linux-kernel - Re: [PATCH v2] scripts/dtc: dtx_diff: remove broken example from help text

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Message-ID: <YeGWDoobNrjiSEXd@robh.at.kernel.org>
Date:   Fri, 14 Jan 2022 09:26:06 -0600
From:   Rob Herring <robh@...nel.org>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc:     Frank Rowand <frowand.list@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scripts/dtc: dtx_diff: remove broken example from
 help text

On Thu, Jan 13, 2022 at 09:19:18AM +0100, Matthias Schiffer wrote:
> dtx_diff suggests to use <(...) syntax to pipe two inputs into it, but
> this has never worked: The /proc/self/fds/... paths passed by the shell
> will fail the `[ -f "${dtx}" ] && [ -r "${dtx}" ]` check in compile_to_dts,
> but even with this check removed, the function cannot work: hexdump will
> eat up the DTB magic, making the subsequent dtc call fail, as a pipe
> cannot be rewound.
> 
> Simply remove this broken example, as there is already an alternative one
> that works fine.
> 
> Fixes: 10eadc253ddf ("dtc: create tool to diff device trees")
> Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> ---
>  scripts/dtc/dtx_diff | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)

Applied, thanks.

Rob