linux-kernel - Re: [RFC 1/2] lib/vsprintf: Add support for pte

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Message-ID: <5d037cb6-91a7-47b7-a902-c3e36f2adefb@arm.com>
Date: Wed, 18 Jun 2025 14:07:05 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: David Hildenbrand <david@...hat.com>, linux-mm@...ck.org
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Rasmus Villemoes <linux@...musvillemoes.dk>,
 Sergey Senozhatsky <senozhatsky@...omium.org>, Petr Mladek
 <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>,
 Jonathan Corbet <corbet@....net>, Andrew Morton <akpm@...ux-foundation.org>,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [RFC 1/2] lib/vsprintf: Add support for pte_t



On 18/06/25 1:48 PM, David Hildenbrand wrote:
> On 18.06.25 06:12, Anshuman Khandual wrote:
>> Add a new format for printing page table entries.
>>
>> Cc: Petr Mladek <pmladek@...e.com>
>> Cc: Steven Rostedt <rostedt@...dmis.org>
>> Cc: Jonathan Corbet <corbet@....net>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: David Hildenbrand <david@...hat.com>
>> Cc: linux-doc@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Cc: linux-mm@...ck.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>>   Documentation/core-api/printk-formats.rst | 14 ++++++++++++++
>>   lib/vsprintf.c                            | 20 ++++++++++++++++++++
>>   mm/memory.c                               |  5 ++---
>>   scripts/checkpatch.pl                     |  2 +-
>>   4 files changed, 37 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core-api/printk-formats.rst
>> index 4b7f3646ec6ce..75a110b059ee1 100644
>> --- a/Documentation/core-api/printk-formats.rst
>> +++ b/Documentation/core-api/printk-formats.rst
>> @@ -689,6 +689,20 @@ Rust
>>   Only intended to be used from Rust code to format ``core::fmt::Arguments``.
>>   Do *not* use it from C.
>>   +Page Table Entry
>> +----------------
>> +
>> +::
>> +        %ppte
>> +
>> +Print standard page table entry pte_t.
>> +
>> +Passed by reference.
> 
> Curious, why the decision to pass by reference?

Just to make this via %p<> based address mechanism. But wondering
will it be better for the pte to be represented via value instead
of reference ?