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Date:   Wed, 6 Jul 2022 12:07:12 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
Cc:     David Sterba <dsterba@suse.com>, Chris Mason <clm@fb.com>,
        Josef Bacik <josef@toxicpanda.com>,
        Nick Terrell <terrelln@fb.com>, linux-btrfs@vger.kernel.org,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Ira Weiny <ira.weiny@intel.com>,
        Matthew Wilcox <willy@infradead.org>,
        Kees Cook <keescook@chromium.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        "James E. J. Bottomley" <James.Bottomley@HansenPartnership.com>,
        Helge Deller <deller@gmx.de>,
        John David Anglin <dave.anglin@bell.net>,
        linux-parisc@vger.kernel.org, David Sterba <dsterba@suse.cz>
Subject: Re: [PATCH v6 1/2] highmem: Make __kunmap_{local,atomic}() take
 "const void *"
Message-Id: <20220706120712.31b4313f17cb7ae08618c90e@linux-foundation.org>
In-Reply-To: <20220706111520.12858-2-fmdefrancesco@gmail.com>
References: <20220706111520.12858-1-fmdefrancesco@gmail.com>
        <20220706111520.12858-2-fmdefrancesco@gmail.com>
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On Wed,  6 Jul 2022 13:15:19 +0200 "Fabio M. De Francesco" <fmdefrancesco@gmail.com> wrote:

> __kunmap_ {local,atomic}() currently take pointers to void. However, this
> is semantically incorrect, since these functions do not change the memory
> their arguments point to.
> 
> Therefore, make this semantics explicit by modifying the
> __kunmap_{local,atomic}() prototypes to take pointers to const void.
> 
> As a side effect, compilers will likely produce more efficient code.
> 

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

Please include this in the btrfs tree if/when [2/2] is added.