linux-kernel - Re: [PATCH 0/3] btrfs: Convert kmap/memset/kunmap to memzero

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Message-Id: <20210310155836.7d63604e28d746ef493c1882@linux-foundation.org>
Date:   Wed, 10 Mar 2021 15:58:36 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     ira.weiny@...el.com
Cc:     David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] btrfs: Convert kmap/memset/kunmap to memzero_user()

On Tue,  9 Mar 2021 13:21:34 -0800 ira.weiny@...el.com wrote:

> Previously this was submitted to convert to zero_user()[1].  zero_user() is not
> the same as memzero_user() and in fact some zero_user() calls may be better off
> as memzero_user().  Regardless it was incorrect to convert btrfs to
> zero_user().
> 
> This series corrects this by lifting memzero_user(), converting it to
> kmap_local_page(), and then using it in btrfs.

This impacts btrfs more than MM.  I suggest the btrfs developers grab
it, with my

Acked-by: Andrew Morton <akpm@...ux-foundation.org>