linux-kernel - [PATCH 5.4 101/152] kbuild: fix DT binding schema rule to detect command line changes

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Date:   Tue,  3 Mar 2020 18:43:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masahiro Yamada <masahiroy@...nel.org>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 5.4 101/152] kbuild: fix DT binding schema rule to detect command line changes

From: Masahiro Yamada <masahiroy@...nel.org>

commit 7a04960560640ac5b0b89461f7757322b57d0c7a upstream.

This if_change_rule is not working properly; it cannot detect any
command line change.

The reason is because cmd-check in scripts/Kbuild.include compares
$(cmd_$@) and $(cmd_$1), but cmd_dtc_dt_yaml does not exist here.

For if_change_rule to work properly, the stem part of cmd_* and rule_*
must match. Because this cmd_and_fixdep invokes cmd_dtc, this rule must
be named rule_dtc.

Fixes: 4f0e3a57d6eb ("kbuild: Add support for DT binding schema checks")
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Acked-by: Rob Herring <robh@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 scripts/Makefile.lib |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -305,13 +305,13 @@ DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING
 quiet_cmd_dtb_check =	CHECK   $@
       cmd_dtb_check =	$(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ;
 
-define rule_dtc_dt_yaml
+define rule_dtc
 	$(call cmd_and_fixdep,dtc,yaml)
 	$(call cmd,dtb_check)
 endef
 
 $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
-	$(call if_changed_rule,dtc_dt_yaml)
+	$(call if_changed_rule,dtc)
 
 dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)