Re: [PATCH] iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP

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To: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: Re: [PATCH] iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP
From: Christoph Hellwig <hch@xxxxxx>
Date: Mon, 28 Oct 2024 09:55:06 +0100
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Kent Overstreet <kent.overstreet@xxxxxxxxx>, "Darrick J. Wong" <djwong@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx
In-reply-to: <dd5f0c89-186e-18e1-4f43-19a60f5a9774@google.com>
User-agent: Mutt/1.5.17 (2007-11-01)

On Sun, Oct 27, 2024 at 03:23:23PM -0700, Hugh Dickins wrote:
> generic/077 on x86_32 CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP=y with highmem,
> on huge=always tmpfs, issues a warning and then hangs (interruptibly):

Looks good:

Reviewed-by: Christoph Hellwig <hch@xxxxxx>

References:
- [PATCH] iov_iter: fix copy_page_from_iter_atomic() if KMAP_LOCAL_FORCE_MAP
  - From: Hugh Dickins

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