linux-kernel - Re: [PATCH v2 2/2] hexdump: Allow skipping identical lines

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z4TlRNdKtiZM_foH@smile.fi.intel.com>
Date: Mon, 13 Jan 2025 12:04:52 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Miquel Raynal <miquel.raynal@...tlin.com>
Cc: David Laight <david.laight.linux@...il.com>,
	Petr Mladek <pmladek@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Jonathan Corbet <corbet@....net>,
	John Ogness <john.ogness@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] hexdump: Allow skipping identical lines

On Sat, Jan 11, 2025 at 10:54:58AM +0100, Miquel Raynal wrote:
> On 10/01/2025 at 19:39:30 GMT, David Laight <david.laight.linux@...il.com> wrote:
> > On Fri, 10 Jan 2025 19:42:05 +0100
> > Miquel Raynal <miquel.raynal@...tlin.com> wrote:

> >> When dumping long buffers (especially for debug purposes) it may be very
> >> convenient to sometimes avoid spitting all the lines of the buffer if
> >> the lines are identical. Typically on embedded devices, the console
> >> would be wired to a UART running at 115200 bauds, which makes the dumps
> >> very (very) slow. In this case, having a flag to avoid printing
> >> duplicated lines is handy.
> > ... 
> >>  enum {
> >>  	DUMP_FLAG_ASCII,
> >> +	DUMP_FLAG_SKIP_IDENTICAL_LINES,
> >>  };
> > ...
> >> +		if (flags & DUMP_FLAG_SKIP_IDENTICAL_LINES) {
> >
> >
> > That doesn't look right to me.
> > You want:
> > enum {
> > 	DUMP_FLAG_HEX_ONLY = false,
> > 	DUMP_FLAG_ASCII = true,
> > 	DUMP_FLAG_SKIP_IDENTICAL_LINES = BIT(1),
> > };
> >
> > and maybe you can get away with not changing all the other files.
> 
> I'm a bit sad all the time spent on these changes will go to trash :),

Oh, you can imagine my frustration when I contribute and it goes to trash.
I have an experience with that kind of events :-)

> they kind of looked "nicer", but for sure this approach would be
> transparent. I can definitely try that.

-- 
With Best Regards,
Andy Shevchenko