linux-kernel - Re: [RFC PATCH] vfs: Fix might sleep in load_unaligned

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Message-ID: <aSdPYYqPD5V7Yeh6@shell.armlinux.org.uk>
Date: Wed, 26 Nov 2025 19:05:05 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: Xie Yuanbin <xieyuanbin1@...wei.com>, brauner@...nel.org, jack@...e.cz,
	will@...nel.org, nico@...xnic.net, akpm@...ux-foundation.org,
	hch@....de, jack@...e.com, wozizhi@...weicloud.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
	lilinjie8@...wei.com, liaohua4@...wei.com,
	wangkefeng.wang@...wei.com, pangliyuan1@...wei.com
Subject: Re: [RFC PATCH] vfs: Fix might sleep in load_unaligned_zeropad()
 with rcu read lock held

On Wed, Nov 26, 2025 at 06:48:20PM +0000, Al Viro wrote:
> It's been years since I looked at 32bit arm exception handling, so I'd need
> quite a bit of (re)RTF{S,M} before I'm comfortable with poking in
> arch/arm/mm/fault.c; better let ARM folks deal with that.  But arch/* is
> where it should be dealt with; as for papering over that in fs/*:

Don't expect that to happen. I've not looked at it for over a decade,
I do very little 32-bit ARM stuff anymore. Others have modified the
fault handling, the VM has changed, I basically no longer have the
knowledge. Effectively, 32-bit ARM is unmaintained now, although it
still has many users.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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