linux-kernel - Re: [PATCH 2/2] [RFC] pagemap.rst: Document write bit

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Date: Thu, 7 Mar 2024 12:10:57 +0100 (CET)
From: Richard Weinberger <richard@....at>
To: David Hildenbrand <david@...hat.com>
Cc: linux-mm <linux-mm@...ck.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	Linux Doc Mailing List <linux-doc@...r.kernel.org>, 
	upstream+pagemap@...ma-star.at, adobriyan@...il.com, 
	wangkefeng wang <wangkefeng.wang@...wei.com>, 
	ryan roberts <ryan.roberts@....com>, hughd@...gle.com, 
	peterx@...hat.com, avagin@...gle.com, lstoakes@...il.com, 
	vbabka <vbabka@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, 
	usama anjum <usama.anjum@...labora.com>, 
	Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 2/2] [RFC] pagemap.rst: Document write bit

----- Ursprüngliche Mail -----
> Von: "David Hildenbrand" <david@...hat.com>
> An: "richard" <richard@....at>, "linux-mm" <linux-mm@...ck.org>
>> +   Bit 58 is useful to detect CoW mappings; however, it does not indicate
>> +   whether the page mapping is writable or not. If an anonymous mapping is
>> +   writable but the write bit is not set, it means that the next write access
>> +   will cause a page fault, and copy-on-write will happen.
> 
> That is not true.

Can you please help me correct my obvious misunderstanding?