linux-kernel - Re: [PATCH 1/2] [v2] lib/hexdump: introduce DUMP_PREFIX

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Message-ID: <CAHp75Vdk6y8dGNJOswZwfOeva_sqVcw-f=yYgf_rptjHXxfZvw@mail.gmail.com>
Date:   Mon, 18 Jan 2021 12:03:08 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Timur Tabi <timur@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>, roman.fietze@...na.com,
        Kees Cook <keescook@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        linux-mm <linux-mm@...ck.org>,
        Akinobu Mita <akinobu.mita@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vaibhav Jain <vaibhav@...ux.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 1/2] [v2] lib/hexdump: introduce DUMP_PREFIX_UNHASHED for
 unhashed addresses

On Sun, Jan 17, 2021 at 12:12 AM Timur Tabi <timur@...nel.org> wrote:

(Hint: -v<n> to the git format-patch will create a versioned subject
prefix for you automatically)

> Hashed addresses are useless in hexdumps unless you're comparing
> with other hashed addresses, which is unlikely.  However, there's
> no need to break existing code, so introduce a new prefix type
> that prints unhashed addresses.

Any user of this? (For the record, I don't see any other mail except this one)

...

>  enum {
>         DUMP_PREFIX_NONE,
>         DUMP_PREFIX_ADDRESS,
> -       DUMP_PREFIX_OFFSET
> +       DUMP_PREFIX_OFFSET,
> +       DUMP_PREFIX_UNHASHED,

Since it's an address, I would like to group them together, i.e. put
after DUMP_PREFIX_ADDRESS.
Perhaps even add _ADDRESS to DUMP_PREFIX_UNHASHED, but this maybe too long.

>  };

...

> + * @prefix_type: controls whether prefix of an offset, hashed address,
> + *  unhashed address, or none is printed (%DUMP_PREFIX_OFFSET,
> + *  %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_UNHASHED, %DUMP_PREFIX_NONE)

Yeah, exactly, here you use different ordering.

...

> + * @prefix_type: controls whether prefix of an offset, hashed address,
> + *  unhashed address, or none is printed (%DUMP_PREFIX_OFFSET,
> + *  %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_UNHASHED, %DUMP_PREFIX_NONE)

In both cases I would rather use colon and list one per line. What do you think?

...

> +               case DUMP_PREFIX_UNHASHED:

Here is a third type of ordering, can you please be consistent?

>                 case DUMP_PREFIX_ADDRESS:

...

> + * @prefix_type: controls whether prefix of an offset, hashed address,
> + *  unhashed address, or none is printed (%DUMP_PREFIX_OFFSET,
> + *  %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_UNHASHED, %DUMP_PREFIX_NONE)

As above.

...

> +               case DUMP_PREFIX_UNHASHED:

As above.

>                 case DUMP_PREFIX_ADDRESS:


-- 
With Best Regards,
Andy Shevchenko