linux-kernel - Re: [PATCH 1/1] nospec: Add documentation for array_index

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Message-ID: <ZIykXq2U5XVZ4aB+@casper.infradead.org>
Date:   Fri, 16 Jun 2023 19:05:18 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Jordy Zomer <jordyzomer@...gle.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        corbet@....net, dave.hansen@...ux.intel.com, daniel@...earbox.net,
        tglx@...utronix.de, rdunlap@...radead.org,
        pawan.kumar.gupta@...ux.intel.com
Subject: Re: [PATCH 1/1] nospec: Add documentation for array_index_nospec

On Fri, Jun 16, 2023 at 01:37:35PM +0000, Jordy Zomer wrote:
> +Please note that this function should only be used if the upper
> +boundary is a built-time constant, otherwise this could be
> +speculated on as well. If this is not the case please refer to
> +barrier_nospec().

"build time", not "built time".  Also, "Please note that" doesn't
really add any value.  You can just write:

This function should only be used if the upper boundary is a build-time
constant, otherwise this could be speculated on as well.  If it is not
a constant, use barrier_nospec() instead.