linux-kernel - Re: [PATCH v4 0/3] Avoid live-lock in btrfs fault-in+uaccess loop

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Message-Id: <165090314404.2743611.7102822933741144292.b4-ty@arm.com>
Date:   Mon, 25 Apr 2022 17:13:47 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Will Deacon <will@...nel.org>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        David Sterba <dsterba@...e.com>, linux-kernel@...r.kernel.org,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v4 0/3] Avoid live-lock in btrfs fault-in+uaccess loop

On Sat, 23 Apr 2022 11:07:48 +0100, Catalin Marinas wrote:
> A minor update from v3 here:
> 
> https://lore.kernel.org/r/20220406180922.1522433-1-catalin.marinas@arm.com
> 
> In patch 3/3 I dropped the 'len' local variable, so the btrfs patch
> simply replaces fault_in_writeable() with fault_in_subpage_writeable()
> and adds a comment. I kept David's ack as there's no functional change
> since v3.
> 
> [...]

Applied to arm64 (for-next/fault-in-subpage). Also changed the
probe_subpage_writeable() prototype to use char __user * instead of void
__user * (as per Andrew's suggestion).

[1/3] mm: Add fault_in_subpage_writeable() to probe at sub-page granularity
      https://git.kernel.org/arm64/c/da32b5817253
[2/3] arm64: Add support for user sub-page fault probing
      https://git.kernel.org/arm64/c/f3ba50a7a100
[3/3] btrfs: Avoid live-lock in search_ioctl() on hardware with sub-page faults
      https://git.kernel.org/arm64/c/18788e34642e

-- 
Catalin