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

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Date:   Thu, 13 Jan 2022 11:09:40 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scripts/dtc: dtx_diff: remove broken example from help
 text

On 1/13/22 2:19 AM, 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(-)
> 
> diff --git a/scripts/dtc/dtx_diff b/scripts/dtc/dtx_diff
> index d3422ee15e30..f2bbde4bba86 100755
> --- a/scripts/dtc/dtx_diff
> +++ b/scripts/dtc/dtx_diff
> @@ -59,12 +59,8 @@ Otherwise DTx is treated as a dts source file (aka .dts).
>     or '/include/' to be processed.
>  
>     If DTx_1 and DTx_2 are in different architectures, then this script
> -   may not work since \${ARCH} is part of the include path.  Two possible
> -   workarounds:
> -
> -      `basename $0` \\
> -          <(ARCH=arch_of_dtx_1 `basename $0` DTx_1) \\
> -          <(ARCH=arch_of_dtx_2 `basename $0` DTx_2)
> +   may not work since \${ARCH} is part of the include path.  The following
> +   workaround can be used:
>  
>        `basename $0` ARCH=arch_of_dtx_1 DTx_1 >tmp_dtx_1.dts
>        `basename $0` ARCH=arch_of_dtx_2 DTx_2 >tmp_dtx_2.dts
>
Reviewed-by: Frank Rowand <frank.rowand@...y.com>