linux-kernel - [PATCH] scripts/dtc: dtx_diff: fix documentation for redirect workaround

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Date:   Wed, 12 Jan 2022 11:14:41 +0100
From:   Matthias Schiffer <matthias.schiffer@...tq-group.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: [PATCH] scripts/dtc: dtx_diff: fix documentation for redirect workaround

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.

Change the example to use `diff -u` directly.

Fixes: 10eadc253ddf ("dtc: create tool to diff device trees")
Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
---
 scripts/dtc/dtx_diff | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/dtc/dtx_diff b/scripts/dtc/dtx_diff
index d3422ee15e30..f97eb83420a4 100755
--- a/scripts/dtc/dtx_diff
+++ b/scripts/dtc/dtx_diff
@@ -62,7 +62,7 @@ Otherwise DTx is treated as a dts source file (aka .dts).
    may not work since \${ARCH} is part of the include path.  Two possible
    workarounds:
 
-      `basename $0` \\
+      diff -u \\
           <(ARCH=arch_of_dtx_1 `basename $0` DTx_1) \\
           <(ARCH=arch_of_dtx_2 `basename $0` DTx_2)
 
-- 
2.25.1