linux-kernel - [PATCH -next] dt-bindings:i kbuild: Make DT_SCHEMA

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Message-Id: <20220315202032.538911-1-nathan@kernel.org>
Date:   Tue, 15 Mar 2022 13:20:32 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH -next] dt-bindings:i kbuild: Make DT_SCHEMA_LINT a recursive variable

A recent change added a warning when yamllint is not installed, as it is
needed for 'make dt_binding_check'. However, it also changed
DT_SCHEMA_LINT to be a simple make variable, which is evaluated when a
Makefile is evaluated. This causes a warning when running 'make clean',
as Documentation/devicetree/bindings/Makefile has a "clean-files"
variable:

  $ make -s clean
  which: no yamllint in (...)
  warning: python package 'yamllint' not installed, skipping

Make DT_SCHEMA_LINT a recursive variable so it is evaluated only when it
is used. The warning still triggers when 'make dt_binding_check' is run.

Fixes: b3e664a7f449 ("dt-bindings: kbuild: Print a warning if yamllint is not found")
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 Documentation/devicetree/bindings/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/Makefile b/Documentation/devicetree/bindings/Makefile
index e594e5898be0..c9953f86b19d 100644
--- a/Documentation/devicetree/bindings/Makefile
+++ b/Documentation/devicetree/bindings/Makefile
@@ -3,7 +3,7 @@ DT_DOC_CHECKER ?= dt-doc-validate
 DT_EXTRACT_EX ?= dt-extract-example
 DT_MK_SCHEMA ?= dt-mk-schema
 
-DT_SCHEMA_LINT := $(shell which yamllint || \
+DT_SCHEMA_LINT = $(shell which yamllint || \
   echo "warning: python package 'yamllint' not installed, skipping" >&2)
 
 DT_SCHEMA_MIN_VERSION = 2022.3

base-commit: 593adaa6459903728cb59392239f2c615b8dadbb
-- 
2.35.1