linux-kernel - [PATCH v2 1/4] kbuild: Move dtc graph_child

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Date:   Wed, 22 Nov 2023 15:12:32 -0700
From:   Rob Herring <robh@...nel.org>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Conor Dooley <conor@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: [PATCH v2 1/4] kbuild: Move dtc graph_child_address warning to W=2

There are cases where having a single child node with a unit-address is
valid. For example, other child nodes may be optional or added via a
DT overlay. This hasn't mattered until now, but as platforms become
free of W=1 warnings, we want to enable W=1 by default on a per
platform basis. So move the warning to W=2.

In the process, the logic can be reworked a bit to avoid specifying a
given warning in multiple places.

Signed-off-by: Rob Herring <robh@...nel.org>
---
 scripts/Makefile.lib | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 68d0134bdbf9..a67f781ae8ee 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -340,8 +340,6 @@ quiet_cmd_gzip = GZIP    $@
 # DTC
 # ---------------------------------------------------------------------------
 DTC ?= $(objtree)/scripts/dtc/dtc
-DTC_FLAGS += -Wno-interrupt_provider \
-	-Wno-unique_unit_address
 
 # Disable noisy checks by default
 ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
@@ -357,9 +355,11 @@ endif
 
 ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
 DTC_FLAGS += -Wnode_name_chars_strict \
-	-Wproperty_name_chars_strict \
-	-Winterrupt_provider \
-	-Wunique_unit_address
+	-Wproperty_name_chars_strict
+else
+DTC_FLAGS += -Wno-interrupt_provider \
+	-Wno-unique_unit_address \
+	-Wno-graph_child_address
 endif
 
 DTC_FLAGS += $(DTC_FLAGS_$(basetarget))

-- 
2.42.0