linux-kernel - Re: [Bug report] hash_name() may cross page boundary and trigger sleep in RCU context

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Message-ID: <CAHk-=wg4ZnsfpgXYL5qhjYDYo1Gnssz+VxnKZzHXMEmE7qrnQQ@mail.gmail.com>
Date: Tue, 2 Dec 2025 14:07:25 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Zizhi Wo <wozizhi@...weicloud.com>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, jack@...e.com, brauner@...nel.org, hch@....de, 
	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	linux-arm-kernel@...ts.infradead.org, yangerkun@...wei.com, 
	wangkefeng.wang@...wei.com, pangliyuan1@...wei.com, xieyuanbin1@...wei.com
Subject: Re: [Bug report] hash_name() may cross page boundary and trigger
 sleep in RCU context

On Tue, 2 Dec 2025 at 04:43, Russell King (Oracle)
<linux@...linux.org.uk> wrote:
>
> What I'm thinking is to address both of these by handling kernel space
> page faults (which will be permission or PTE-not-present) separately
> (not even build tested):

That patch looks sane to me.

But I also didn't build test it, just scanned it visually ;)

            Linus