linux-kernel - Re: [PATCH v4] staging: greybus: Convert uart.c from IDR to XArray

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Message-ID: <YSzMB80NOkNvdjy1@casper.infradead.org>
Date:   Mon, 30 Aug 2021 13:16:07 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        greybus-dev@...ts.linaro.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] staging: greybus: Convert uart.c from IDR to XArray

On Mon, Aug 30, 2021 at 01:52:48PM +0200, Johan Hovold wrote:
> Whether the API is better is debatable. As I said, almost no drivers use
> the new XArray interface, and perhaps partly because the new interface
> isn't as intuitive as has been claimed (e.g. xa_load() instead of
> ida_find()). And IDR/IDA isn't marked/documented as deprecated as far as
> I know.

I can't just slap a 'deprecated' attribute on it.  That'll cause a
storm of warnings.  What would you suggest I do to warn people that
this interface is deprecated and I would like to remove it?

Why do you think that idr_find() is more intuitive than xa_load()?
The 'find' verb means that you search for something.  But it doesn't
search for anything; it just returns the pointer at that index.
'find' should return the next non-NULL pointer at-or-above a given
index.