linux-kernel - Re: [PATCH v2 3/7] mm/gup: Fix the outdated code comments above get_user_pages

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Message-ID: <Z+v5/L+xg8y3cY4K@MiWiFi-R3L-srv>
Date: Tue, 1 Apr 2025 22:36:44 +0800
From: Baoquan He <bhe@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, yanjun.zhu@...ux.dev
Subject: Re: [PATCH v2 3/7] mm/gup: Fix the outdated code comments above
 get_user_pages_unlocked()

On 04/01/25 at 10:14am, David Hildenbrand wrote:
> On 31.03.25 10:13, Baoquan He wrote:
> > Since commit f0818f472d8d ("mm: gup: add get_user_pages_locked
> > and get_user_pages_unlocked"), get_user_pages() doesn't need to have
> > mmap_lock held anymore. It calls __get_user_pages_locked() which
> > can acquire and drop the mmap_lock internaly.
> 
> s/internaly/internally/
> 
> But your statement is wrong. get_user_pages() must be called with the
> mmap_lock held, because it sets "int locked = 1;" when calling
> __get_user_pages_locked().

You are right. I missed that line. Oscar pointed that out in v1 thread.
I will drop this patch. Thanks.