this macro is stalled since late 2020 anyhow.

Right, not applicable here anyway.

-- 
With Best Regards,
Andy Shevchenko