linux-kernel - Re: [PATCH v2 0/4] printf: Add struct range print specifier

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Message-ID: <6723f7e664470_7b1f129430@iweiny-mobl.notmuch>
Date: Thu, 31 Oct 2024 16:34:30 -0500
From: Ira Weiny <ira.weiny@...el.com>
To: metux <metux@....de>, Ira Weiny <ira.weiny@...el.com>, Andrew Morton
	<akpm@...ux-foundation.org>, Petr Mladek <pmladek@...e.com>, Steven Rostedt
	<rostedt@...dmis.org>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>, Sergey Senozhatsky
	<senozhatsky@...omium.org>, Jonathan Corbet <corbet@....net>, Davidlohr Bueso
	<dave@...olabs.net>, Jonathan Cameron <jonathan.cameron@...wei.com>, "Dave
 Jiang" <dave.jiang@...el.com>, Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>, Dan Williams
	<dan.j.williams@...el.com>
CC: Fan Ni <fan.ni@...sung.com>, Bagas Sanjaya <bagasdotme@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] printf: Add struct range print specifier

metux wrote:
> On 26.10.24 02:46, Ira Weiny wrote:
> > Support for the Compute Express Link (CXL) Dynamic Capacity Devices
> > (DCD) have grown a number of uses to print struct range.[1]  Support for
> > a printf specifier '%pra' was being worked within a large series and has
> > garnered a number of comments and discussion.
> 
> This is just printing out hex dump of a memory range, correct ?

No.  This prints the struct range values not the data.

> 
> What I'm looking for quite some time is a sane way for dumping structs
> in a human readable form (field: value pairs, using their actual types
> eg. int vs string, ...).
>
> Any idea to do that in a generic way ?
> (potentially using debug info ?)
> 

For printing buffers less than 64 bytes look at:[1]

 %*ph

or bigger buffers

print_hex_dump()

Ira

[1] https://www.kernel.org/doc/html/latest/core-api/printk-formats.html